Ii Ii and It's What Goes Into Hpm Speakers That Makes Them Sound Great on Every Part of the Music

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KILL INTERFER WITH TWO ANTENNAS

ToNEAR GEomETa AND CARTRIDGE SETUP DEMYSTIFIED

THE IMPORTANCE OF EAG RAI'4G

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1147425II II AND IT'S WHAT GOES INTO HPM SPEAKERS THAT MAKES THEM SOUND GREAT ON EVERY PART OF THE MUSIC.

H PM 100 Most speaker companies try to impress with the same materials that were being you by describing the "wonderful" sound used in 1945. that comes out of their speakers. Every woofer in the HPM series, At Pioneer, we think the most believable however, is made with a special carbon fiber way to describe how good HPM speakers blend that's allowed us to decrease the are is to tell you what went into them. weight of the cone, yet increase the strength THE HPM SUPERTWEETER: needed for clarity. So you'll hear the deepest SPEAKER TECHNOLOGY RISES TO NEW HIGHS. notes exactly the way the musician recorded In many speakers, you'll them. find that the upper end of the And because every HPM audio spectrum is reproduced woofer also has an oversized by an ordinary tweeter. magnet and long throw voice In HPM speakers, you'll coil, they can handle more find that the high frequencies power without distorting. are reproduced by a unique OTHER FEATURES YOU supertweeter. RARELY HEAROF. It works by using a The High Polymer Máiecula- Super.wee'cr. Every HPM speaker has single piece of High So incredible, we named a whole line of speakers after it. cast aluminum frames, in-

Polymer Molecular film, ( hence the name stead of the usual flimsy stamped out metal HPM) that converts electrical impulses into kind. So that even when you push our sound waves without a magnet, speakers to their limit, you only voice coil, cone, or dome. hear the music and never the And because the HPM frames. In fact, our competitors supertweeter doesn't need were so impressed, they any of these mechanical parts, started making what look like it can reproduce highs die cast frames, but aren't. with an accuracy and HPM speaker cabinets definition that surpasses are made of specially com- even the finest conventional pressed board that has better tweeter. acoustic properties than ordi- As an added advantage, nary wood. the HPM film is for You' `never hear a sound outof"these Their speakers have level curved die cast aluminum speaker maximum sound dispersion. crames. controls that let you adjust So unlike other speakers, you don't have to the sound of the music to your living room. plant yourself in front of an HPM speaker to And these features are not just found in enjoy all the sound it can produce. our most expensive HPM speaker, MID -RANGE THAT ISN'T but in every speaker in the MUDDLED. HPM series. For years, speaker man- All of which begins to ex- ufacturers have labored over plain why, unlike speakers mid -range driver cones that that sound great on only part are light enough to give you Level controls that let you adjust of the music, HPM speakers quick response, yet rigid enough to your listening area. sound great on all of it. not to distort. At this point, we suggest you take your Pioneer solved this problem by creating favorite record into any Pioneer Dealer and special cones that handle more power, and audition a pair of HPM speakers in person. combine lower mass with greater rigidity. So If you think what went into them our HPM drivers provide you with cleaner, sounds impressive, wait till you hear what and crisper mid -range. Which means you'll comes out of them. hear music, and not distortion. (4D PIONEER' WOOFERS THAT TOP EVERY OTHER BOTTOM. We bring it back alive. Conventional woofers are still made

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WHAT dOMES OUT FASPEAKERIS ONLY AS IMPRESSIVE AS WHAT GOES INTO IT.

Enter No. 33 on Reader Service Card Vol. 64, No. 1 DISCWASHER January 1980 presents The Clean Truth About Your

Naked Stylus "Successor to RAW , Est. 1917"

When your stylus plays over one Feature Articles light fingerprint or one tiny "bead" of vinyl stabilizer, the clean naked dia- Annual Equipment Directory & mond becomes a glazed, dust -holding Car Stereo Addenda 32 abrasive weapon wearing away at your Directory "Just Call Me Maestro" 48 Bert Whyte records and masking their true sound. m++ The Importance of This unseen build-up may actually hold Dynamic Range 52 Jerome E. Ruzicka the tracking tip of the diamond out of Kill FM Interference with the record groove. Two Antennas 68 Richard Modafferi Tonearm Geometry and Setup Demystified 76 Martin D. Kessler and Accumulated grit B. V. Pisha on stylus that looks "clean" to the naked eye. Equipment Profiles

The SC -1 Stylus Cleaner from Mitsubishi Micros Discwasher is designed with a brush M -F01 Tuner, M -P01 Preamp, that is stiff enough to remove harmful and M -A01 Amplifier 90 Leonard Feldman accumulation, but gentle enough to Pioneer PL -630 Turntable 98 George W. Tillett avoid damaging delicate cartridge as- DB Systems DB -6 Basic Amplifier 102 Leonard Feldman semblies. Two drops of Discwasher's Sherwood S-32CP FM/AM Tuner 106 Leonard Feldman D3 Fluid add extra cleaning action to the SC -1 without the side -effects of Record Reviews alcohol, which can harden rubber cantilever mountings. The Column 110 Michael Tearson & Jon Tiven Jazz & Blues 114 John Diliberto & After cleaning with SC -1 and D3 John Lissner Fluid by Classical Reviews 116 Edward Tatnall Canby Discwasher. The Folk Bag 118 Tom Bingham

The retractable, walnut -handled Audio in General

SC -1 includes a magnifying mirror for convenient inspection of stylus/car- Tape Guide 6 Herman Burstein tridge alignment and wiring. Video Scenes 8 Bert Whyte Get the clean truth from your Audio ETC 16 Edward Tatnall Canby records; get the SC -1. Behind The Scenes 22 Bert Whyte Audioclinic 26 Joseph Giovanelli What's New in Audio 28 SC -1 STYLUS Dear Editor/Errata 30 Classified Advertising 120 CLEANER Advertising Index 130

About the Cover. These days, tuner circuit design is a high art, which pushes the limits of the medium, as is symbolized by our impressionist cover photo by Photographic Illustrations, Phila- delphia; model, Sue Greco.

ddiscwasher® inc. IMF 1407 N. Providence Rd. Audio Publishing, Editorial, Subscription, and Advertising Production offices, North American Columbia, MO 65201 Building, 401 No. Broad St., Philadelphia, Penna. 19108. Telephone: 215/574-9600. Postmaster: Send Form 3579 to above address. A Great New Sound From Stanton - The Choice of The Professionals Now the great performance enjoyed by recording professionals worldwide in the Stanton 881S cartridge is also available in a brand new, lightweight headphone...the Stanton Dynaphase 55. Professional quality sound is the result of superior Stanton driver design that includes 11/2" dynamic high velocity elements with a specially formulated synthetic film diaphragm and samarium cobalt magnets...allowing for low distortion and exceptionally wide frequency bandwidth. The tuning of the air cavity behind the diaphragm is a unique design of Dynaphase 55. It keeps the air in phase delivering flattest response and finest acoustical behavior of the driving element. Includes adapter plug. Suggested retail *$60 Pictured to the right, is the Stanton Dynaphase 35, a headphone offering top performance at its price. With an adapter plug. *$45 The top -of -the -line Stereo Wafer Model XXI is as fine as they come and featherlight for comfort. *$70 For further information, contact Stanton Magnetics, 200 Terminal STNTOfl Drive, Plainview, N.Y. 11803. THE CHOICE OF 1HE PROFESSIONAL`, ' (t 1979 STANTON MAGNETICS

Enter No. 46 on Reader Service Card At moving coil Audio last a Editor Eugene Pitts Ill cartridge you can Assistant Editor Kay Blumenthal Design Frank Moore recommend to Design Assistants Barbara D'Aprile, Mark Collins Production Manager your best Margaret Zibelman Associate Editors: Edward Tatnall Canby, Bert Whyte friend! Senior Editors: Richard C. Heyser, B. V. Pisha Howard A. Roberson

Contributing Editors/Artists: New AT3OE Tom Bingham, Herman Burstein, Ted Costa, John Diliberto, Stereo Phono Cartridge Leonard Feldman, Joseph Giovanelli, with Vector-AlignedTM Edward M. Long, C. G. McProud, Gary Roseman, Jon Sank, Dual Moving MicroCoilsTM Donald Spoto, Gary Stock, and user -replaceable Stylus Michael Tearson, George W. Tillett, Jon Tiven The subtle, yet unique characteristics of mov- throughout the audio range. Compliance is Vice President/Publisher ing coil cartridges have had their admirers for individually controlled during manufacture years. A top-quality moving coil cartridge ex- of each assembly to optimize performance. Jay L. Butler with most other hibits remarkable sonic clarity and trans- This extra step, impossible M 4y., parency. This performance can be attributed designs, coupled with our unique radial to the very low mass, and low inductance of damping ring, insures excellent tracking of gzMF..-i AUDIO is published monthly by 43 F W"s North American Publishing modulation found in many of a' Company, the tiny coils used to sense the stylus motion. the high-energy 4Z,Zeler Irvin I. Borowsky, Founder and President But until now, moving coil cartridge popu- the top-quality recordings now available. Frank L. Nemeyer, Vice President/General Manager larity has been limited by three major prob - Each coil is located in the ideal geometric Jerome W. Lerman, Vice President/Finance almost inherent to moving relationship to reproduce "its" side of the Joseph Florentine, Chief Financial Officer 4 lems which seemed R. Kenneth Baxter, Vice President/Manufacturing coil designs. record groove. This Vector -Aligned*" design Vijay Chowdhry, Production Director 1) It seemed impossible to make a user - assures excellent stereo separation, minimum Jack Maxson, Promotion Director replaceable stylus assembly without com- moving mass, and the highest possible effi- Betty Brodsky, Subscription Promotion Director which is S. O. (Shap) Shapiro, Circulation Consultant promising performance; 2) most moving coil ciency. It's a design concept Jean Davis, Circulation Manager cartridges exhibited relatively low tracking exclusive to Audio-Technica, and is a major Dorothy Yockey, Subscription Fulfillment Manager ability due to rather stiff cantilever mounting contributor to the outstanding performance ADVERTISING SALES systems; and 3) output of the cartridge was of the AT30E. lay L. Butler, Vice President/Publisher, level needed for commonly avail- We can't take credit for solving the low 545 Madison Ave., New York, NY 10022 below the Telephone (212) 371-4100 able amplifier inputs. output problem. The AT3OE output is simi- AT3OE lar to many other fine moving coil cartridges. East Coast Sales Office: Jay L. Butler, Vice President/ Introducing the new Audio-Technica Publisher, 545 Madison Ave., New York, N.Y. 10022. and the end to all three problems ! Our design But an increasing number of amplifiers Telephone (212) 371-4100. featuring built-in "pre - approach is simple and direct. Rather than and receivers are West Coast Sales Office lay Martin, 17(X)0 Ventura locate the coils in the cartridge body, they preamplifiers" or "head amplifiers" to Blvd., Encino, CA 91316. Telephone (213) 788-9900. are integral with the stylus accommodate moving coil Classified Advertising: Carolynn Sumner, assembly. If the stylus be- cartridges directly. Thus the 401 North Broad St., Philadelphia, Pa 19108 comes worn or damaged, the new systems buyer can make Telephone (215) 574-9600 entire moving system, coils a cartridge choice based on Continental European Representative. V. B. Sanders, sonic characteristics rather International Publishers Advertising Service, and all, is simply unplugged Raadhuisstraat 24, P.O. Box 25, Graft -De Ryp, Holland. and replaced, just like a mov- than on input compatibility. Telephone, 02997-1303 ing magnet cartridge. Large, In addition, Audio-Technica England: The Paul Singer -Lawrence Media Group, gold-plated connectors insure offers the Model AT630 54 Burton Court, London 5W 3 SY4, England. Phone, loss -free connections so vital Transformer for matching 01-730-3592 at the low voltages generated to conventional amplifier @1979, North American Publishing Co. Established by a good moving coil car- inputs. 1917. ALL RIGHTS RESERVED. tridge. The result is easy field The new Audio-Technica World Library Congress Number 1SSN0004-752X replacement with no penalty AT3OE Dual Moving Micro - Dewey Decimal Number 621.381 or 778.5 in terms of performance. Coil Stereo Phono Car- Editorial Contributions are welcomed but should be With the introduction accompanied by return postage. Submissions will be Careful research indicated tridge. handled with reasonable care, but the publisher as- that good tracking and mov- of this remarkable new de- sumes no responsibility for return or safety of manu- ing coil design were indeed sign, every important barrier scripts, photographs, or artwork. compatible. By controlling effective mass to full enjoyment of the moving coil listening Printed In U.S.A. at Columbus, Ohio. Second-class utilizing a radial damping system similar experience has been removed. Progress in postage paid at Philadelphia, PA arid additional mail- and ing offices. USPS Number 036-960 to our famed Dual Magnet*" cartridges, we sound reproduction from Audio-Technica... ability a leader in advanced technology. U.S. Subscription Rates: 1 year $12.00, 2 years $22.00, 3 have achieved excellent tracking years $30.00. Other Countries: 1 year 518.00, 2 years $34.09, 3 years $49.00. Back issues, when available, $5.00 postpaid. technicaa Audio Publishing, Editorial, Subscription, and Advertis- audio ing Production offices, North American Building, 401 INNOVATION PRECISION n INTEGRITY North Broad St., Philadelphia, PA 19108. Telephone. (215) 574-9600. AUDIO-TECHNICA U.S., INC., Dept.10A 33 Shiawassee Avenue, Fairlawn, Ohio 44313 Postmasten Send Form 3579 to above address. smaller dimension from front -to -back, Empire's EDR.9 and a very large, low pressure degree The Phono Cartridge Designed for of contact between stylus and groove top -to -bottom. The net result of this Today's Audiophile Recordings large contact area, which engineers call a "footprint;' is that the stylus of the EDR.9 can track musical signals to the limits of audibility and beyond, yet has the lowest record wear of any cartridge presently available. The stylus shape of the EDR.9 is called L.A.C. for "Large Area of Contact:' 3. Conventional cartridges exhibit radical changes in their frequency response when connected to different preamplifiers. This is because the load conditions-the amounts of capacitance and resistance provided by the preamp - vary tremendously from one preamp to another, and from turntable to turntable. Consequently, most phono cartridges, even expensive ones, have their frequency response determined essentially by chance, depending on the system they are connected to. But the electrical elements of the EDR.9 have been designed to remain unaffected by any normal variations in load capacitance or resistance. Thus, the EDR.9 maintains its smooth frequency response and accurate transient - Direct -to -Disc and digital recording improve the overall transient response reproduction ability in any music system, irrespective of loading conditions. have added a fantastic new dimension of the cartridge. The end result is a to the listening experience. Greater dy- stylus assembly that has a mechanically namic range, detail, stereo imaging, flat frequency response. The frequency f- lower distortion and increased signal- response extends from the 20Hz to 35Hz to-noise ratio are just a few of with a of the deviation no more than ± 1.75 . . . ..: i- l-}ll- phrases used to describe the advantages dB. No other magnetic cartridge has 'rtL,t of these new technologies. that kind of performance. We call this -} 1 !; I 1 t1L In order to capture all the benefits stylus assembly an "Inertially Damped Ä ' of these recordings, you should have a Tuned Stylus the refinement of which A conventional cartridge's frequency re- phono cartridge specifically designed to took over 6 years. sponse changes when connected to different preamps. reproduce every bit of information with 2. utmost precision and clarity and the ,-; least amount of record wear. , :{ '., +. i t,: The Empire EDR.9 is that cartridge. - 7 Although just recently introduced, it is - already being hailed as a breakthrough 116.4III1111111IdI1, .41II by audiophiles, not only in the U.S., but i' in such foreign markets as Japan, Contact area of Large contact area Ger- . . . . . ordinary of LAC Diamond. a ... . .,. Mw'Är:.... many, England, France, Switzerland and EUiptical Diamond. EDR.9 is not affected by changes in loading Sweden. conditions. What makes the EDR.9 different? In order to reproduce a groove con- 1. taining extreme high frequency musical 4. overtones, the stylus tip must have Then, as a final test of performance, small enough dimensions to fit within we listen to every EDR.9 to make cer- the high frequency portion of the groove. tain it sounds as good as it tests. At Yet, the smaller the stylus tip, the greater $200, the EDR.9 is expensive, but then the pressure applied to the record sur- again. so are your records. face and the more severe the record For more detailed information and Within the cantilever tube, we added wear. In the EDR.9, we have responded test reports, write to: a mechanical equalizer. It serves two to these conflicting requirements by de- purposes: (1) to cancel the natural reso- veloping a stylus that has the proper Empire Scientific Corp. nance of the cantilever tube, and (2) to dimensions from side -to -side, a much Garden City, NY 11530 EWIFE

EMDIFE ENPIFE ENPIFE ENPIFE ENPIFE ENPIFE ENPIFE WARRANTY ENPIFE ENPIFE ENPIFE EMPIFE ENPIFE EMPIFE ENPIFE

Enter No. 16 on Reader Service Card Tape Herman Burstein ide

Wire You're At It... meant to go between the preamp and

Q. 1 have a tape recorder with an power amplifier, and in this case, the amplifier not worth repairing. I also tape output would go to your audio have a 30 -watt power amplifier and a system input (preamplifier) and preamplifier. I would like to take the thence to the decoder. tape transport, power amplifier, and preamp and construct a nice little tape Level Compatibility machine. The preamp is equalized for Q. I am concerned about the com- tape -head playback. I want my ma- patibility of tapes produced on "new chine to be able to record from a mi- generation" cassette decks with my crophone and also from my music sys- original Advent Model 200. I have tem. Now, when I wire this stuff to- been considering the purchase of a gether, will I need any extra equalizers new cassette deck because of its low and, if so, where? Using block di- wow and flutter but have been trou- agrams, can you indicate how I should bled by the lack of a calibration oscil- wire the system?- Nathaniel Stelton, lator within such decks. Advent says Chicago, Ill. that for each type of tape the input ,-i A. To be able to record, you need must be adjusted so that the output of U t, an oscillator circuit of about 80 kHz or the tape yields the standard Dolby higher to power the record and erase level at 400 Hz. Without the internal heads, a circuit with sufficient gain oscillator it is not possible for the user and proper treble boost to supply au- to adjust the input level, and taking dio signal to the record head, a circuit the deck to a service center for this ad- to drive a record level indicator to justment consumes too much money proper indication at a reference re- and time. How much degradation of cording level (one that causes the performance could be expected when meter to read 0 VU for a 400-Hz signal making the change from standard tape that produces one percent harmonic to chromium dioxide and other new distortion on the tape), and proper tapes if one doesn't change the origi- switching facilities to go between re- nal setting of the Dolby level? Will a cording and playback and to choose tape made on one of these decks per- between low-level and high-level in- form adequately on my Advent 200? puts. This is a tall order, and the Tape - Ivan Ross, APO San Francisco Guide is not able to perform such a A. Tapes do differ in their output

design service. I would suggest that characteristics, and Dolbyized tape you search for articles on tape ampli- machines should therefore be properly fiers and write to manufacturers of re- adjusted for the tape to be used. placement heads, who sometimes pro- would imagine that being about 2 db vide circuits to go with their heads. or so off proper adjustment would make only a minor difference, probably an unnoticeable one. This is based Decodering De Deck on Advent's statement for its Model Q. I am considering the purchase of 100 Dolby unit that the expectation a four -channel decoder. What func- when calibrating is to come within 2 tion would my tape deck assume with dB of correct level. However, different such a unit?- Roy Clark, Chicago, Ill. tapes may have outputs more than 2 A. The purpose of the decoder is to dB apart, so that readjusting the tape convert signals on two channels into machine for the particular tape to be four -channel sound. Assuming you used does become important. Accord-

have a program source with encoded ingly, I have to advise you to acquire a signals - such as a phono disc or tape cassette deck which has suitable cali- - the decoder would perform the bration facilities for your use and does above function. Thus, if you have an not require you to go to a service tech- encoded tape, you would play the nician when you change tapes. Q tape into the decoder and the output of the decoder would go to your audio If you have a problem or question on tape system. I do not know at what point recording, write to Mr. Herman Burstein at the decoder is connected to your sys- AUDIO, 401 N. Broad Street, Philadelphia, PA tem; consult the decoder's instruction 19108. All letters are answered. Please enclose a manual on this. Often the decoder is stamped, self-addressed envelope.

AUDIO January 1980 Enter No. 2 on Reader Service Card Our recording tape is consider l by most audiophiles to be the worlds finest tape.

Our tape window is welded r to keep d.Jst

Our pressure pad is bcked into a speciol four-sided retainer to maintain perfect tape -to -head contas.

Our :lia sheet is mace ca a substance thats sc slippery, even glue can' stick to it.

Our leoc r a not only keeps you from rr kinc reco -ding errors it also keeps your tape heads_ clear.

Our special aside rollers moles sure ou' tape stay: perfectly Our cassette is Held aliened will your tape together by steel heeds. screws to assure precise Our tcpe is adored a'ign-nent and even -o our hubby a special d s rioution of pressure 'Dir staidard cassette shell damping pin tha- makes on all s des of the is f rished to feigner tolerance- slippage imposede. casette. the n industry stancards. There's more to the world's best tape than the world's best tape. Our reputation for making the and more work into our cassettes we believe in a simple philosophy. world's best tape is due in part to than most manufacturers put into To get great sound out of a making the world's best cassettes. their tape. cassette takes a lot more than just In fact, we put more thought We do all this, because at Maxell putting great tape into it.

maxe111111ffilliii1111111111111111011111111111111111111 I 111IIIIIIIIIIIIIVIIIIIIIIIIIIIIII l dIrll111111111111M1111111191111k I Illlllli

Mooell Corporation of America, 0Oxford Drive, M0000&ie, N.J 07074. Enter No. 26 on Reade Service Card Projection TV continues to be one of product, appealing (at least at present) those Texas oil barons or Saudi sheiks the more controversial areas of the to a restricted specialized market. It is want to live it up a bit, for a mere $50 current video boom. While "bigger is not a casual product for the average or $60 thousand, they can get a GE Ei- better" has been a watchword in many TV dealer. The systems must be set up dophor projection TV system with an aspects of consumer merchandising in precisely and demonstrated properly. 8- by 10 -ft. screen (!) with picture this country, big -screen projection TV The idea is to educate, not intimidate, quality that will "blow their mind." For has been a slow -starter in the video and I regret to say that such enlight- impoverished mortals like us, GE has marketplace. Some of the reasons ened selling is the exception rather come up with a very clever projection cited for buyer resistance are that "the than the rule. TV system they call the Wide Screen projection systems are too big and Of all the objections to projection 1000 Home Television Theatre. bulky," "the picture is big, but it's not TV systems, their sheer size and bulk GE designates this model Wide sharp enough," Screen 1000 be- "the picture isn't cause the total bright enough," screen area is 1000 and "the projec- square inches. The tion systems are screen is 45 inches much too expen- measured diago- sive." One could nally. Now, there be very cynical and have been some state that if John snide remarks that Q. Public had the at 45 inches this is money to afford a only a Mickey system, the other Mouse type of big - objections would screen TV, but you miraculously dis- can look at this appear. two ways. It's only Cynicism aside, 5 inches less than there are many the standard people who feel screens offered by that their objec- Sony and Panason- tions are well- ic/Quasar, or it's 20 founded. The de- inches more than sirability of big - the biggest tube screen projection size (25") on the TV is self-evident market. But, in any to most people. The question is can apparently are the major reasons why case, 1000 square inches is a helluva they get a system which they feel will people develop sales resistance. De- big picture! The Model 1000 is an im- satisfy the criteria most important to on pending the size and layout of the posing piece of equipment, almost 70 them? I think it pertinent to define available rooms in their homes, when inches wide and standing 49.5 inches what I mean by "big -screen projection they find they may have to devote a high. However, it is designed so that TV." My reference is to units like the room a or major portion of a room to the screen area is 47 inches wide, then Advent Videobeam models, the Sony accommodate a projection TV system, the cabinet drops 26 inches and be- 60- and 72 -in. systems, the Panasonic/ many consumers' enthusiasm for big - comes a 22.7 -inch platform made to Quasar 60 -in. models, the GE Wide screen TV is considerably dampened. accommodate a video cassette recor- Screen 1000, and the forthcoming Of course, there is the other side of der. Most importantly, the total depth Henry Kloss Novabeam. I most defi- the coin, where in many homes the of the Model 1000 is 24.4 inches, and nitely do not mean the "gimcrackery" den or playroom is used principally for you must understand that this is a to- systems which comprise some sort of TV viewing, so the transition to projec- tally self-contained system. The screen lens and mirror assembly kit which tion TV is relatively painless. Nonethe- is not a separate item, placed above purport to turn your TV set into a pro- less, in case, either size is a definite the projector unit, but is within the jection system. Most of these are noto- factor governing the purchase of a furniture cabinet structure and at eye rious for their low brightness levels projection TV system. At this point, level when seated. Furthermore, un- and poor picture resolution, and they General Electric Co. enters the picture. like the curved screens of other pro- probably have turned more people off General Electric has been in the in- jection systems, the Model 1000 em- projection TV than anything else. dustrial area of large -screen projection ploys a flat picture screen. Projection TV is a highly specialized TV a for long time. In fact, if any of The reason why a flat screen can be AUDIO January 1980 Why do so many stars and stu- to match the music as played. but we want b keep our mes- dios use JBLs? And more.dis- Clear and lifelike. sage short and sweet. The cos* than any other speaker? We can state this with reason so many stars, studios Accuracy is the some pride since we and professional installations answer. The create our speakers prefer our speakers is JBL ac - music as per- from the ground up. curacy. Their living depends on formed. That's Concept, design, indi- how good they sound. So if you the sound the vidual components- question your own ears, trust pros insist on. ' x all are created at our theirs. No wonder 7 of and tested James B. Lansing Sound, s t,t o 2..0 > In 2K . h,(R2OK plant the 10 top al- 1.0 lit (íl2) against stringent en- Inc., 8500 Balboa Boulevard, bums in 1978 On -axis fregra ncy response, gineering specifi- Northridge, CA were recorded, L212 system. cations. Rigorous 91329. mixed or mastered on JBLs.** quality control is applied every And that's the sound we step of the way. demand in every We could go into FIRST speaker in our more technical detail line. JBL speak- WITH THE ers are designed PROS.

'Billboard Disco Survey, 1978. "Recording Institute ofAmerica Survey.

Enter No. 20 on Reader Service Card Sound has color. All kinds of wild and way-out and wonderful color. That's why Sony is introducing audio tape with Full Color Sound. To reproduce every shade, every tone, every tint of color that's in the sound itself. Sony tape with Full Color Sound has such a full frequency spectrum it can actually record more sound than you can hear. If your tape recordings don't sound the way this ad looks, switch to Sony audio tape. And be up to your ears in bright brilliant beautiful color.

Enter No. 41 on Reader Service Card used, and why the system can be inte- played on an illuminated digital read- Real Power grated within the cabinet, is that the out. When another channel is select- Model 1000 is a rear projection device. ed, a tiny red indicator dot lights up, for the Real World: Underneath the VCR platform, actual- showing the sensor received a change The Apt 1 Amplifier ly at right angle to the picture screen, a command. Because of the electronic single -gun color picture tube furnishes tuning, it is possible to go directly the TV image, which, through a com- from one channel to another, i.e. "2" plex series of mirrors, is finally pro- to "11," rather than through all succes- jected on the rear of the plastic view- sive channels as is the case with rotary ing screen. This screen is akin to a mechanical tuners. On the control Fresnel flat -lens system, which has the panel on the set are rotary controls for capacity of increasing brightness. The brightness, contrast, sharpness, and an Apt Corporation believes there's only single -gun picture tube avoids the col- off and on switch for VIR (vertical in- one good reason to create a new pro- or convergence problems associated terval reference). There are two sets of duct: a genuine need. The Apt 1 Amp- with three -gun tubes, which naturally color (intensity) and tint (hue) con- lifier is just such a product. With 3 dB would cause alignment anomalies trols. One set is for standard manual of Dynamic Headroom, it can deliver with the mirror system. adjustment; the other is for use when as much as twice its 100w average With our present 525 lines -to -the - the VIR switch is on, and the VIR sig- rated power (20 Hz -20 kHz @ 0.03% inch TV system, even with the most nal is being broadcast as indicated by THD) on musical peaks-just as pro- perfectly tuned closed-circuit system, a red signal light. The VIR feature is of gram material so often requires. And, picture resolution leaves something to help in maintaining correct color bal- it can deliver this extra performance be desired. On most big -screen projec- ance from scene to scene and from is inev- I into any actual loudspeaker, not just tion systems, picture resolution channel to channel, but can get the itably degraded. Further, every big - most accurate color balance when on the test bench. The Apt 1 also in- I have seen up to now use the manual controls. corporates new approaches to power screen picture suffers in varying degrees from a cyan The Model 1000 is a nice -looking supply, driver stage, and protection (blue/green) cast overlaying the pic- piece of furniture of fine walnut circuit design, which all contribute to ture. This should be correctable; a col- veneers, with contrasting beige -col- a useful amplifier. uniquely or tint control should in essence intro- ored suede VCR platform and control Problem Solving duce more red into the signal, and, panel fascia in the same material. The since red is the complement of cyan, optimum viewing distance is about 12 in a Real System: the cast should disappear. Whatever to 14 feet from the screen and, as 14 The Holman Preamplifier the case, either those demonstrating noted previously, directly on axis. The the particular projection TV are not impact of such a large bright picture bothered, are not really aware of the with well -saturated colors, good clean cyan cast, or they don't know how to whites, and good contrast ratio is dra- make the tonal correction. All this is matic. All kinds of programs benefit leading up to the fact that the Model from the big screen but, needless to 1000 does not suffer from this malady. say, football, baseball, and all other The picture resolution and screen sports furnish a greater sense of action You don't live in an ideal world- brightness are the best I have seen on and become much more exciting. neither does your stereo music sys- any big -screen projection system thus Refinements I would like to see on a tem. The Holman Preamp is the re- far. Like all projection TV systems, "Mark Two" model? I'm old-fashioned brightness is obtained when enough to want the facility of fine tun- sult of over 2 man-years of research maximum on axis. channel. It is an into how and why components be- viewing the picture directly ing each automatic Even slightly angled viewing causes a function now, and I must confess have in real -world hifi systems. As rapid fall -off in brightness. Another there are no picture anomalies, no ver- such, it provides an unprecedented point in favor of the Model 1000 flat tical rolling, etc., but I want to see if I balance of features and perfor- screen is the even distribution of can beat the automatic control and get toward a mance, which combine brightness and picture resolution over an even better picture! The remote common goal: sonic excellence. the entire screen area, a good deal bet- control is great, but it should be made The Holman Preamplifier and the ter than with other systems. full function, capable of changing col- Apt 1 Amplifier; individually or to- The Model 1000 uses digital circuitry or and tint and brightness and con- gether they make music systems for push button electronic tuning of trast. As you can imagine, the VCR work better, and sound better. channels. There are controls on the set platform invites you to do the obvious: and a hand-held remote control (of Mate this big -screen projection TV For information, check the appro- the high -frequency sonic signal/sensor unit with a good video cassette recor- priate box(es) below and send with type) which works on both UHF and der. At a list price of $2,895.00, the your name and address to: VHF services and can turn the Model Model 1000 is the least expensive of

1000 on and off, adjust volume levels, what I choose to call the "legitimate" and activate a muting switch. There projection TV systems. Evidently a lot Apt Corporation are push buttons numbered one of people are as impressed with the Box 512 through nine, and a zero, and another Model 1000 as I am, since over 30,000 Cambridge, Massachusetts 02139 push button designated as "enter." In hale been sold - far more than any use, the desired channel number is se- other system. After months of use, the Apt 1 Amplifier brochure and the name of your local dealer. lected, then the "enter" button is delights of big -screen TV haven't pushed to activate the channel palled on me, and so far this unit has Holman Preamplifier brochure. change. The channel selected is dis- proved to be utterly reliable. 4J For an Apt 1 Owner's Manual, please send $4 ($5 foreign). AUDIO e January 1980 Enter No. 4 on Reader Service Card Technics RS -M85 MK2 with metal tape. We pushed performance to a new high. But kept the old price*

I'ß(.111tCSA9H!. Nl:1 tw 2nazn< Ocusrrz toot 37C Mid

Last year you could get the precision of direct drive and instantly applies corrective torque whenever the and the unparalleled accuracy of quartz wit`1 Technics slightest speed deviatior is detected. RS -M85. The cassette deck Aucio magazine (June '79) Another one of the RS -M85 MK2's bright spots said "had the best tape speed Characteristics ever is its two-colored fluorescent (FL) bar -graph meters. measured in a cassette deck." this year you can get A device attack time of ',ust 5 millionths of a second that same accuracy with the RS -M85 MK2. Along with proves they're fast. While no more than 0.1 dB devi- the additional benefits of meta tape. Yet we didn't ation from the 0 VU level Droves they're accurate. add a cent to the price. And that's proof enough. What we did add is more dynamic range, a wider Sill, the RS -M85 MK2 has even more: Like a frequency response and sendust-fornulation heads separaife,coreless DC motor for reel drive.Dolby`NR. that easily handle the difficult jobs of recording and A low--loise, highly linear amplifier section. Full IC erasing metal tape. logic controls. A 3 -position bias/EQ selector with bias One more difficult job the RS -M85 MK2 easily fine acjustment. And an optional full -function infrared handles is keeping wow and flatter down, to a micro- wireless remote control (RP -070). scopic 0.035% while maintaining excellent speed Technics RS -M85 MK2. We pushed the perform- accuracy. But that's not surprising. At least not with ance Lp. Not the price. Technics quartz -locked direct drive. This servo system FREQ. RESP. (Metal): 20-20,000 Hz. WOW AND compares the rotation of our direct -drive 'motor with FLUTTER: 0.035%WRMS. S/N RATIO(Dolby in):69dB. the unwavering frequency of a quartz oscillator, SPEED DEVIATION: No rrore than 0.3%. 'Based om Technics recommended or. for RS -M85 and RS -M85 MK2, tDolbyTechnics rs.o trademark of Dolby Lobo, atones. Enter No. 15 on Reader Service Card Professional Series Edward Tatnall Canby

1980! There's nothing like another historical comment on our brief audio present and much larger world of au- round -number year to make us think span of years; when I got back there - dio and hi-fi began. As every older au- back into the deciPast, and all those no thanks! Not a chance. I had some dio engineer knows, there was no such

amazing things that have happened in right ideas, all right. But I wouldn't thing as audio, officially, until after

those brief units we call decades. That want you to read the way I talked WW II. Audio sort of fell together out is, those of us who are equipped with about them. Makes me cringe to read of many parts and areas. Even our a deciPast. And to heck with you kid- the stuff. Famous last words. magazine was once called Radio. dies who don't even have a dP yet. So After three long years (beginning The main business of this fallen -to-

to herald 1980, I am going back 6 dP with issue No. 7 of Audio Engineering, gether audio, as I have often said, is

and more, before I turn again resolute- November of 1947) in the infinity of music and has been since the turn of

ly forward into the great Future of au- my new wisdom I wrote, for instance, the century, in and among those earli-

dio. two columns entitled "How I Fell into er areas and in spite of billions of spo-

6 dP. Yeah. I recently had to throw Audio." That heading so amused our ken words of one sort and another. out an old empty cardboard shaker audio fraternity that most of them The phenomenon that has put us on can for cleanser, the map as a vast, bright metallic refined industry of green, which had technological and on its side in large artistic superlatives letters NEW 1950 is simply the fact of BAB -O! Every year reproduced music, it got to look sillier. contrasted with the Ou sont les cleans- earlier normal ex- ers d'enten? Down perience of music in flesh, the 16 the drain, where the else. Where are the only sort that had hi-fis of yesteryear? previously existed. Up in my attic. The slow discov- One of our ex -offi- ery and unfolding ci named Charlie of this new experi- recently asked to ence, music de- explore my attic for tached from its ori-

possible antiques; I gin, music in hith- said no. Wait erto unlikely awhile, for a better places, music for

deciPast. In 1940 I anybody, any- remember worry- where, anytime, ing about what to music at our per- call the new car sonal command to models; my family start and to stop had a '39 and it seemed funny to speak never got beyond the title itself to read at will, is indeed the very history of au of a Forty -Ford. Don't remember a the articles. For months people kept dio-for without the musical aspect thing at the moment about 1960, and greeting me with fatuous remarks, the rest would have been nothing

nothing of any great importance about such as, "Hi ETC, still falling?" Yes, I much. No, I am not denigrating those

1970, but 1930 was the Winter of the was. And still am. Even so, I have man- areas where speech is important! Good Great Depression and we bought a aged occasionally to fall first, in my job done, right along. But without the Thirty -Ford right in the middle of it. mildly crackpot way, at least in print. sound of music, audio would be pretty

That was the "A" I sold when it had Who the heck was writing obscurely dull stuff, you'll have to admit. Even in

run up a mere 0.5 dP. Now I know bet- about the future belonging to digital, ' broadcasting, where speech is of the

ter. I could have me around $14,000 for back quite a few years ago when you essence. Not to mention commercial

it. So I guess I'll preserve my attic hi-fi. hadn't even thought about it? And messages. Come see me around 2001, Charlie. who stumbled and fell all over Dolby One does indeed eventually get to - 1964? - right in this space, the very 0.1 dP know better my kind of enquiring first who ever did, according to Ray My generation was the one that mind, if by hook and crook and mini - Dolby himself? made the transition into this new

increments. I am frankly shocked So my present task is to extract a bit world of music and we could not help

(NOW we get to the point) by my own of sense out of how I did indeed fall it. We fell into it in spite of ourselves, writing in this magazine some dPs ago. into audio, a music lover, musician, pros and amateurs alike. We began

I fear it just wouldn't do today. I had and non -engineer out of a very literary when recorded music was Caruso sing-

thought I might rerun a few superbly and unscientific family. It was no more ing Over There in WW I, plus a passel classic early Canby columns, just as an then a microcosm of the way that our of tiny tidbits of opera and a lot of AUDIO January 1980 L07M11 interior The Ultimate Amp. Ox: to 600,000x: (F3dBJ.

For the past several years, a special team of In fact, everything in this amplifier has been innovations requires much more space than is top Kenwood engineers have been re -inventing engineered to reproduce an input signal audibly available here. Please write for full technical the amplifier using their most sophisticated free from distortion and coloration. And to data at the address below. Or better yet, innovations in circuit design. achieve a frequency audition this remarkable amplifier system at This is the result: The LO7MI1 Hi-SpeedTM response previously a Kenwood Audio Purist Group dealer. If you DC direct -drive amplifier system. unobtainable. Our DC have the ears to appreciate what the Kenwood Our research determined that long speaker amplifier improves engineers have accomplished, the LO7MI1 ultra -low frequency system will take your breath away. phase shift and transient response. Even the pin plugs of the input cables and locking connectors are gold-plated to insure no signal loss.

HI-SPEED. ,

L07MII rear L07MIl front Even more remarkable is the inclusion Typical "square ' Pulse of Kenwood's exclusive high speed circuitry. pulse waveform waveform cables seriously degrade sound quality: By allowing the amplifier to react faster to of conventional of High -Speed Total harmonic distortion doubles, dynamic changes in the musical input, Hi -Speed amplifier. amplifier. damping reduces by 40%, produces a more accurate sound. This is espe- and there is discernible cially critical in the mid -to-high frequency tran- "ringing" In locating the sients where conventional amplifiers lose their Significant specifications: 150 watts one channel minimum power RMS at 8 ohms amplifier close to the imaging and detail. The LO7M11 separates indi- from 20 Hz to 20,000 Hz with no more than speaker by using a special vidual singers in a vocal group or individual 0.007% total harmonic distortion. S/N 1 -meter cable, THO and string players in a symphony orchestra with 120d8. Rise time 0.55 µSec. Slew rate ± damping are not affected equal ease. 170 V/µSec. and "ringing" is eliminated. Of course, to appreciate the many design AUDIO PURIST GROUP THE L07M11 SYSTEM Pre -amplifier KENWOOD' Power Amp Optional Tuner Not all Kenwood dealers carry these products. For the Audio Purist Group ® Dealer nearest you, write Kenwood, PO. Box 6213, Carson, CA 90749. In Canada: Magnasonic Canada, Ltd. Enter No. 24 on Reader Service Card seums. Mommie gave me Mother scratchy humor stuff, miraculously in- ago when I wrote those "How I Fell" telligible. When radio was something articles for the magazine. Goose records from the Five and Ten, and I played Favorites you had luck with if you "got" a few The Year One for me, in this rewrit- Popular too. distant scrambled words here and ten history (which will continue from Yes, I knew the mechanism and could

I make it go all by myself, including there. I fell into this a bit early, per- time to time was d- early. must windup when the sound began to haps, because I was more aware of have been age six. I was given a toy droop. But I broke some of the records what I heard than some others around phonograph as a pacifier. It was a big, me. But what happened to me, early circular "Victrola" (registered trade- and scratched more, until one day on, was what happened to US, all of mark, though at that time it applied to Mommie got annoyed and said that if I on a us, later and on a much grander scale. almost any piece of reproducing kept being bad boy the Victrola might play the wrong tune for me, and I could not avoid it; l mirrored audio equipment). It was in orange enamel and hi-fi in advance, aspect after as- and with vertical slots around the sides wouldn't that be too bad. Kids take things seriously. That pect. I was of course blissfully una- to let the sound out. You'll find this ware of this, at least until several dP model in all the history books and mu - threat had me in a state of terror for days. I was deathly afraid to put on a record, for fear of some ghastly sonic reprisal. Something HORRIBLE might

come out. I screamed if I saw the ma- The New ADS L810 -II chine. Finally, it had to be put high on a kitchen shelf out of my way, but the thought continued and so did the " radicai improvements threat - all too effectively. I remember the feeling! I haven't ever forgiven wouldn't have been Mommie for that ploy, because, you see, I had not the foggiest idea of what reproduced music meant. A Victrola possible..."* was a thing that talked by itself, or made its own music. For years I called it just "Victrola music" without any

idea that what I heard had an earlier and outside source in some living performance. Mommie was just playing tricks on me, out of her own continu- 18 ing amazement that a mere machine could sound intelligent, right out loud. That was the general feeling. What I find absolutely astonishing to this day is that ever since, and throughout the history of our present hi-fi sound, we have been moving steadily towards this very concept in all our musical audio. We know, of course, that there are often "live" performers behind a recording. But the

(ADS El Os sYo 4,1 wrtb Jpl+onat stands Ffflu sound we hear, and the sound we try for, is ever less and less "the original" and more and more a sound in itself, for itself, existing in its own terms. Cu-

".ADS' Sere; I speakers re subtly imp-oved over the orginal versiors riously, that idea of "Victrola music" - radical improv emeits wocjdn t have been possiblecznsidering the h g1 has shaped my entire writing life, as it has shaped quality of the one nag. The E -C was highly respected fy-its extreme clariti, the enormous software of and for the natural, tigit bass -esponse it e>hibitea. Th Series Il continues audio sound. o offer these a trt utes, will -andle more power, and have better high en I From the age of six onwards I be- dispersion. Afine speaker tas teen made better, arc we :ecommend t came schooled in what the artists (and the opera people) call fac- Yighiy. As iu.ted'rim the Vey 79.'9 Complete Buyer's Gitde:msterec Hi-Fi Equipmen_ verismo- tual realism. Don't we all? Pretty soon, ADS has indeed spared nothing in the quest for petfectibn. Less than I knew what every schoolboy knew, -he ADS 81) s accurate enough for the professional S375 apiece that Santa Claus might be a myth but - for the love- of rood music alt recording engireer d affo-dab e enough Caruso was a big fat MAN who actual- home. Discover he best today. Discover the ADS L81C-11. ly existed and ate large quantities of There is a selected DS dueler near you. spaghetti. When he died, more or less For more informat on and coy-plee reviews, write ADS. Dep AU10,orcal in the middle of a performance, we

1 1 for OperatDr 1-800-824-7888 (Cali 'e cria 800-852-777) toll free an as kids made fun - we would let out 433. portentous opera noises, then suddenly produce strangling gargles and fall

flat on the ground, stone dead. So I knew! Everybody knew. It was the be- ADS Where technologi serves music ginning of the people's awareness. And it led very shortly to big things Analog & Digital Systems, I -L., One Progress Way, Wilmington, Ma 01817 (617) 658-5 00 including Amos & Andy, King George AUDIO January 1980 R a h , `.,,,...r.ra h r

All your records will sound better with Dual's new ULM tonearm and cartridge system.

*ley look if 11 ce this.

Although none of your records may Dual's research into the effects To experience the demonstrable be in such bad shape, many are of mass on record playback led to advantages of ULM, bring a badly probably warped enough to present a collaboration with Ortofon. warped record to your Dual dealer. serious problems to conventional A cartridge was developed with Listen to it played with the ULM turntables. substantially less mass than any in tonearm and cartridge. (All nine The high inertia of a typical existence. It weighs just 2.5 grams, new Dual turntables feature this tonearm and cartridge combination, including mounting bracket and system.) with approximately 18 grams total hardware. You will hear the difference that effective mass, causes the stylus to At the same time, the mass of ULM can make on all your records. dig in riding up the warp and to take the Dual tonearm was further For the complete ULM story, off on the way down. Tracking angle reduced so that a perfectly matched please write to United Audio and tracking force vary widely- tonearm and cartridge system directly. as much as 30 percent. And a warp emerged. Its total effective mass is ULM. as small as 1.5mm (which is just 8 grams. That's less than half A major breakthrough in record barely discernible) can generate the mass of conventional tonearm playback technology. harmonic distortion of 2.7 percent. and cartridge combinations. That's audible! Tracking a record with the same These problems have now been 1.5mm warp, the ULM system solved by Dual's new Ultra Low reduces harmonic distortion to Mass tonearm and cartridge system. only 0.01 percent. That's 270 times The potential for this solution has less than that produced by the existed ever since the development conventional tonearm and cartridge. of Dual's dynamically -balanced Not only is the overall sound tonearm with its gyroscopic gimbal audibly improved, but stylus United Audio suspension and straight-line and record life are significantly Dual 120 So. Columbus Avenue tubular design. extended. Mt.Vernon, NewYoik 10553. Bert Whyte the es It seems that dy- the glory of music! namic range con- Who indeed tinues to be one of would not strive to the most misun- simulate this expe- derstood aspects of rience in the home modern recording listening situation? among audiophiles All right, so and, unfortunately, among other fac- among some tech- tors in our quest nical types who for that elusive should know bet- concert hall, real- ter. In my column ism in our home in the July issue of playback systems Audio, I explained we agree that wide that no matter dynamic range is a whether a "super- high priority con- duper" analog sideration. One of tape, direct -disc these days we will cutting or digital have a true digital tape master was disc with that the source used to vaunted 90 dB of cut a standard ana- dynamic range log lacquer, under and, sad to say, absolutely ideal few audiophiles conditions the maximum dynamic time before this problem is resolved. will have equipment capable of accu- will be on the order 22 range obtainable What is on the record market, and be- rate, high -quality playback of such re- of 62 to 64 dB. ginning to appear in increasing num- cordings. Well, just to prove that not every- bers, is the digital/analog hybrid long- In fact, however, it is presently body reads my column (harrumph), in playing disc. This is the same 33'/3 -rpm, shocking quite a few audiophiles to the past few weeks I have read a PVC, microgroove disc we have been find that their playback systems newsletter issued by a fairly prominent using for the past 29 years, except that can't with the 64 -dB dynamic range of manufacturer of esoteric loudspeakers, the master lacquer was cut from a digi- cope wherein he touts several of his models tally recorded master tape. The fact the present digital/analog hybrid discs! A good case in point is the new as being able to cope with the "tre- that the digital master does indeed Telarc recording of that old warhorse, mendous 90 -dB dynamic range of the have a 90 -dB dynamic range does not new direct -cut and digital discs." Then confer this range to the analog disc cut Tchaikovsky's 1812 Overture. As is now standard practice with Telarc, a few days later a well-known audio from this tape. they used Dr. Tom Stockham's Sound- writer in a very famous newspaper recording system for goes on at length about the "90 -dB dy- Who Needs It? stream digital mastering this recording. First, the ac- namic range of the fabulous new digi- To many, it is pertinent to ask, why music the 1812 was recorded in tal discs." No wonder the audio con- all this fuss about dynamic range and tual of Music Hall, the sumer gets confused and, chock full of the apparent desirability of 90 dB of the Cincinnati with Symphony Orch. under the misinformation (and brist'ing with dynamic range? The obvious answer is Cincinnati baton of conductor Erich Kunzel. Then questions), descends on his hapless that wide dynamic range is one of the recording crew to nearby audio dealer. Let's try to get the record major factors in the sense of realism of the went Ohio, where they record- straight (pun intended) once more. No the concert -hall listening experience. Mariemont, ed the bells of the Emery Memorial direct -cut disc, recorded by me or any- In fact, the dynamic range of a full Carillon. Finally, the crew traveled to body else, has a dynamic range of 90 symphony orchestra does exceed 90 Baldwin -Wallace College in Berea, dB. Secondly, you can't play back a di- dB, but this is somewhat dependent where the Fifth Virginia Regi- gital disc with 90 -dB dynamic range, on the dynamic scale of the work Ohio, ment (an antique arms group) fired off for the very simple reason that there being performed. To understand the 24 different charges from three differ- are no digital discs presently on the emotional impact of truly wide dy- ent and authentic 19th century can- market! namic range listen to a Mahler sym- nons which were recorded on the digi- The only digital discs in existence phony in a concert hall, with a triple Shades of the old Mer- are the experimental prototypes of the pianissimo passage followed immedi- tal equipment. cury Records days when they recorded laser optical, mechanical, and capaci- ately by a triple fortissimo outburst at West Point for tance types some of us have had the from the full orchestra. The full weight the ancient cannon their 1812 Overture! opportunity to hear at recent shows of strings and woodwinds, the brazen and conventions. At the present time, blare of trumpets, trombones, tubas, At the Soundstream facility in Salt Lake, the three recordings none of the competing digital discs French horns . . . the thunder of tym- were edited has been accepted as a standard, and pani and bass drums. This is to know and a composite made of the music, unfortunately it may be quite some the searing, ecstatic, quintessence of plus carillon bells, and the requisite 16 AUDIO January 1980 THE PHASE 7000 SETS OPTIMUM BIAS/LEVEL/E AUTOMATICALLY. stan are looped, so they rotate at precisely the same speed. Tape slack is automatically eliminated before the dual pinch rollers engage. The tape is isolated between the two rollers, so it's free from external vibrations. This helps keep your music free from pitch variations. And it reduces modulation noise to extremely low levels. The "drive" capstan's speed is regulated by a quartz -phase lock loop system that detects any speed variations, and instantly corrects them. Speed drift is less than 0.02%. And wow &fhuter drops to an amazingly low -0.03% LAB TESTS EACH TAPE, MicroScan automatically determines WRMS. INCLUDING METAL, AND optimum bias/leveVEQ, and stores this STORES DATA IN MEMORY data for 9 different types of tape in its SPECTACULAR SPECS The Phase 7000 is the cassette deck memory. Like a technician, MicroScan that can get the best out of every tape, applies a test tone to the tape, then because it has a microcomputer that varies the bias current over 64 possible works like a lab technician, testing each steps. It then scans the tape in playback tape and making precise recording to determine optimum bias with an ac- adjustments. curacy of ±0.2dB. It sets optimum level Every type of tape varies by manufac- and EQ the same way. You get the most Metal, Fe turer. So each tape needs a different out of STD, Cr02 and -Cr The 7000 out -performs all other cas- bias, level and equalization setting to tapes. And it takes less than 45 seconds. sette decks, and rivals the best reel-to- minimize distortion and flatten fre- Once MicroScan has determined the reel. Signal/Noise with Dolby* on is best settings, in quency response. Metal tape is so new you can store this data -70dB. Double Dolby allows you to that bias standards haven't even been memory, ready for instant recall. No record with Dolby, while monitoring it further scanning is necessary. set. So the ordinary 3 -position bias con- with Dolby. The 3 -head system with trols can't possibly do it justice. Uni -Crystal Ferrite heads achieves a fre- ADVANCED TAPE quency response of 20Hz-20kHz,- 20dB To make proper adjustments for re- TRANSPORT SYSTEM cording, you'd have to put each tape with metal tape. The fluorescent meter through a lab test-the same test that's To avoid pitch variations, tape must gives you 24 -segment resolution for easy automatic in the Phase 7000! travel at a constant speed. Most cassette readings from -30dB to +8dB. decks have just one capstan, and a pres- If you like the look of these numbers, MICROSCAN: sure roller to apply tension to the tape. wait until you hear how they sound. A MICROCOMPUTER WITH But tape irregularities cause tension to Contact your Phase Linear audio dealer 9 MEMORIES vary in this system, increasing wow & for a convincing demonstration. flutter. The Phase 7000 solves this problem with two direct drive capstans. The

"drive" capstan and the "tension" cap- 20121 48th Avenue West, Lynnwood, WA 98036

'Dolby is a trademark of dolby Laboratories, Inc. Enter No. 32 on Reader Service Card cannon shots in the spectacular finale. holes of their cannon, and . . . . and There was no doubt that the digital instead of a mighty WHUMP! from master had a faithful recording of the your loudspeaker, there is a deafening stupendous energy of the cannon SILENCE! What happened? Well, if ifit shots. Then it was up to Stan Ricker at you were lucky, dear friend, you just Inta 5 h the JVC Cutting Center in Los Angeles blew the protective fuses (or circuit to transfer the digital master to an ana- breaker) on your speaker system. If log lacquer. If you look at the record, your speaker system wasn't fused, you between the label and the run -out may have a woofer that sustained a di- groove, you will see inscribed "A-11," rect hit. Nothing daunted, you figure "A Technological meaning that even a cutting engineer you'll turn down your volume level to as superbly skilled as Stan Ricker re- the point where the cannon shots quired 11 attempts to produce a satis- won't blow your fuses. Well, that is Masterpiece..." factory master lacquer. You can hold smart, but now if you play the 1812 the disc of the 1812 at arm's length from the beginning much of it is at too and easily discern the almost right-an- low a level and out of dynamic pro- gle contortions of the grooves contain- portion. ing the cannon shots. It is a tribute to So your playback system has been Stan's skill that close examination zapped by 64 dB of dynamic range. reveals grooves so close together there Consider this: When the real digital is almost no land visible, yet he didn't discs do come, whether they be of the overcut. The groove velocity and the laser/optical type or whatever, there low -frequency energy of the cannon will be no tracking difficulties (when shots, centered around 30 Hz, are sim- everything is working properly) and ply tremendous. the disc will furnish you with the 90 dB

. McIntosh C 32 Needless to say, the first question of dynamic range you've been looking that comes to mind when confronted forward to so eagerly.

by this recording is can the cannon Sarcasm aside, do I seem to be advo- "More Than a Preamplifier" shots be tracked? Well, I can tell you cating either an abandonment of digi- that distress flags are flying every- tal audio or a restriction of dynamic

where, and audiophiles are keeping range? me, I McIntosh has received peerless ac- Certainly not friends. can telephone lines to phono cartridge track the cannon shots, Mark Levin - claim from prominent product 24 manufacturers buzzing with their tales son's ML -3 amplifier has the voltage testing laboratories and outstand- of woe. I have tried quite a number of pulse and great current capabilities to ing international recognition! You arm/cartridge combinations and can reproduce the cannon without clip- can learn why the "more than a tell you that most cartridges, including ping, and Bob Fulton's Premiere some very fancy types, just can't hack speakers simply mirror the visceral preamplifier" C 32 has been it. In many instances, the arm just vio- punch of the cannon shots. However, honors. selected for these unique lently jumps out of the groove! What it must be noted that some highly re- did work? The combination of the spected engineers, directly connected Send us your name and address Technics EPA -100 arm and the Shure with digital recording technology, and we'll send you the complete V-15 Type Four, utilizing its brush and have been thinking out loud that for viscous product reviews and data on all damping system, at a tracking the domestic listening situation, some force of two grams, reproduced the vi- sort of restriction of dynamic range on McIntosh products, copies of the olent transients without distress. The the digital disc may become necessary. and a North international awards, unlikely combination of an old Picker- This is as much a consideration of the American FM directory. You will ing 4500 CD -4 cartridge and the arm next door neighbor as it is of the man- understand why McIntosh product on the superb new JVC Professional ufacturers of audiophile equipment, QL-10 turntable also tracked the shots, research and development always especially loudspeaker manufacturers, albeit at a somewhat elevated tracking who will need to produce a new gen- has the appearance and tech- force of 2.25 grams. eration of playback equipment to cope nological look to the future. with the dynamic demands of digital

64 -dB Silence discs. In a future column, I will report Let us continue this dynamic tale on some conversations a Keep up to date. (and visit or (ouch!). So you have the record and a two) I've had with some loudspeaker Shure Type Four, Send now - - - and now you're manufacturers on this subject. In the ready to start your barrage. Hah! Once meanwhile, keep your powder dry! again you are going to find out about 64 dB of dynamic range, in very practi- Addendum McIntosh Laboratory Inc. cal terms. You know every note of the At the SCES I finally heard a demon- Box 96 East Side Station 1812, so in the early quieter sections stration of the British Ambisonic Sur- NY 13904 Binghamton, you set your volume level so that pian- round Sound System, which uses the

issimos are just audible above the am- Calrec Soundfield microphone, and I Name _ bient level of your listening room. The was quite impressed with it. I had Address music unfolds, the drama builds, and promised more on this, but inasmuch finally the French are charging to the as I have been offered the use of this City State Zip brave fanfares of the Marseillaise, and system, I will be making appropriate the defenders of Moscow are about to recordings and will then bring you a If you are in a hurry for your catalog please put their slow -match to the touch first-hand report. send the coupon to McIntosh. For non -rush A service send the Reader Service Card to the magazine. AUDIO January 1980 Enter No. 25 on Reader Service Card Introducing the ADC I700DD turntable. The quality begins with the tonearm...

...and keeps on gol

The toneorm you'll find on the ADC 1700DD Supporting this resonance-con - reduces moss and resonance to new lows. So the ceiling base ore energy absorbinc;. music you hear comes out pure and clean. resonance -tuned rubber suspension Our engineers have combined the latest advance- Feet. These suspension Feet help ments of audio technology to create the amazing to stabilize the hose while con- 1700DD, the First low mass, low resonance turntable. trolling resonance. The Famous LMF carbon Fibre tone- The motor in the AIX 1700DD is also present

arm was the model For the sleek black standard of excellence: Direct Drive Quartz Phase - anodized aluminum tonearm Found Locked Loop. A quartz crystal is used on the ADC 1700DD. The heodshell in the reference oscillator of the is molded carbon Fibre, long known motor. An electronic phase com- For its low mass to high tensile strength parator constantly monitors any ratio. The viscous cueing is a gentle variance in the speed, making 4mm/sec., and the tempered spring anti -skate adjust- instantaneous corrections. Even when ment is infinitely variable to 3.5 grams. The pivot out of the Quartz -Locked mode, the system uses stainless steel instrument bearings, optical scanning system keeps drift at below 0.. which ore hand-picked and perfectly matched to both Wow and Flutter ore less thon .03%. Rumble is on the outer and inner races For virtually frictionless move- incredible--70dB Din B. ment. All this makes it the best tonearm Found on on The result of all these breakthroughs is pure, integrated turntable. uninterrupted enjoyment. The base on the ADC 1700DD We invite you to a demonstration of this and the turntable is constructed of o highly other remarkable ADC turntables at your nearest dense structural foam which absorbs Franchised dealer. and neutralizes resonance and Or write For Further inFormation to: ADC Feedback. The speed selection Professional Products, a division of BSR Consumer control is on electronic microswitch Products Group, Route 303, Blauvelt, N.Y. 10913. which will respond to your lightest touch. Distributed in Canada by BSR (Canada) Ltd., Ontario.

A D C ADC. We build breakthroughs. Enter No. 9 on Reader Service Card THE B&W DM2/II. A CLASSIC IN EVOLUTION. AudiòcIIníc Joseph Giovanelli

Electrostatic Speakers in this way, you will draw power from and Amplifiers the amplifier because the pad is across Q. Do electrostatic tweeters require the circuit. a special type of amplifier? -Name As far as the kind of cable to use, withheld. this is a matter of the length of the run A. Electrostatic tweeters may or may between speaker and amplifier. Some not require special amplifiers. This de- of the speaker wire I've seen should pends on the equipment included never be used at all. This is often 22 - with the tweeter. Some tweeters - at gauge or smaller wire, and it is never least one type - can be purchased as suitable for high-fidelity installations. nothing more than the diaphragm and For fairly short runs, I recommend No. the two fixed plates. Such a tweeter 18 -gauge wire. If the run is greater operates at very high impedance and than 15 ft. or so, use No. 16 -gauge line.

requires an external polarizing voltage. If the run is more than perhaps 40 ft., I Both the polarizing voltage and audio would suggest No. 14 -gauge line. For were often derived from a direct con- really long runs and where the wiring of Despite the almost daily claims nection to the output stage. is put into the wall, then I would sug- revolutionary breakthroughs, loudspeaker The more common electrostatic gest that you use No. 12 wire, perhaps process. design is basically an evolutionary tweeter is equipped with internal po- in the form of BX or romex cable. You the new B&W DM2/II, for Consider larizing power supply and a step-up should use electrical outlet boxes at When its predecessor, the original example. transformer. This transformer gen- each end of such an installation so DM2, was introduced several years ago, it erates the high voltage needed to feed the speakers with was widely acclaimed as a classic of impec- that you can drive the tweeter. Such units are cable design and outstanding performance. con- more flexible cable. nected to the amplifier in the same In pursuit of excellence. manner as a conventional woofer 26 or Reducing Bass Leakage Since that time, however, B&W's tweeter. I live in a high-rise apartment com- unparalleled research and development pro- The major problem with this latter plex, with neighbors on all four sides. insights gram has yielded new and fascinating type of tweeter is that it presents a To keep bass vibrations from annoying virtually every aspect of speaker design into high capacitance load to the power them, I placed my loudspeakers on 12 - and performance. amplifier. This load can cause either or in. thick styrofoam boxes in which fro- From these uniquely innovative both of two reactions: The amplifier zen meats were shipped. They appear studies has emerged a completely new design can become unstable and break of surpassing accuracy, the B&W DM2/II. into to be doing the job, for 1 have received Each driver of the DM2/II has been oscillation, or the high -frequency re- no complaints.-Merritt E. Tilley, Ill, designed for exceptionally smooth response sponse can become'impaired because Syracuse, N.Y. range. The crossover of the shunting action of such a high over its entire operating "Pops" Revisited is a computer calculated nineteen element value of capacitance. network employing true third order Butter- When buying an amplifier suitable I am writing about a letter in your worth filters that result in significantly lower for use with such electrostatic November, 1976 column from Mr. intermodulation distortion and exceptional tweeters, or full -range electrostatic Krehbiel who expressed concern amplitude characteristics. a noise in his com- phase and speakers for that matter, be sure to se- about "popping" ponent system. I have had this prob- Listening. The final proof. lect one designed to remain stable when used with high capacitive loads. lem from two sources and have solved Listening to the B&W DM2/II is, quite them both. simply, a revelation. It produces completely One was a "popping" resulting from uncolored sound of extraordinary natural, Controlling Extension Speakers other circuits in the house being clarity and depth. Moreover, its modest size Q. I would like your comments on turned on, i.e., the furnace and the re- and elegant appearance permit advantageous the design of an on/off switching cir- frigerator. A 0.01 F, 600 -volt d.c. ca- placement in almost any listening area. cuit, determining proper load to be N As with all B&W loudspeakers, each pacitor across the circuit of the motors put in the line when one speaker in a DM2/II is individually tested and shipped with or thermostats of these units worked main/remote system is off, a recom- its own proof of performance chart recording. well to eliminate that problem. mended type cable from the ampli- However, the ultimate proof of per- of Static discharges occurred in my sys- to the speaker and controls, and formance is in the listening. Your B&W dealer fier tem regularly, but only on "phono." invites you to audition this classic contribution the selection of volume controls. - This was corrected by the use of a technology and Arthur P. Darrow, Troy, N.Y. to the evolution of speaker room humidifier. -Greg Herring, To- for yourself. A. As far as the volume decide controlling ronto, Ontario, Canada. A For additional information write: of individual speakers is concerned, I P.O. Box 653, Anglo-American Audio Co., Inc., recommend the use of L or T pads at Buffalo, N.Y. 14240. In Canada: Remcron each speaker. These pads will serve to If you have a problem or question about audio, Electronics Ltd. turn the speakers merely by off - write to Mr. Joseph Giovanelli at AUDIO Maga- turning the pad down all the way. This zine, 401 North Broad Street, Philadelphia, PA eliminates the need for special on/off 19108. All letters are answered. Please enclose a B&W Loudspeakers. switching. Of course, by using the pad stamped, self-addressed envelope. The next step up. AUDIO January 1980 ee ords you own were probably cut on our

re »X S al get the turntable and cartridge designed e° veers.

then compensates instantly. sion that the MC -1 is simply capable The JVC Turntable Drive. The of extracting more music from well - ',W s2"1 same rotational drag is again en- cut grooves. countered in playback of heavily - The JVC Laboratory. Only a modulated grooves. While no beltdrive company with a research facility large is capable of compensation, the Phase enough to undertake the redevelop- 1fT111111111111111111111 . Comparator logic system in the ment of mastering technology could QL-10 virtually eliminates these in- have undertaken such a dramatic re- stantaneous pitch variations and the thinking and execution of disc play- audible textural colorations which re- back technology as well. sult, while still allowing variable pitch Yet, our size is so inversely pro- in 1Hz increments without defeating portional to the number of QL-10's we the quartz monitoring circuitry. can laboratory fabricate that it may The JVC Cutting Stylus. To com- very well be the rarest production plement our lathe drive system, we turntable on the market. A"spare- :eason discs from labels like developed a special cutting stylus no-expense" indulgence enabled by elarc and Mobile Fidelity sound made from solid diamond, a first in our sheer size! ood is also the reason JVC's finest the industry. The stylus has an ex- The Selected JVC Dealer. We ited production turntable and car- tremely sharp cutting point (one mi- invite you to audition the QL-10 and idge are showing up in prestigious cron radius) with highly polished MC -1 alongside the best turntables salons alongside Winn, Linn-Sondek, facets. The result is extended high and cartridges in the world. While Denon and Coetsu: JVC research. frequency response, better definition subjective comparisons are inappro- The JVC Lathe Drive. At our and reduction in distortion and sur- priate for us, you are free to test our Cutting Center in California, we dis- face noise. somewhat bold assertions at selected covered that even in a state-of-the- The JVC Cartridge. The MC -1 audio salons across the U.S. art mastering lathe, such as the moving coil cartridge brings an If you feel you'd appreciate such Neumann, its turntable revolution is equally fresh approach to playback. a comparison-and the price hand - slowed slightly when cutting deep Instead of a cumbersome coil, the built technology demands- call us for grooves, an effect considerably mag- MC -1 employs a tiny "printed circuit" the location of your nearest JVC nified by the demands of digital mas- weighing less than 1/100th of a typical Professional Audio Representative. ters and half-speed mastering. wound inductor, enabling it to be Then call or write Vic Pacor, Pro This hesitation of even the mas- placed considerably ahead of the Audio Sales Manager, who is person- sive Neumann platter- and the re- pivot, just millimeters from the ally interested to hear how you feel sulting wow- were corrected with a diamond Shibata stylus. about our assertion that being the JVC logic -controlled DC drive motor Reductions in cantilever whip- undisputed leaders 61 mastering which assesses its rotational speed ping, ringing, resonances and technology will ensure our future five thousand times per second, and crosst k have led us to the conclu- leadership in disc transcription, too. courzfeibwery -coryale

i. edged cornpreadi4of -collar fur rcgidity ed headaitea materi.cf ¡eat"; (.? .pHz 2), íriáion free uzipw unnmmmí2íimiwommrn.,,,,... I eucE/ctA cor ted 'no -cog ,7 coreZi?:DGrnotor. pa4 aild neeve servosydtem verticaL tradkung cu2gJ- actuar,neytrii//l<< JVC 58-75 QUEENS MIDTOWN EXPRESSWAY, MASPETH, N.Y. TELEPHONE:(212) 476-8300 Enter No. 21 on Reader Service Card Sansui Tut, Model TU-. tuner that inclu tuning as well Through the use reference oscillator, I try automatically lockeereo station. A station will ss.. even if the tuning knob is . bumped because of patenteL recting circuitry. Distortion is sF at 0.03 percent in mono and 0.0:. cent in stereo, with S/N at 86 dB . capture ratio at 0.8 dB. The unit's lb sensitivity is 1.5 NV. Price: $585.00. Enter No. 101 on Reader Service Card

Audio Electronic Systems dome tweeter. Stated nominal im- Hegeman Loudspeaker pedance is 4 ohms, recommended Preamp/Control Unit Model AES 50T is a floor-standing, amp power is from 50 to 125 W rms, Model HAPI Two, for relay rack three-way air suspension system frequency response is from 25 Hz to 20 mounting, uses op -amp techniques weighing 100 lbs. It features four kHz, and crossovers are at 600 Hz and with flat gain and passive equalization speakers: a 12 -in. woofer, two 2 -in. soft 2 kHz. Price: $399.00. to assure equal time delay from all ele- 28 dome midranges, a 1 and -in. soft Enter No. 100 on Reader Service Card ments in the musical spectrum. In the preamp section, gain and transient response are controlled over a spectrum 10 times the nominal bandwidth of

20 Hz to 20 kHz. The control section includes selection of three high-level inputs, gain and balance controls, and mode selection for either channel. Also provided are tape monitor, loudness compensation, rumble filter, and time delay. Price: $900.00. Enter No. 102 on Reader Service Card

Custom Audio Electronics Gooseneck Lamps Littlites illuminate audio components and control panels in dimly lit areas. Offered with a black finish in 6-, 12-, and 18 -inch lengths, the lamps have bayonet -type bulbs and 360 -degree swivel bases (detachable for storage). Various mounting brackets, power supplies, and dimmer controls are available. Prices: $15.30 to $19.65, plus accessories. Enter No. 103 on Reader Service Card Koss small club, theater, concert hall, or Digital Delay System auditorium. An EQ switch for signal Model K/4DS utilizes a patented balance and an isolated stereophone single -circuit conversion unit capable function with twin jacks and stereo- of storing nearly 17,000 bits of infor- phone amps are also included. Price: mation. Switchable settings allow the $500.00, with 15-watt/channel ampli- user to recreate the ambience of a fier. Enter No. 104 on Reader Service Card

Polk Audio midrange drivers and the moving -coil Loudspeaker System soft dome tweeter. A fourth -order Model R.T.A. (Real -Time Array) 12 acoustic crossover is between the bass was designed to create an acoustic midrange drivers and the molded transducer system capable of recreat- foam subwoofer. Impedance is speci- ing live musical experiences in listen- fied at 6 ohms with a frequency re- ing rooms at 120 -dB levels and above. sponse of 27 Hz to 20.5 kHz, ±2dB. It is a three-way system with a com- Recommended amplifier power is 10 puter -derived fourth -order electrical to 500 watts/channel. Price: $374.95. filter network between the two bass Enter No. 105 on Reader Service Card 29

Bang & Olufsen Cassette Recorder The Beocord 1900, a compact cassette deck with two heads, accepts metal -particle tape. The cassette tray is located on the top of the unit, and touch controls and push buttons have been placed on an angled front panel tape counter. Spec- for easy access. Microphone input and ified frequency response channel balance controls are housed is 30 Hz to 15 kHz, with wow beneath a sliding panel adjacent to the and flutter at 0.15 percent W main controls; additional features in- rms. Price: $495.00. clude illuminated VU meters and a Enter No. 106 on Reader Service Card

AUDIO January 1980 Of the Listener, By the listener, bania), All India Radio, and Voice of And For the listener Vietnam. This is undesirable, making Dear Editor: reception very difficult not only in the I have read with interest Lawrence countries where the signals are being D. Swift's letter in Forum on p. 6 of the jammed but also in areas many miles May, 1979, issue of Audio and Curtiss away. Such practices should be R. Schafer's Letter to the Editor in the stopped since it is the listener who July, 1979, issue. Being a DX -er (one should decide if he wants to hear who listens to distant radio signals) of these broadcasts or not. both medium -wave (AM broadcast William Dang

band) and short-wave signals, I would Calgary, Alberta like to give my view on the matters. Canada Regarding the AM clear -channel proposal, while the FCC proposal does Errata not me as strike deliberate jamming of In the "Equipment Profile" of the Canadian and Mexican medium -wave Ortofon MC -30 moving -coil cartridge signals, it will act to severely clutter up in the November issue, Fig. 2 was in- the band and cause problems for both correct. Herewith, the correct chart, those who DX and those who regularly showing left -channel frequency re- The Snell Type A listen to clear -channel stations. sponse and separation of the MC -30: Flat power response Mr. Swift gave the example of sta- and flat early arrival re- tion WWL interfering with WKAR. Up 30 sponse here in Calgary, the same thing hap- Freedom from room boundary interference pens. CHRB, a 10,000 -watt station in effects High River, Alberta, is interfered with Near total elimination of by KTLK, a 5,000 -watt station in Den- diffraction delayed ver, Colorado. signals Correct reconstruction Medium -wave signals are also capa- sae of spatial information ble of crossing oceans. Europe and Af- -con- through frequency rica can be heard, as well as Australia stant ratio of early 100 1k 10k 20k arrival and reverberant and New Zealand, when conditions FREQUENCY -N sounds are right. Some countries operate ex- The following photograph is the Optional bi-amplifcation ternal radio services to neighboring of with Snell Acoustics Bauman Research Pro -400 stereo countries on medium wave, such as Electronic Crossover preamplifier, reviewed in Britain's BBC and All India Radio. the Novem- Extremely wide dynamic ber issue: range Trans World Radio operates a 500,000 - The Snell Acoustics Type watt station on Bonaire in the Nether- A Loudspeaker is designed lands Antilles. Their signal coverage placement for convenient extends up the East Coast of the U.S. near a rear or side wall so as to control room boundary into Canada, and far into South Ameri- reflections and augment ca. Radio Nacional of Venezuela has bass performance. Individ- acquired a million -watt medium -wave of crossovers to ual tuning transmitter and plans to use it for in- drivers in each speaker, together with exhaustive test- ternational broadcast in several lan- ing Including listening com- guages. It should have no trouble get- For the "Workbench Profile" of the parisons with our reference ting into the U.S. and parts of Canada Crown RTA-2 real-time analyzer, also Type A result in closer if its is I quality/performance toler- frequency clear. Thus, am op- in the November issue, the captions ances than are obtainable posed to the FCC proposal as it would for Figs. 3, 4, and 5 should read: through large scale assem- cause severe congestion of the medi- Fig. 3 - Response to a 500 -Hz tone. bly line production. um -wave broadcast band and would (Vertical scale: 10 dB/div.) The theoretical benefits also cause reception problems for lis- Fig. 4 Tape recorder setup. Top: Re- of the 5 year development of - the Type A can be examined teners in neighboring countries. sponse before head alignment. Mid- in more detail by requesting As for short wave, I have experi- dle: After alignment, but before bias our brochure, or experienced interference as described by Mr. and EQ adjustment. Bottom: After ad- enced directly by an audition at one of our dealers. Schafer. While I don't have a direc- justing bias and EQ. (Vertical scale: 5 tional antenna and don't know the ori- dB/div.) Snell Acoustics gin of the interference, stations in- Fig. 5 - Display of sound -system re- 10 Prince Place, Newburyport, MA terfered with include Radio Tirana (Al- sponse. (Vertical scale: 10 dB/div.) 01950 617-462-3194 AUDIO January 1980 Distributed in Canada by Esoteric Audio Systems, Milliken, Ontario Enter No. 40 on Reader Service Card 4 G2 Ñ [P) ate nted) ( Pate tt Pe nq) Two of the most important new words in tape recording Problem: Problem: Traditionally, tape recorder electronics have had insuffi- High frequency limitations inherent in the cassette (i.e., cient headroom to fully exploit the greater performance low speed) medium. Tandberg engineers have developed capability of the new high coercivity tapes, such as metal an exclusive, Patent -pending circuit that is not just a techni- tape. The goal of Tandberg engineers was to improve the cal refinement, but a fundamentally new approach to the headroom of tape recorder electronics by 18-20 dB so it can matter. be used with metal tape. Whereas ACTILINEAR overcomes the limitations of elec- The +ciflL INEA R Cire uR -hq DY hEa C Irc uit Bias Osc Record 90kHz S E Ua IRetton F Am ou Iter E al zabon . m. l er Corn erter aesord LOA Lede) FMG H ad Network fo Freeluencv qualizatlOn Caltrollei

Cause: ronics at any speed, DYNEQ overcomes tape limitations at In conventional recording systems the summation of ow speeds. record & bias current in the record head is done through pas- High frequency saturation (overload) is of particular impor- sive components, leading to compromise solutions which tance with today's new direct -to -disc and digitally -mastered have their distinct and pronounced weaknesses-primarily a recordings as they deliver more energy in the high frequency limited headroom for the signal. range than ever before. Ccnven,tlonal vs. AC'IUNEAR Headroom Cause: The high frequency overload-i.e., "the cassette sound" CI we -of which tape recording purists complain is not simply a Dl.tortlon question of reaching a point where the tape can hold no more Increase A meal signal. At high frequencies, excessive input levels not only i Headroun A produce enormous amounts of distortion, but actually lower the signal level played back from the tape. In AC TIL NE AR other words, epctrOnlCa once you have reached the saturation point on the tape, the Headroom more you J signal try to put in, the less you actually get out. bonveil nad Etectmn a C onvertlonal vs. DYNE. a Le re Is at Tiva H igh F reso+ e{1oi es 5 _ _ Headroom dB 10- `110rnz \ w th DYNEO Ircreasa Conventional I tr booed na 15 Head oom V CI piling DMortiur tr Ib

25 -2 D -1 b -1D o Input d B Solution: Solution: Tandberg engineers developed & patented a new record- If, just at the point where high frequency saturation (over- ing technology without these compromise solutions (See load) begins to occur, you could automatically lower the curves above). In the new ACTILINEAR system, featured in amount of record treble boost supplied by the equalization our TD 20A open reel and TCD 340A & TCD 440A cassette circuit, you could increase the high frequency output of which recorders, the passive components have been replaced with the tape is capable, and drastically lower high frequency dis- an active Transconductance amplifier. Among the benefits of tortion (See curves above). In brief, this is precisely what this new recording system are: Tandberg's exclusive new dynamic equalization circuit does. Up to 20 dB more headroom. Less Intermodulation due to Slew Rate limitation. Yet another benefit is that the DYNEQ circuit, featured exc- Improved electrical separation and less interference be- lusively in Tandberg's TCD 440A cassette deck, not only tween bias oscillator and record amplifier. gives improved performance with the new metal particle No obsolescence factor-usable with any type of tape cassettes, but also delivers a significant improvement in per- available now or in the years to come. formance with today's better premium tapes.

I ' í I '-' 4 s ITF I"\1,WITtTr 111011A4416 ÿ

Setting th- sta dare s i tapa n . r r. ng f r r r ver 50 ears Ô ®.ñ_ D pA I t,D a4aA I I Perhaps the most important word in tape recording. Tandberg of America, Inc., Labriola Court, Armonk, NY 10504.

Enter No. 49 on Reader Service Card Each year, despite mailings, telegrams, and telephone calls, we are unable to make contact with a number of manufac- :1G1il&11 turers, so that their equipment does not receive a listing in. our October Annual Equipment or July Car Stereo Directo- ries. The reasons for this are varied, e.g. changes of personnel ÇIPMJÌ or facility location, Directory forms lost in the mail, etc. Our experience indicates that we must not list data from the previous Directory, as it is almost certainly outdated, and that to attempt to make up data from our files would lead to further t1thÌO RJ error. Thus, we present the Addenda to our Directories.

A R.T. Bozak E M S ADS P.O. Box 1166 Evadin Magnepan, Inc. Sanyo Darien, Conn. 06820 1 Progress Way See: TZL International 1645 Ninth St. P.O. Box 51777 Wilmington, Mass. 01887 White Bear Lake, Minn. Compton, Cal. 90220 Bryston Mfg. 55110 R.F.D. 4, Berlin Sherwood AIKO F Montpelier, Vt. 05602 Marantz 8116 Deering Ave. See: TZL International Fisher Corp. Park, Cal. 91304 20525 Nordhoff St. Canoga 21314 Lassen St. (Note: firm moved Chatsworth, Cal. 91311 This C Chatsworth, Cal. 91311 since the Oct. Directory) Adcom Canton 11A Jules La. See: Adcom Mayware N.J. 08901 G Sonax New Brunswick, 15 Heather Walk General Sound Edgware See: Anglo-American 2334 N. 32nd St. Audio Audio Clarion Corp. Middlesex HA8 9TS Anglo-American Phoenix, Ariz. 85010 P.O. Box 653 5500 Rosecrans Ave. England Buffalo, N.Y. 14240 Lawndale, Cal. 90260 Sound Source Genesis Physics Corp. Meridian 1435 Jacqueline Dr. Columbus, Ga. 31907 Audio Electronic Systems Consortium of British Newington Park See: Anglo-American 101 N. Park St. Audio Newington, N.H. 03801 Audio East Orange, N.J. 07017 652 Glenbrook Rd. Stanton Magnetics Stamford, Conn. 06906 Grundig Electronic Corp. Keith Monks Audio Ltd. 175 Terminal Dr. Plainview, N.Y. 11803 AudioMobile 635 Madison Ave. See: Consortium of Div., Avnet Craig Corp. New York, N.Y. 10022 British Audio 3221 W. MacArthur Blvd. 921 W. Artesia Blvd. T 32 Santa Ana, Cal. 92704 Compton, Cal. 90220 H N TZL International Hartley Products Neal-Ferrograph 2020 W. 16th St. Avid Corp. Custom Craft 620 Island Rd. III. 60153 See: of Broadview, 10 Tripps La. 819 Kraemer Blvd. Ramsey, N.J. 07446 Consortium Audio East Providence, R.I.02914 Placentia, Cal. 92670 British Tusk Speaker Co. L P Suite A-22 B D LS R & D 1760 Monrovia St. Belles Research Corp. Dimension 100 Hiawatha Dr. Philmore Mfg. Costa Mesa, Calif. 92627 40 INIP Dr. P.O. Box 65 See: Custom Craft Mt. Pleasant, Mich. 48858 N.Y. 11696 East Rochester, N.Y. 14445 Inwood, Z Lirpa Labs Pyle Bose Corp. Dynaco, Inc. Corner of Main & Elm Industries Zenith Radio Corp. 100 The Mountain Rd. 110 Shawmut Rd. Anytown, U.S.A. 501 Center St. 1000 Milwaukee Ave. Ind. 46750 Framingham, Mass. 01701 Canton, Mass. 02021 483712260 Huntington, Glenview, III. 60025

At Audio Research our only business is providing the highest definition in music reproduction. \* On the following 11 pages you will find our major 2 Moving Coil Pre -preamplifiers: products, followed by our authorized dealer list- 1 Solid State: MCP -2 ing. Each of these products represents a serious effort 1 Vacuum Tube: MCP -22 to provide two things sound quality and construction - shown on some of the products on quality. We do not offer one or two "state-of-the-art prod- Note: The wood cabinets the following pages are optional extra cost accessories. ucts" in order to merchandise some less costly products. No, at Audio Research, quality is our only business, and each of If you desire more information about any of these products a these prodùcts is constructed without compromise with qual- detailed specification sheet is available upon request. ity, each offering different features and/or application. Write: 5 Power Amplifiers: Dept. A Research Corporation 4 Solid State: D52B, D100B, D110B, D350B Audio Box 6003 1 Vacuum Tube: D79 Minneapolis, MN 55406 1 Electronic Crossover: EC -22 (Vacuum Tube) 3 Preamplifier/Stereo Control Units: audio research 2 Solid State: SP-4A, SP -5 1 Vacuum Tube: SP -6A

Enter No. 6 on Reader Service Card MANUFACTURER

BRYSTON MFG. 1B 1-150 9 0.001 0.001 0.001 150 85 No 20

MERIDIAN 101 5-50 0.01 0.01 0.01 1.4 160 80 0.45 No 100 47 Yes 4 485.00 ±0.5 11S Letter Code

"F" indicates FM only; "K" indicates kit price

MANUFACTURER

MERIDAN 104 2.5 22 1.0 22 50 50 0.1/0.2 67 No 4 555.00 JSSIDSIS

Letter Key: J "F" indicates FM only c} "K" indicates KK s ¿ÇÇ `e,,P ,.Pte ° LL1' ,` cP_ ¡4Q C.. 4` ` i + tr° \\6, d'" 1\a0` J`°8 04 \ `' 4 t}° r .fi ,aF \ 60 yv ly° ,o+'\. í ,, 4 c° G p" ' gfa ,A cfc q \ cp', a0' ' °\ ...i e ' ed° 5. _es,*s `° Fp F,`. 4°t 0° . 33 p,1,0 ,si` Q°°,Fv" \y.,a W `660` `°Q e0Ci1 1' 0 : .0 6't 00) .e .° G,pec.?°4' g\' J\ P,, °l `1`"í 5 e ,\ J l ,,,,/- e+' e\ aM °' 9`

FISHER MC2500 F 18 1.0 60-20 100 2.8/14.1 5.5/20.0 5.0/19.2 45.0/38.3 50 65/60 15 229.95 RS1035A F 35 0.2 20-20 75 110 1.9/10.8 4.6/18.5 1.0 2.8/14.2 38.0/36.8 0.3/0.4 68 70/66 22.9 299.95 RS2002 F 20 0.09 2020 76 1.9/10.8 4.6/18.5 1.0 2.8/14.2 38.0/36.8 0.15/0.2 68 70/66 17.9 279.95 RS2003 F 30 0.04 20-20 76 1.9/10.8 4.6/18.5 1.0 2.8/14.2 38.0/36.8 0.15/0.2 68 70/66 21 379.95 RS2004A F 45 0.04 20.20 76 150 1.9/10.8 4.6/18.5 1.0 2.8/14.2 38.0/36.8 0.15/0.2 68 70/66 28.5 429.95 R52007 F 75 0.03 20-20 180 1.7/9.8 4.3/17.9 2.5/13.2 34.0/35.9 75 75/70 31 549.95 RS1058 F 90 0.1 20-20 180 1.7/9.8 4.3/17.9 2.5/13.2 34.0/35.9 75 75/70 32.4 549.95 RS2010 F 100 0.03 20-20 76 200 1.7/9.8 4.3/17.9 0.8 2.5/13.2 34.0/35.9 0.1/0.2 80 75/70 36 699.95 RS2015 F 150 0.03 2020 72 220 1.7/9.8 4.3/17.9 0.8 2.5/13.2 34.0/35.9 0.1/0.2 80 75/70 52 899.95

ZENITH MC7051 40 0.05 0.05 20-20 81 125 1.4 1.8/10.3 5.5/20 1.0 3/14.7 40/37.2 0.3/0.5 70 70/65 27.50 359.95 MC7041 25 0.08 0.08 20-20 76 125 1.2 1.9/10.7 6.0/20.7 1.0 4/17.2 50/39.2 0.3/0.5 60 70/65 19.58 279.95 MC7030 15 0.4 0.4 2020 71 125 2.0 1.9/10.7 6.0/20.7 1.0 4/17.2 50/39.2 0.3/0.5 60 70/65 19.36 229.95

The High Definition® Approach

In photography, it is the razor-sharp resolution and faithful adherence to hues, tones, anc shadings of the subject. In music, it is the strict re-creation of musical transients and subtle tonal structures which give the listener the sensation of "listening through" a music system to the "live" performance. At Audio Research this is our ONLY business - providing the highest definition in music reproduction.

D -52B High Definition® Power Amplifier Our smallest wattage amplifier - but of the very highest sound quality for music systems where its power is adequate. Recommended especially for multiway speakers with bi -amplification as well as for the many small high quality speaker systems available. Rated 50 watts RMS per channel Near "Class A" performance audio research (180 mode - 8 watts mono ohms) 80 joule energy storage 2843 -26th AVE. SO. Internal Impedance .012 ohm power supply MINNEAPOLIS, MINN. 55406

Enter No. 6 on Reader Service Card LETTER CODE FOR SPEEDS 13,df A--33,45,78 cF es. qF+. ,e? .ti .FPS `$'e ° ° \ßt4,°' B--33, 45 de 1L apQá1eb C3, only dp41 rt P Pe ^ 1 v e D-16, 33, 45, 78 -y * 06' 4<:`° be L_ ,e- O 4- G' O. F, a c° G° a ,.li Peo +, ei 4 .f `P o e d teet E-16,33, «. ò`oi Q1 .,4- P P e yeel. A.(' e ,,pOI (`« r Cont. variable ! e G G t t, re °' \t j .4«") MANUFACTURE T 4.-e 1° e I itz D,e $49.49.0 %e+ of ,,e oe` Qed

FISHER MT6115 B 0.08 55 4 -Pole Belt 1 7.6 No 0 3 Yes 0.7-3.5 Yes 17%x133/4:51/2 119.95 A.C. Sync MT 6310 B 0.04 68 D.C. Servo Belt 0.8 3 Strobe 8.7 No 0 2.0 Yes 0.6-3.5 Yes 171/2)(141/2 :6 119.95 MT 6211 B 0.05 60 D.C. Servo Belt 0.8 3 Strobe 8.7 No 0 2.0 Yes 0.6-3.5 Yes 17 %x14'/.x5' 149.95 MT 6320 B 0.035 68 D.C. Servo Direct 0.5 3 Strobe 8.7 No 0 1.8 Yes 0.63.5 Yes 17'/2x141/2x6 169.95 MT6330 B 0.035 70 120-Pole Direct 0.5 3 Strobe 8.7 No 0 1.8 Yee 0.6-3.5 Yes 171/2x141/2x6 189.95 A.C. Servo MT6224 B 0.04 68 120-Pole Direct 0.5 3 Strobe 8.7 No 0 1.8 Yes 0.6-3.5 Yes 172%x141/4x6 199.95 A.C. Servo MT6225A B 0.03 70 120 -Pole Direct 0.5 3 Strobe 8.7 No 0 1.5 Yes 0.6-3.5 Yes 17 %x14'/ x6 249.95 A.C. Servo MT6335 B 0.035 70 120 -Pole Direct 6 Strobe 8.7 No 0 1.5 Yes 0.6-3.5 Yes 17'4x14'/2,6 249.95 A.C. Servo MT 6250 B 0.03 70 120 -Pole Direct 6 Strobe 8.7 No 0 1.5 Yes 0.6-3.5 Yes 173/4 x14'/.x6'/: 300.00 Quart:

SONAX 500/10 B 0.04 60 24 -Pole Belt 0.02 No No 17x13x5'/, 295.00 Hye.Sync. 100 B 0.04 60 24 -Pole Belt 0.02 No 111/2 9% No 0 1.5 Yes 14-4 Yes 17x13x51/2 395.00 Hys. Sync.

STANTON 8005A B 0.07 70 24 -Pole Belt 0.3 1.7 Yes 04 Yes 167/ex131/2x61/4 300.00, Sync. Cart. Opt.

ZENITH MC9050 8 0.03 70 D.C. Direct 3 Strobe 11'/2 8'/ 0 1.5 Yes 0-4 Yes 6x19x15 249.95 Servo MC9035 B 0.08 60 24 -Pole Belt 2.9 3 Strobe 91/4 71/2 Yes 0 2 Yes 0-4 Yes 7x16,15 139.95 Sync. MC9030 B 0.20 50 4-Pole Belt 2.9 91/2 71/2 Yes 0 2 Yes 04 Yes 7x16x14 149.95 Induc. MC9025 B 0.08 60 24-Pole Belt 2.9 9% 71/2 Yes 0 2 Yes 0.4 Yes 7x16,15 109.95 MC9020 A 0.28 46 4-Pole Rim 2.9 91/4 71/4 Yes 0 2 Yes 0-5 Yes 8x16,15 99.95 Induc.

34 e

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MAGNEPAN Unitrac 1 11.41 9.5 Yes Yes Yes 1.77 Yes 110 3-12 Unlpivot 295.00

MAYWARE Formula4 11 9 Yee Yes Yes Yes 0-3 118 2-11 Unlpivot Unipivot 175.00 MK Ill

KEITH MONKS M9 BA Mk3 111/2 9 Yes Yes No No 1/2-21/2 80 3-8 Unipivot Unipivot 197.95 No wires through pivot point. AUDIO

The Quality Approach

Audio Research products are built FOR perfectionists, BY perfectionists. Basic to the nature of a perfectionist is a love for quality, whether it be in fine automobiles, cameras, or music systems. Simple appreciation of a quality built product can be very satisfying. The extra measure of enjoyment in ownership of an Audio Research product comes from the knowledge that you own a component that not only represents the "state-of-the-art" in music reproduction, but also the "state-of-the-art" in construction quality. IL. D-1006 High Definition® Power Amplifier Rated 100 watts RMS per channel D -100B (360 watts mono mode - 8 ohms) 75 joule energy storage power supply The D -100B shares with all Audio Research amplifiers total stability to drive any kind of load - from electrostatic speaker to induction motor - with audio research complete stability. Built to continuous commercial service standards. Sec- 2843 -26th AVE. SO. ond generation Analog Module® Technology. MINNEAPOLIS, MINN. 55406

Enter No. 6 on Reader Service Card LETTER CODE FOR STYLUS TYPE C --Conical S-Spherical E-Elliptical Q --For CD -4 use (Shibata, etc.)

MANUFACTURER

MAYWARE MC -2C 10-50 MC Yes 25 0.2 1.8- 47k C Fact. 150.00 75.00 Titanium can 2.2 Meyer.

Letter Key: K = kit; W = wired; e y1`+ T = tube; P = phone stage only; `00 +moo e+! M = mono. pi-'op `o a .ts Qei° a. F \6 e ee o` ms 0 Oe,e,'J s`Qe e 0' ee ° t\ Q,se, 4'4' ,t0 erQ e Pre Pd°Q 4 r`e e CrQ` P P e oFQ o F+e Joe`c s ,e' Qa Qa Qßí. 4° MANUFACTURER ,ro N°. Q 9e ale Jj G Ooa V'e

BRYSTON MFG. 2B B 50 20-20 0.01 0.01 0.01 60 AB 6 20 525.00 200 watts mono. 3B B 100 20.20 0.01 0.01 0.01 60 AB 6 38 900.00 As above. 48 B 200 20.20 0.01 0.01 0.01 60 AB 6 55 1,400.00 800 watts mono.

FISHER CA2120 I 35 20.20 0.02 0.02 80 2.5 230 0.15 AB 20 5 -band graphic EG, power meters. CA2220 I 50 20-20 0.02 0.02 80 2.5 230 0.15 AB 22 As above. CA2320 I 60 20-20 0.02 0.02 80 2.5 230 0.15 AB 20 Moving coil phono input. CA2420 I 80 20-20 0.02 0.02 80 2.5 230 0.15 AB 24 As above, with 5-band graphic EC and power meters.

LS R&D The Leach Amp B 160 20-20 0.1 0.1 0.1 70 1.8 AB No 40 799.00

MERIDAN 103 B 35 20-20 0.1 0.1 0.1 90 12.3 485.00 103D B 45 20-20 0.1 0.1 0.1 90 26 699.00 105 8, M 100 20-20 0.1 0.1 0.1 90 13 449.00 35

MANUFACTURER

NEAL- Electrostatic ES 20-20 130k 95 9.9 F 13 134.00 With adaptor boo and carrying case. FERROGRAPH ±3 Dyne-% Dyn. 20-20 120 9.9 F 13 64.00 With carrying case. S5

The Musical Approach !

High Definition® music reproduction is accomplished by a design approach that considers, first and foremost, the complex, constantly changing phenomera of musical waveforms. The musical approach requires designs which go beyond good "static" specifications to perform in actual use - music reproduction. Audio Research products have good "static" specifications which exceed the specifications of many competitive products. However, it is the musical approach in Audio Research products that sets them apart. The musical approach gives Audio Research products a hard -to -define, elusive, musical quality which is difficult to measure but easy to hear. D-1106 High Definition® Power Amplifier Rated 110 watts RMS per channel (440 watts mono mode -8 ohms) 300 joule energy storage power supply The D -110B - a combination of the D -100B circuitry with the D-35DB audio research power supply - rebiased to higher operating current and fan cooled, 2843 -26th AVE. SO. provides the highest possible measure of musical quality. MINNEAPOLIS, MINN. 55406

Enter No. 6 on Reader Service Card 1 Q F d° ° 0c dn ` \9/ iQ,t, d,°'d- cc cPá° Qr`°W' ,3,,0` ° ,0 / ,o.. cFov e .F \Fo p , g joA° ya cpcd .°4 W .° Q1/4*6 MANUFACTURER + \a Nt ,bl

ZENITH 839-32 Dyn. 20.19 8 104 500 10 C 11 49.75 ±3 839-49 Dyn. 20-18 8 110 200 61/2 F 11 23.75 ±3 83950 Dyn. 20-20 8 108 200 61/2 F 12 47.95 ±3 839-52 Dyn. 20.20 8 90 700 10 C 16 53.25 ±3 839-54 Dyn. 20-16 8 100 300 9 C 13 54.25 ±3 839-55 Dyn. 30-18 8 90 200 10 C 8 26.50 ±3 83956 Dyn. 10-25 8 100 300 8 F 13 74.95 ±3 S'AQUSSI

LETTER CODE FOR SPEEDS A-7%, 3%,1% 8-7%, 3% C-7'%,3%,1%,15/16 D-1% E-15, 7%, 3% F-15, 7% G-15, 71/2, 3%, 1% H-15/16

NEAL- Logic 7 E 10% 3 2or 2 3 Sync. Stepped 20-20 0.08 60 1.27V Yes Yes 200- 2 VU 20'/.x17'h 58 1,950.00 Cont. var. wind con- FERROGRAPH 4 Idler ±2 1k Mtrs. x10 trol, record cancel, opt. remote control; opt. power amps and speakers, 300.00; opt. Dolby NR, 400.00. 36

MANUFACTURER

FISHER CR 5120 X Yee 30-17 F 3 0.05 53 62 3 No Yes Yes Yes Yes 171/4x121/2063b 22.5 349.95 CR 4028 X Yes 30-16 2 0.07 52 62 4 No Yes No No No 171/2x12%x4% 17 349.95 2 speed, auto search. (Continued) 30-23 0.06 Specs. here, 3/ es.

The Common Approach

All Audio Research components share a number of things in common. For example, all have heavy gauge two color anodized aluminum front panels for lasting durability and beauty. Most small parts (capacitors, resistors, transistors, etc.) are selected from quality Ameri- can vendors for availability and reliability - and of course, all are used at conservative levels to assure long life. The D -350B High Definition® Power Amplifier Rated 350 watts RMS per channel -8 ohms (more than 1 KW total into 4 ohms) 300 joule energy storage power supply Speaker line fuses Logic circuitry with relay for added protection against subsonic or DC output. audio research 2843 -26th AVE. SO. MINNEAPOLIS. MINN. 55406

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vP oc e 1d° .cel o . ,. c., ò ° ,se . aP cP .xxF aye QaJ Qe! oe y4' cP' \C ee`e eye ogac r\oe p e al \e° eO ee " e''.4.4" , oax ò0 e ,cps * ,o° , .0 iio of ?' Fec ice mee MANUFACTURER 9.Jo o ? of C°e cf F eF eow

FISHER CR 4031 X Yes 30-16 F 2 0.07 52 62 4 No Ves No No No 171/4x121/2x4% 17 349.95 As Model 4028. (Continued) CR 30-23 0.06 Specs. here, 3% Ips. CR 5125 X Yes 30-18 F 3 0.04 55 64 3 No Yes No No Yes 171/4x121/4x4% 22.5 499.95 Wireless remote ±3 editing. CR4029 X Yes 30-18 F 3 0.06 52 62 4 No Yes Yes No Yes 12'/x1214x4% 17 499.95 2 speeds, bias fine adj. 30-25 0.05 Specs. here, 3% Ips. CR 5150 X Yes 30-18 F 3 0.04 55 64 3 No Yes Yes No Yes 141/4x11%x5'/, 22.5 699.95 Remote control, ±3 clock/timer. CR4015 X Yes 40-13 F 2 0.09 50 56 2 No Yes No No No 15x81/4x5% 12 149.95 ±3 4013 X CR Yes 4012 F 2 0.1 48 58 2 No Yes No No No 5'/ x15'/xx9 16 169.95 LED level meters. Y3 CR4025 X Yes 40-14 F 2 0.09 50 56 2 No Yes No No No 15'/ex11%x6 13 199.95 Wireless remote ±3 editing. CR 4016 X Yes 40-14 F 2 0.1 50 60 2 No Yes No No No 51/4x171/4x91/4 16 249.95 2 speeds. 40-18 0.09 Specs. here, 3% ips. CR5115 X Yes 30-16 F 3 0.07 52 60 3 No Yes Yes No No 16%x11%x6% 13 279.95 ±3 CR 4027 X Yes 30-15 F 2 0.08 52 62 3 No Yes No No No 299.95 2 speeds. 30-20 0.07 Specs. here, 3% ips. ER 8115 8 No 35-11 F 2 0.15 48 1 No Yes No No No 12%x10'/ x5 8.2 169.95 ±3 ER 8130 8 No 35- F 2 0.15 44 52 1 2 Yes No No No 14%x10x5 8.5 179.95 2 speeds. 12.5 Specs. here, 3% ips. ER 8125 8 No 32-12 F 2 0.15 44 52 1 No Yes No No No 13%xlOx5 8.2 199.95 ±3 ER 8150 X Yes 40-12 F 2 0 0 50 56 1 No Yes No No No 20x103/4x6 14.5 329.95 8 track & cassette. ±3 8 No 0.15 46 52 ER 8155 X Yes 40-12 F 2 0.09 50 56 3 No Yes No No No 6x20x10% 14.5 369.95 As above. ±3

8 No 0.15 46 52 1

NEAL- 302 X Ves 35-15 F 2 0.09 55 64 2 Yes No No Yes 18x5%x9 18 995.00 Opt. remote control. FERROGRAPH +1-3

ZENITH MC9070 X Yes 30-15 F 2 0.08 52 62 3 No Yes No No Yes 17x9x6 16 249.95 ±3 37

MANUFACTURER

PHILMORE DC200 Sup. Card. Elect. Cond 600 30-15 -60 20f Phone 6 %x32 t Also with 3 -ft. curly, '/e -In. plug.

-- A "Last Generation" Product This special product, a vacaum tube power amplifier, represents the state-of-the-art of this technology. It is expensive and will be available only in limited quantity for a reasonable period of time. The D79 was conceived in response to demand from and for audio perfectionists. While it is not necessarily the "ultimate" amplifier, and will not provide its intr nsic performance with all speaker systems, it will provide a new standard of what we at Audio Research Corporation call Higl- Definition'" reproduction of music within its power capability throughout much of the audio range when used with suitable speaker systems.

The D79 Amplifier Rated 75 watts RMS per channel - 4, 8 or 16 ohms 550 joule energy storage power supply audio research quality 2843 -26th AVE. SO. Near military construction MINNEAPOLIS, MINN. 55406

Enter No. 6 on Reader Service Card \°

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AUDIO AES28 Base Ref. 8 2 Cone 5615 92 5 1.5k 8 101/4x20 Wal. Cloth, 141/4 ELECTRONIC 09% Vin. Blk. SYSTEMS AES 31 Bass Ref. 10 1'1 Soft 2 Cone 40-17 92 10 700,3k 8 13x23 Wal. Cloth, 35 Dome x10% Vin. Blk. AES 32 Ac. Sus. 12 11/4 Soft 2 Cone T 35-17 94 10 700,3k 8 14/x26 Wal. Cloth, 46 Dorne x111/4 Vin. Blk. AES 42 Ac. Sue. 12 11/4 Soft 1 Soft M,T 30-20 94 25 600,2k 4 15%x27 Wal. Cloth, 65 Dome Dome x111/4 Vin. 81k. AES 50 Ac. Sus. 12 (2) 2 Soft 1 Soft M,T 25-20 93 50 600,2k 4 160341/4 Wal. Cloth, 100 Domes Dome x11'/: Vin. Blk.

BELLES Belles 1 Pas. Rad. 8 1 Dome T 30-20 40 2.7k 8 15x17'/ Oil. Foam, 69 445.00 RESEARCH x33% Wal. Blk.

BOZAK LS200A Ported 8 1 Soft 60-20 10 1.5k 8 20'/.x Wal. 34 234.00 Dome ±3 11%x10% Vin. Pair LS250A Inf.Bal. 12 4 Cone 1 Soft 45-20 10 500, 8 23'4x Wal. 48 390.00 Dome ±3 2k 141/4x121/4 Vin. Pair LS400A Inf.Baf. 12 6 Cone 1 Soft 40-20 10 500, 8 251/4018 Wal. 65 600.00 Dome 2.5k x131/4 Pair CS501A Inf.Baf. 12 6 Cone (3)2 Cones 40-20 15 800, 8 32x20 Wal. 90 900.00 2.5k x16 Ven. Pair CS4000A Mf.Bal. (2)12 6 Cone (8)2 Cones 35-20 50 400, 8 44x27 Wal. 190 1,500.00 2.5k x16 Ven. Pair C53108 Inf.Baf. (4)12 (2)6 Cones (8)2 Cones 28-20 60 400, 8 52036 Wal. 225 2,500.00 2.5k019 Ven. Pair CS410CL Inf.Baf. (4)12 (2)6 Cones (8)2 Cones 28-20 60 4000, 8 52036 Wal. 225 2,,77 00.00 2.5k x19 Ven. Pair

DYNACO 8150 Ac. Sus. 10 1 Soft T 50-20 89 15 2k 8/6 121/4012% Wal. Cloth, 36 300.00 Dome ±3 022 Vin. Brn. Palr 8250 Ac. Sus. 10 3 Cone 1 Soft M, T 45-20 89 15 300, 5k 8/6 14'4x14'/. Oil. Cloth, 39 500.00 Dome ±3 x25 Wal. Brn. Pair A350 Pas. Rad. 10 3 Cone 1, Soft M, T 35-25 89 15 500, 3.5k, 8/6 140141/4 Oil. Cloth, 68 7800.00 4/5 Dome ±3 11.3k x43 Wal. Brn. Pair

FISHER MS145 Pas. Rad. 8 5 Cone 3 Cone 55-17 91 6.5 1k, 5k 8 241/4014% Wal. Cloth, 20 139.95 38 xl1 Vin. Brn. ST420 Pas. Rad. 8 3 Cone 50-16 90 3.5 5k 8 13%09% Wal. Cloth, 19 149.95 x21% Vin. Brn. ST430 Pas. Rad. 10 5 Cone 3 Cone 50-17 90 6.5 1k, 5k 8 16012% Wal. Cloth, 34 219.95 0251/4 Vin. Brn. ST440 Ported 12 5 Cone 3 Dome M,T 45-18 90 12 lk,5k 8 16012% Wal. Cloth, 36 279.95 0251/2 Vin. Brn. ST450 Ported 12 5 Cone 3 Dome M, T 45-20 91 20 1k, 5k 8 17014% Wal. Cloth, 44 329.95 x29% Vin. 8m. ST460 Ported 15 (2) 5 Cones 3 Horn M, T 40-20 92 25 1k, 5k 8 187.014% Wal. Cloth, 53 389.95 x29'. Vin. Brn.

GENERAL SOUND 421/422/ Ac. Sus. 4 1 Dome 125-20 86 10 2.5k 4 7%05'/e Opt. Cloth, 6 125.00 423 ±5 06% Opt. 521/522/ Ac. Sue. 5'/. 1 Dome 100-20 87 10 2.5k 4 9051/4 Cloth, 7 150.00 523 35 07% 631/632/ Ac. Sue. 6'/ 2'/. Cone 1 Dome 70-20 87 10 3.8k, 4 11%07% Opt. Cloth, 14 200.00 633 ±5 13k 07% Opt. 1011 Tuned 10 32-250 91 20 200 5.6 19018x18 Wal. Cloth, 54 350.00 Bass Port, ±5 Brn. Extender Satellite

How to Make the Best Speaker Systems Even Better Many of the current state-of-the-art speakers selectable crossover frequencies with 18 dB/Octave (Butter- have provision for using more than one amplifier. worth) slopes for the bass channel's two lowest frequencies By dividing the audio spectrum in two or more sections, (upper bass and all treble slopes are 6 dB/Octave) with semi - various combinations of improved speaker/amplifier per- precision level adjustment and other features for making this formance become possible. For example: product a most useful tool for audiophiles and music lovers. (1) A large amplifier can be used for bass response, together Available November 1979. with a smaller high quality amplifier for the treble. (2) Amplifiers of different gain/power specifications can be used together. (3) Speakers of different efficiencies can be used together. (4) Higher SPL's can be achieved. 11 (5) Lower system distortion can be possible from both the EC -22 improved amplifier performance as well as possible uleimaiele speaker network reduction. The EC -22 Electronic Crossover The EC -22 is a two-way state-of-the-art vacuum tube variable audio research frequency electronic crossover, featuring separate switch 2843 -26th AVE. SO. MINNEAPOLIS, MINN. 55406

Enter No. 6 on Reader Service Card ° eFQ se'''

GENESIS 3+ Pas. Rad. 610 4 Cone 1 Dome M,T 28-20 88.5 25 8063k 6 141/2x12 Opt. Knit, 52 389.00 ±3 x371/2 Brn.

2+ Pas. Rad. 8,10 1 Dome T 28-20 89 15 1.8k 8 141/2x10' Opt. Knit, 44 253.00 ±4 x351/2 Brn.

2 Pas. Rad. 8,10 1 Dome T 28-20 88.5 15 1.8k 8 14'/:x11'/, Opt. Knit, 37 207.00 ±4 x261/2 Brn. 147.00 1+ Ac. Sus. 8 1 Dome T 35-20 88 12 1.8k 8 121/2x9' Opt. Knit, 28 ±4 x22 Brn. 105.00 V-6 Vented 6 1 Dome No 52-20 88.5 10 1.8k 8 103/4x7 Wal. Knit, 18% ±4 x181/2 Grain Brn.

HARTLEY Zodiac Jr. Inf. Bat 8 2 Cone No 50-18 90 5 2.5k 8 111/2x7'/, Wal. Cloth, 221 96.00 PRODUCTS ±4 x19 Ven. Belge Zodiac 18 Inf. Bat 10 1 Dome No 40-25 92.5 5 2k 8 14%x8% Wal. Cloth, 32' 135.00 ±4 x21% Ven. Belge Zodiac '78 Inf. Bat 10 1 Dome No 35-25 92.5 5 2k 8 15x11% Wal. Cloth, 50 180.00 ±4 x30 Ven. Belge Concert Jr. Inf. Baf. 10 3 Cone 1 Dome No 25-25 90 15 5k 8/5 15x11% Wal. Cloth, 65 375.00 ±3 x38' Ven. Brn.

Holton Tower Inf. Bat. (2)10 3 Cone 1 Dome No 20.25 93.5 15 2k 4 20x14 Wal. Cloth, 105 495.00 ±3 x49'/: Ven. Brn. Concertmaster Inf. Bat. 18 10 Cone 1,7 Dome, No 15-25 91 25 250, 8/5 29x 18x411/4 Wei. Cloth, 150 1,380.00 Cone ±3 3k,7k Ven. Brn. Reference Inf. Bel. 24 10 Cone 7,1 Cone, No 16-25 91.5 25 250,3k, 8/5 38x24x501/4 Wal. Cloth, 300 1,725.00 Dome ±3 7k Ven. Brn.

421/4 495.00 MAGNEPAN MG I Bipolar 428 Planar 68 Planar 5616 87 40 2.4k 5 22x80x2 Oak Cloth, Sq. In. Strip Sq. In. Strip ±4 Ivory Pair MG II A Bipolar 500 Planar 68 Planar 4516 40 2.1k 6 22x71 x2 Oak Cloth, 50 825.00 Sq. In. Strip Sq. In. Strip ±4 Ivory Pair Tympani Bipolar 1026 Planar 96% Planar 40-20 100 4 (3) Oak Cloth, 80 1,395.00 1D Sq. In. Strip Sq. In. Strip ±3 72x16x1 Ivory Pair

191/2 NEAL- 523 Ac. Sus. 4 4 Cone 1 Dome 65-20 90 10 600 8/6 17%x71/2x11 Teak/ Brn. 416.00 FERROGRAPH Laby. ±4 Wal.

SOUND SOURCE 82 Ac. Sus. 8 2 Phen. 50-18 94 5 8 10x8x20 Vin. Knit, 15 Ring ±3 Blk. 39 T-82 Pas. Rad. 8,8 2 Phen. 40-20 94 5 8 11'/.x11'/, Vin. Knit, 27 Ring ±3 x30 Blk. 103 Vented 10 5 Cone 2 Phen. 40-20 96 5 8 13%x101/4 Vin. Knit, 25 Ref. Ring ±3 x22% Blk. 123 Vented 12 5 Cone 2 Phen. T 40-20 96 5 8 15x101/2 Vin. Knit, 34 Ref. Ring ±3 x24% Blk. 124 Ac. Sus. 12 5 Cone (2) 2 Phen. M,T 40-20 94 5 8 15x121/2 Vin. Knit, 36 Rings ±3 x24% Blk. H12d Vented 12 4x11 Horn 1 Dome M,T 35-20 98 5 8 15x121/2 Vin. Knit, 36 Ref. ±3 x24% Blk. T-123 Vented 12 5 Cone 2 Phen. M,T 35-20 94 10 8 15x101/2x35 Vin. Knit, 40 Ref. Ring ±3 Blk. 1020 Vented 10 5 Cone 2 Phen. T 40-20 5 8 131/4x10'/. Laq. Knit, 40 Ref. Ring ±3 x22% Wal. Blk. D-12 Vented 12 4x11 Horn 2 Cone M,T 30-20 5 8 15x12' Laq. Knit, 45 Ref. ±3 x241/2 Wal. Blk. 1220 Vented 12 5 Cone 2 Phen. M,T 35-20 5 8 15x101/2 Lag. Knit, 42 (Continued) Ref. Ring ±3 x24' Wal. Blk. 1240 Vented 12 2x6 Pz. 3540 10 2k 8 15x12' Laq. Knit, 42 Ref. Horn ±3 0241/4 Wal. Blk.

The Analog Module® Approach All of Audio Research's products (except the vacuum -tube units) share in common ou, exclusive Analog Module® technology. Simply stated the Analog Module® is r othing more than the practical packaging of our proprietary circuitry to employ the bi -polar transistor (and other discreet components) in a linear fashion for low distortion audio applications. The end results include straight -forward designs, easy maintenance, high performance audio products from these basic building blocks.

The SP -4A High Definition® Stereo Control Preamplifier The SP -4A is our most deluxe control unit. with ample features to satisfy the most involved "audiophile". Frequency Response: -3 dB, 5 Hz and 1C0kHz audio research THD IMD 2V RMS output. 2843 -26th AVE. SO. Distortion: Less than .005% or a MINNEAPOLIS. MINN. 55406 2 dB stepped controls - programmable magnetic inputs

Enter No. 6 on Reader Service Card ,`

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SOUND SOURCE 1A Pas. Rad. 8 Cone 1 Dome 40-22 94 5 2.5k 8 13x13 Laq. Knit, 30 (Continued) ±3 x24 Wal. Blk. 2A Vented 10 5 Cone 1 Dome T 38-22 96 10 1k,6k 8 13/x101/2 Laq. Knit, 30 Ref. ±3 x26 Wal. Blk. 3A Time Line 10 5 Cone 1 Dome M,T 30-22 96 5 900, 6k 8 15x101/2 Laq. Knit, 50 ±3 x34 Wal. Blk. 4A Time Line 12 5 Cone 1 Dome M,T 20-22 94 20 800,6k 8 16x13 Laq. Knit, 95 t3 x42 Wal. Blk.

TUSK The Wedge 10 41/2 Cone 1 Dome No 30-22 80 100 Var. 6/4.5 12x12x30 Opt. Opt. 32 800.00 ±2 Pair

ZENITH MC4000 Tuned Port 12 5 Cone 31/2 Horn M,T 30-20 91.5 5 600, 8/6 17x131/4 Wal. Cloth, 451/4 255.00 2.0k x28 Brn. MC3000 Tuned Port 10 31/2 Horn T 40-20 90 5 2.0k 8/8 15'/x10% Wal. Cloth, 29 309.95 x241/4 Vin. 8m. Pair MC2000 Tuned Port 8 31/2 Horn 50-15 89 5 2.5k 8/6 141/2x91/4 Wal. Cloth, 18 209.95 x221/2 Vin. Brn. Pair MC1000 Tuned Port 61/2 2 Cone 60-15 88 3 2.5k 8/8 131/2 x7% Wal. Cloth, 131/2 159.95 x201/2 Vin. Brn. Pair

Cassettes £3 -Track / Open -Reel / 40 P 0 ,tip c 4, a`Q `0° MANUFACTURER CP Cf" f b ,tiP ,P. 9P, .. í°

ZENITH High General Normal X 2.95 Performance x 2.99 X 3.89 x 5.25 X 3.63 X 4.49

Ferri- General FeCr X 8.50 chrome

Budget General Normal X 1.84 X 1.99 X 2.63

The Simple Approach .m

In Audio, perhaps more so than in any other electronic discipline, the concept of "simpler is better" proves true. The SP -5, although elegant, is such a product. By eliminating all but essential features, a basic stereo control of the highest quality becomes available at a modest cost. The SP -5 High Definition® Stereo Control Preamplifier

Frequency Response: -3 dB, 5 Hz and 100kHz Distortion: Less than .005% THD or IMD Segmented controls, 2 dB steps

audio research 2843 -26th AVE. SO. MINNEAPOLIS, MINN. 55406

Enter No. 6 on Reader Service Card Cull STEREO DIRECTORY llDDllDll RñDI05/TftPE PLfIYtIIS

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CLARION PE -958A 419.95 s 1.5 80 Needs Yes 5AM Yes Yes Yes No Yes Yes Yes I 2.4x7.1x5.5 Amp or FM

PE -751B 389.95 S 1.5 1 80 10 Yes 5AM Yes Yes Yes No Yes Yes Yes I 1.9x7.1x6.3 or FM PE -550A 279.95 S 4 1 1.5 80 Yes No No No Yes No Yes Yes Yes I 1.9x7.1x6.3 PE -662C 275.75 S 4 1 Yes No No No Yee No Yes Yes Yes I PE -666B 252.95 S 4 1 Yes No No No Yes No Yes Yee Yes I PE -684A 287.95 S 10 1 Yes No Yes Yes Yes No Yes Yes Yes U PE -838A 243.95 S 10 1 No No Yes Yes Yes No Yes Yes Yes U PE -828A 149.50 S 4 1 No No No No Yes Yee Yes Yes U PE -703A 223.50 1 S 4 No 5AM No No No Yes No No No I or FM PE -453A 159.50 S 10 1 No No Yes Yes No Yes No No No U

CRAIG 7684 S 336.95 4.6 60 12 5.0 Yes 4 AM Yes Yes Yes No Yes Yes Yes I 2x7Kx6 or FM T686 419.95 S 4.5 60 12 5.0 Yes 5AM Yee Yes Yes No No Yes Yes I 21x73)(51/4 or FM T688 279.95 S 6.5 70 12 5.0 Yes No Yes Yes Yes No Yes Yes Yes I 2x7'4x6 7681 219.95 S 3.2 65 12 5.0 Yes No No No Yes No No Yes Yes I 2x7%x5% T636 359.95 S 5.3 65 4 5.0 Yes 5AM Yes Yes Yes No No Yes Yes I 2% x7'/ex5'/. or FM 7634 279.95 S 2.4 60 4.5 5.0 Yes 4 AM Yes Yee Yee No Yes Yes Yes I 2x71/4x6 or FM 1638 219.95 S 3.5 60 4 5.0 Yes 5AM No No Yes No No Yes Yes I 2x71/4x5Y. or FM

7606 239.95 S 4.6 66 4.5 5.0 Yes No No No Yes No No Yes Yes I 23/4 x7'hx5Ye 1614 169.95 S 4.0 60 4 5.0 Yes No No No Yes No No Yes Yes I 2x71/2x6 S686 359.95 S 4.5 60 12 5.0 Yes 5AM Yes Yes No Yes No No No I 2%x7'hx51/4 or FM

5683 289.95 S 4.6 71 12 5.0 Yes 5AM Yes Yes No Yes No Yes No I 23/4x71/4x51/4 or FM S682 239.95 S 3.6 71 12 5.0 Yes No Yes Yes No Yes No Yes No I 2x71/2x5'/. 41 S636 324.95 S 4.5 30 4 5.0 Yes 5AM Yes No No Yee No No No I 23/4x71/4x51/4 or FM S606 239.95 S 4.6 66 4.5 5.0 Yes No No No No Yes No Yes Yes I 2%x7/x51/4 S608 179.95 S 4.6 35 4.5 5.0 Yes No Yes Yes No Yes No No No I 2x71/4)(5'/. S632 179.95 S 5.0 60 4 5.0 Yes 5AM Yes Yes No Yes No No No I 21/2x7'/.x51/2 or FM S609 119.95 S 7.0 50 4 5.0 Yee No No No No Yes No No No I 2x7'/.x4e/ T639 189.95 S 6.0 60 4 5.0 Yes 5AM No No Yes No No Yes No I 2x6e/a51/2 or FM 7635 359.95 S 5.3 65 4 5.0 Yes 5AM No No Yes No No Yes Yee I 2x71/2x5'4 or FM

GRUNDIG GCV2700 399.00 S 20 Yes Opt. No No Yes No Yes Yes Yes GCM4700 219.00 S 7 Yes No No No Yes No Yes Yes Yes GCM4600 179.00 S 7 Yes No No No Yes No No Yes Yes GEM5000 139.00 S 7 Yes No Yes No No WKC2035US 316.00 S 2.5 7 Yes Yes No No Yes No GCM 8200 279.00 S 4.5 10 Yes Yes No Yes Yes Yes BulRan EQ. GCM 8100 239.00 S 4.5 10 Yes Yes No Yes Yee Yes

Listen Through the Music System

It is very easy, these days, to talk of sophisticated signal processing equipment that purports to do this or that, but the real measure of audio equipment is not what it does, but what it does not do. Simply to amplify, without adding to, or taking from the musical signal is very difficult, and this is always achieved only in measure. Interestingly enough, you cannot learn that measure of performance from the "specifications" because they relate only to static test conditions, and so we invite you to listen to, The SP -6A High Definition® Preamplifier/Stereo Control Some of the specifications: S P -6A Response -3 dB @ .05 Hz and 250kHz (high Z)

Output: 60 V RMS (Hi Z) at less than 1/2% THD at 1 kHz

Maximum Input Magnetic Phono without overload: 1 kHz -500 mV RMS audio research 10kHz - 1.5 V RMS 2843 -26th AVE. SO. MINNEAPOLIS, MINN. 55406

Enter No. 6 on Reader Service Card ltfiDIOS/TIIPt PLIIYUS

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SANYO FT489 189.95 S 2 55 10 4.5 Yes 5 AM No No Yes Yes Yes Yes I 7x6x2 (Continued) or FM FT1490A 199.95 S 2 55 2,12 5 Yes Yee Yee Yes Yes Yes Yes I 7x6x3 FT646 219.95 S 1.5 4 60 5 Yes No No Yes Yes Yes Yes I 7x6x2 FT1490.2 239.95 S 2 60 2.7,14 5 Yes Yes Yes Yes Yes Yes Yes I 7x6x3 FT1495 239.95 S 2 55 2.7,14 5 Yes 5 AM Yes Yes Yes Yes Yes Yes I 7x6x3 or FM FT690 249.95 S 2 55 4 5.0 Yes 5 AM No No Yes No Yes Yes I 7x6x3 or FM FT1670 299.95 S 2 55 2,12 5.0 Yes 5 AM Yes Yes Yes No Yes Yes I 7x6x3 or FM FT2400 329.95 S 1.5 65 Yes 5 AM Yes Yes Yes Yes Yes Yes I 7x6x2 or FM FT1498 349.95 S 1.5 60 2.7,14 5.0 Yes 5 AM Yes Yes Yes Yes I 7x6x3 or FM FT2200 2 329.95 S 60 Yes 5 AM Yes Yes Yes Yes I 61/4x5x2 or FM FT478 99.95 S 3 4 45 10 Yes No No Yes No Yes No I 61/4x4%x11/4 FT479 109.95 S 3.5 50 4.5 10 Yes No No Yes No Yes No I 7x6x2 FT481 119.95 S 3.5 55 4.5 10 Yes No No Yes Yes Yes I 7x6x2 FT642 129.95 S 2 45 4 10 Yes No No Yes Yes Yes No I 61/4x41/4x19. FT644 139.95 S 2 55 4.5 10 Yes Yes Yes Yes I 7x6x2

TZL INTER- Evadln 199.95 S 8 5 Yes 5 AM No No Yes No Yes Yes Yes I 7x2'/ x6'/ NATIONAL CR6000 or FM Evadin 159.95 S 6 5 Yes No No No Yes No Yes Yes Yes I 7x11/4x51/4 CR3010 AIKO ACS S 5 5 Yes No No No Yes No No Yes Yes I 7x13/4x51/2 8000E AIKO ACS S 15 10 No No No No Yes No No Yes No U 61/4x13/4x2 2200 MO ACS 99.95 S 44 5 5 No No No No Yes No Yes Yes Yes U 61/4x11/4x2 4000 SPIIIINS

Zi`

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AUDIOMOBILE SK65NP 129.95 50 6'/: 25 4 8 8 20-3 F 61/4x6./4x Woofer only. ±5 3% SK10 1 79.95 50 10 4 8 8 26-201c F 33/4x31/4,x1 Tweeter only. ±3 SK100 159.95 100 10 32 4 3 8 101 F 101/4 x 41/2 Woofer only. ±5

AVID Ten 225.00 5 6'h,1 20,10 4 20 2 5 11%x7%x1% With cables. RD -5 40.00 5 41/2 12 8 S 41/2 As above. Ten-01us 250.00 100-10 5 4'/, 12 5 S 41/2 As above.

BOSE 1401 328.95 4'h 9.1 40-17 F Price Includes booster/Et) ±1 (see "EO/Amps" section).

CANTON AC -200 300.00 %, 41/2 48-25 2 S 71/2x51/4x43/4 Blamped, with xcver.

CRAIG R771 99.95 50 6x9 20 6 45-17.5 F 97/xx6%x3'/, ±6 R732 99.95 50 51/4 20 6 50-17.5 F 61/4x21/4 ±6 V480 179.95 40 4,11/4 10,3 12624 2 S 101/4x43/4x61/4 26 V180 24.95 8 3x5 3.6 130-16 S 71/4x31/4x5% 26 V303 39.95 25 51/4 14 80-15 F 61/4x61/4x21/4 26 V301 39.95 12 4 8 120-21 F 51/4x41/4x131, ±6 V360 49.95 25 4x10 10 60-20 2 F ±6 V341 36.95 12 4x6 5.6 85-21 F 6%x4%x2% ±6 V350 89.95 25 6x9 20 60-16 3 F 998x67bx3% (Continued) ±6 SPfIIItIIS

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CRAIG V362 69.95 25 6x9 20 60-15 2 F 9'/e46'/ex3'h (Continued) t6 V451 199.95 40 6x9, 20, 10, 8 60-20 4 Separates with under -dash 51/4, 2.8,1.5 ±6 control. 3, 2 V102 24.95 8 51/4 3.6 6 90-16 F 6%411/4 ±6

DIMENSION MK-I 87.00 30 41/2 8 4 44-22 2 S 7'4x5x41/2 MK-I8 99.00 30 4'1 8 4 44-22 2 S 71/2x5x4% MK -II 110.00 30 4'h 8 4 44-22 2 S 71/2x5x41/2 MK-IIB 125.00 30 41/2 8 4 44-22 2 S 7'/x45x41/2 MK -V1 149.00 60 6 20 4 36-22 2 S 101/4471/245'/. MK-VIB 169.00 60 6 20 4 36-22 2 S 10%47%x51/4 MK-VIII 199.00 75 8 20 4 32-22 3 S 14'4x10x6

GRUNDIG HF 2025 75.00 20 4% 4 30-20 F HF 2040 110.00 20 41/4, 2 4 30-20 2 S 9%44K441/2

I.IRPA LABS Bazoom 100.00 994 15 kV 82 3 10k D.C.-10 k 2.0 Yes 821/xxcarx Sprays on hood, roof or trunk; Aphonic rpm 0.003 will not come ofl In car wash; colors opt. Designed for use in late -model BrIckllns, Corvalrs, Edsels, Packards, and Studs- bakers.

MARANTZ SS169 60.00 30 6x9 20 4 40-13 F 6%49%43'/. SS269 70.00 30 6x9 20 4 40-15 2 F 61's49%43% SS469 110.00 30 649 20 8 40.18 4 F 6%49%43% SS569 130.00 30 6x9 20 8 40-20 5 F 6%49%44 45 SS3269 30.00 30 6x9 20 4 40-15 2 F 61449%43% SS3469 110.00 30 649 20 8 40-18 4 F 614491443% SS625 40.00 12 51/4 10 4 or 50-13 F 61/442 8 SS725 70.00 30 51/4 20 4 50-16 2 F 61/442% SS825 90.00 30 51/4 20 8 50-20 3 F 61/442'/e SS140 40.00 10 4 10 8 60-14 F 44114 SS5000 300.00 250 61/2 4 20-20 2 S 7%41147% SS5100 250.00 250 61/2 4 20-20 2 F 71/.4113S41% SS3357 100.00 30 547 20 4 50-20 3 F 5471443 SS3410 80.00 20 4410 20 4 50-20 3 F 41/441042%

PYLE F52C165fP 48.25 30 51/4 16 2 F 5'4x51/442% Pz.iweeter. INDUSTRIES F52C165-FP4 49.15 30 5'/. 16 2 F 51/4x51/442% As above. F69C190-FD 70.85 60 649 20 2 F 6%49%x4 Dome tweeter. F69C290-FD 81.60 100 6x9 30 2 F 6%x9%x4'/. As above. F69C290-FD4 82.50 100 6x9 30 2 F 6x/ex9iS441/4, As above. F4100160 -FP 49.90 30 4x10 18 2 F 41/4410x3 Pz. tweeter. F52C100-FP 41.60 20 51/4 10 2 F 51/4451/4421/2 As above. F69C100-FP 49.90 30 6x9 10 2 F 6itx9'/sx3'/. As above. F69C190-FP 58.25 60 6x9 20 2 F 6%x9%x4 As above. F69C290-FP 66.60 100 6x9 30 2 F 6%49%441/4 As above. F410C100-FP 43.25 30 4410 10 2 F 41/4x1043 As above. F35C30-WF 19.15 16 31/2 3 2 F 314x4jSx1% F5C99-WF 22.50 18 5 10 2 F 5421/2 F52C100-WF 22.90 20 51/4 10 2 F 51/4x51/.x2x/e F6C100.WF 24.90 30 6 10 2 F 61/2x21/. F57C100-WF 24.90 28 547 10 2 F 5471/4421/2 F69C100-W 23.75 30 6x9 10 F 614491443 F69C100-WF 25.40 30 6x9 10 2 F 614491443 F410C100-WF 25.25 30 4,10 10 2 F 41/4410421/. PK52C165-FP 108.25 30 51/4 16 2 F 51/4451/4421/2 Pz. tweeter. PK69C190-FD 149.90 60 6x9 20 2 F 6%x9%44 Dome tweeter. PK69C290-FD 166.60 100 649 30 2 F 6114911x41/4 As above. PK410C160- 109.90 30 4410 16 2 F 41/4x10x3 Pz. tweeter. FP PK52C100-FP 91.60 20 51/4 10 2 F 51/.x51/4421/2 As above. PK690100-FP 108.25 30 6x9 10 2 F 61149?5x31/4 As above. PK69C190-FP 124.90 60 6x9 20 2 F 6%49%x4 As above. PK69C290fP 141.60 100 849 30 2 F 6%49%x41/4 As above. PK410C100- 96.60 30 4410 10 2 F 41/441043 As above. FP

PK52C100-WF 61.60 20 5'/1/4, 10 2 F 51/4451/442% PK69C100-WF 66.60 30 6x9 10 2 F 6%x9%x3 PK410C100- 63.25 30 4x10 10 2 F 41/4410421/. WF P-G52N 10.85 51/4 F 61/2 rd. G69ND 6.25 6x9 F 6%x91/2 G410ND 5.85 4x10 F 51/24101/2 W6C170-F 33.25 70 6 16 8 F 61/2x3'/e W69C190-F 38.25 70 6x9 20 8 F 6%4914431/2 W69C290-F 49.90 100 6x9 30 8 F 611491144 W69C290-F4 50.85 100 6x9 30 4 F 614491444 T3PA 14.90 3 3k -30k F 3%41/4 Pz. tweeter.

AUDIO January 1980 SPthIOEIIS

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SANYO SP780 89.95 30 6x9 20 8 30-2 F Separately mounted 2 -way, 4 -speaker system. 3.5 3 2.2 8 2k -18k F SP795 99.95 35 5 20 4 or 8 100-2 2 S 4%x71/2x41/2 Sell -contained, 2-way system. 35 3 5.0 4 or 8 2k -20k 2 S SP754 79.95 25 5x7, 15 4 or 8 70-20 3 F/S 6x8 SP768 69.95 28 6x9 20 4 or 8 45-16 2 F SP770 79.95 28 6x9 20 4 or 8 60-20 3 F SP777 99.95 30 6x9 20 4 or 8 30-18 3 F SP731 44.95 21 6 10 4 or 8 80-15 2 F SP733 59.95 22 6 10 4 or 8 50-17 2 F SP737 69.95 23.5 6 10 4 or 8 45-20 3 F SP757 54.95 18 5x7 15 4 or 8 8015 2 F/S 8x6x4 SP700 12.98 5 6 3.2 8 100-10 F SP705 16.98 8 6 3.2 8 100-10 F SP708 20.98 8 4 5.4 4 or 8 100-12 F SP710 29.95 12 6 10 4 or 8 90-13 F SP720 39.95 14 4 6.7 4 or 8 10-12 2 F

SOUND UD-1 100 6,1 8 40-20 2 7x111/2x3 SOURCE 23

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ADS P100 300.00 Amp 50 0.08

AUDIOMOBILE SP300 149.95 EC) 3 No 215 0.05 4.5x1.6x4.1 SA400 99.95 Amp 36 0.25 4%x51/2x2 SA2000 399.95 Amp 200 0.20 7%x7%x4'/.

BOSE 1401 See "Speakers" Amp 50 0.09 10x41/2x1'/x Section.

CRAIG V501 59.95 Amp 12 1.0 71/4x2x51/4 V502 84.95 Amp 24 0.5 8' x5'hx2'/x V503 199.95 Both 4 No 212 36 0.1 Two units: 7x11/4x4%, 9x3x5%. V504 119.95 Both 2 No 210 12 2.0 6x21/4x5'4 V505 144.95 Both 4 No 212 24 0.5 Two units: 7x11/4x41/4, 61/2x21/4 x51/2.

GRUNDIG GAA7000 72.00 EO 5 212 0.5 61/2:3'6x11/4 ESO 70 178.00 Amp 35 0.2 . 6:51/2x21/2 ESO 70E0 376.00 Both 3 No 215 35 0.2 Two units: 6x5'/:x21/2, 41/2x31/2x11/2.

MARANTZ SA2040 150.00 Amp 10x4 0.5 2x3%x9x SA2415 250.00 Amp 30x2, 0.05 2x5'/:x10'/. 15x4 SA230 70.00 Both 2 212 10 0.5 1%x4'/.:7'4 SA247 160.00 Both 7 212 15 0.5 21/ex6%x51/4

SANYO PB3000 34.95 Amp 15 1 6x4x2 P85050 59.95 Amp 25 1 61/2x21/4x5 PA7000 99.95 Biamp 5,23 3 Two units: 3x9x7, 11/2x21/2 x41/2. PA6050 119.95 Amp 25 0.05 3x7x7% PA6100 149.95 Amp 50 0.05 3x7x7% PA6060 199.95 Biamp 5,25 0.05 3x41/2x71/4 PA6120 249.95 Biamp 10,50 0.05 3x4'/:x73: EOZ6200 69.95 EO 7 No 212 0.1 616x4%x2 EOZ6400 99.95 EO 7 No 212 0.1 71/2x5x2

TZL INTERNATIONAL Evadin EOB-60 49.95 Amp 30 11/2x4x41/2 Evadin EOB-61 99.95 Both 5 Yes 212 30 1 %x5%%x6'/, Evadin EOB-160 39.95 Amp 30 11/2x4x41/4. Evadin EOB-260 69.95 Both 5 No 212 30 11/2x4x4%

AUDIO January 1980 THE ONKYO TX-MKII RECEIVERS... COMMITTED TO QUALITY

ONKYO IXoI, uXqU 1XION1(IrviH MIIE)E I I X-OSUUM.f

FM 99 hf1CJ 90 92 94 96 3e hfl.'! 104 hI36 ern -3 MHi

4= MOM 000041,

Most manufacturers play "take away" when they design dollar ratios at all power leve s, starting with the top-of -the - a product line. With every cost reduction, there's a quality line digital -readout TX-8500MIQI rated at 160 watts per loss. Onkyo takes a different approach. Eaci of the five channel, with 0.05% total harmonic distortion, both models in the TX-MKII series of receivers represents an channels driven into 8 ohms -rom 20 Hz to 20 kHz, to the exceptional value for price. And vital performance features modest TX-1500MI401 at 17 watts per channel and 0.03% such as Onkyo's exclusive distortion -free, quartz or servo - THD under the some conditions. locked FM tuning are built into each of the receivers, as is Doh't step down in quality. Step up to Onkyo. the sophisticated HTSTM (Human Touch Sensor) control. HTSTM senses your touch on the tuning knob and "unlocks" the Artistry in Sound station. You rough tune to another station, release the knob, and the HTSTM analog comparator circuits cutomatically find and precisely lock into the most distortion -free station Eastern Office: 42-07 20th Avenue, Long Island City, NY 11105 (212) 728-4639 setting. Midwest Office: 935 Sivert Drive, Wood Dale, IL 60191 (312) 595-2970 And aside from West Coast Distribution Center: Darrark Industries, Inc.. the excellent signal-to-noise ratios at all 20600 Nordhoff Street. Chatsworth CA 91311 (213) 998-6501 inputs, the Onkyo TX -MIS series provides excellent value -to- Canada: Sole Distributor. Tri -Tel Associjtes, Ltd., Ontario. Canada

Enter No. 30 on Reader Service Card left in the first balcony, as a control room. Into it were crammed two Neu- mann lathes with SX-68 and SX-74 cutting systems and a Scully lathe with the new Ortofon 732 cutting system. There was an Ampex ATR-102 for straight analog recording, an Ampex ATR-104 for four -channel analog recording, and Dr. Tom Stockham was on hand with his Soundstream digital recording system. With a pair of the big new UREI Time -Aligned® monitoring speakers, we were in business. Maestro Fiedler approached all this new recording technology with his. usual aplomb, and he was quite non -

Bert Whyte with Arthur Fiedler during a playback in the control room.

MICRON 10 chalant about my somewhat unortho- wie4K dox orchestral layout. The players were ee a little concerned about this new-fan-new -fan- gled recording at first, but after the first playbacks they were quite enthusiastic and played like the superb musicians they were. We made a few test cuts so the Maestro could acclimate himself, and were rewarded by hearing $12 him say, "Now, by God, that's how we PAIR sound in Symphony Hall!" As we Enclosure made the first direct discs, we were 50 Dimensions: amazed that the number of "blown" 7"H x4'/2"W x4"D lacquers, from either technical or musical problems was quite minimal. Af- The brand new RSL MICRON 100's offer features that even the most expensive im- ter the first run-through, we were ported mini -speakers can't match. Their price is not the $250-$300 you'd expect,but ready for playbacks. Naturally, we only $125 a pair! Amazing savings are yours by dealing directly with RSL SPEAKER couldn't play back the direct -disc SYSTEMS. RSL manufactures a complete line of speaker systems used extensively in lacquers without ruining them, so Tom recording studios, radio stations and discos. Our philosphy is that a quality speaker Stockham gave us a playback of his di- must have meticulous design, the finest parts, and careful assembly. Duality commands gital tapes. After a minute or two of

a high price, but ours is lower because you deal directly with RSL . listening, the Maestro turned excitedly to me and said, "Listen to that, Bert. Compare these features! No hiss, by God, no hiss. That's mar- ...E.Z. hook-up terminals (no tools required). velous. Marvelous!" Everything went included. ...Highly accurate sound for auto or home use. ...Mounting brackets and hardware smoothly the following day when we ...1" soft -dome tweeter, 4" butyl surround woofer. ...We guarantee that you'll agree there's no finer -of Ev- Both drivers feature large magnet structures for mini -speaker than the RSL MICRON 100 or return recorded the other side the disc. high power -handling and maximum efficiency. Die- them within 2 weeks of receipt for a prompt refund. eryone was just bubbling with enthu- cast metal enclosure. ...2 year limited warranty on both parts and labor siasm about the quality of the play- ...RSL's exclusive tweeter protector makes our (twice as long as some others). Prompt service if backs. At the end of the session we in reliability. needed. speaker superior broke out champagne to toast the occasion, and Arthur said to me, "I'd rather have Schnapps, but what the of Please rush me pair(s) of RSL MICRON 100's at the purchase price hell, champagne is all right!" $125 per pair, plus $4.50 for shipping & handling. Enclosed is my check or We played the digital tapes at the money order for $ Sorry no C.O.D.'s (Calif. residents add 6% AES convention the next day, and they Sales tax). Please charge my: BankAmericard/Visa Mastercharge. caused quite a sensation. Sadly, al- Interbank# Credit Card# Exp Date though negotiations were in progress for a follow-up recording with the Maestro, his death ended all that. Ar- PRINT NAME thur Fiedler was under no illusions ADDRESS CITY that he was a conductor to test his STATE ZIP mettle against a Mahler or Bruckner, but in his particular musical milieu, he PHONE( ) - had no peer. As Tom Morris said to me, "We can ROGERSOUND LABS get another conductor for The Pops, 8381 Canoga Ave.,Canoga Park, Ca. 91304 (213)882-4600 but we can never replace Arthur Fiedler." Amen. A

AUDIO January 1980 Enter No. 34 on Reader Service Card INSIDE EVERY RECEIVER OWNER IS A SPECTRO ACOUSTICS BUYER

Don't blame the singer if her high range adjustment over the entire audible crucial determinant of the quality of notes make your teeth hurt. Or the listening range -octave by octave. The music you hear, and a necessary tool drummer if his boomy performance 210R offers additional features such for getting full value from your threatens to dislodge a kneecap. as a pair of unity gain adjustments and investment in equip ment and records. The rotton sound probably comes a full range of tape equalization and And beyond that, a Spectro Acoustics from your lack of control over your monitoring facilities, equalizer is just plain listening environment not from their for creating tapes that fun to use. lack of talent. are pre- equalized for Plain truth is, good sound, like special listening good sailing, is about 90% balance. environments - like And your listening room simply your car sound system. SPECTRO scuttles the tonal balance of every A Spectro Acoustics ACOUSTICS IIII piece of music that comes through Model 210R or 2102R Built for enjoyment your system. equalizer is, after 4500150th Avenue N.E., Spectra Acoustics M equalizers are loud speakers, the most Redmond, Washington 98502 made to let you hear music as it was All Spectro Acoustics products really meant to be heard. Our Model are manufactured in the U.S.A. 2102R has ten silicon damped slide pots for each channel, for a 30dB

Enter No. 44 on Reader Service Card he most generally agreed upon objective of high fi- in the home listening environment. Our ability to meet this delity is to recreate the realism of live music perfor- challenge is certainly enhanced by analyzing and under- mances in the home listening environment. Various standing the acoustic and psychoacoustic factors that charac- acoustic characteristics and psychoacoustic phenome- terize "live performance" sound, so that appropriate consid- na have been identified over the years that appear to be eration will be given to these characteristics when attempting responsible for the emotional impact and excitement that we to make improvements in the music recording and reproduc- experience at a live performance. However, past limitations tion process. in the tape recording process and software formats for tradi- Characterizing Live Performance tional delivery systems, that is records and tapes, have im- Sound and posed serious restrictions on one of the major factors in- Our appreciation enjoyment of music, whether live or recorded, is strongly related volved dynamic range. This article will explore the signifi- to three major factors that char- - acterize live performance sound: Tonal balance, cance of dynamic range in music and review the use of spatial perspective, and dynamic range. noise -reduction technology and dynamic range expansion to improve the realism of music reproduction for increased lis- Tonal Balance tening pleasure. The tonal balance of music has received the greatest Since the late 1890s when Thomas Edison and Emile Berlin- amount of attention over the years. It has long been appreci- er first began to record musical performances on cylinders ated that the low -frequency content of music should be kept and discs, there has been a persistent disparity between the in balance with the high -frequency content, consistent with quality of "master" recordings produced -with the performing that which occurs in live performance. Today, most recording artist and that of mass-produced copies made from the mas- and reproduction equipment is capable of handling frequen- ters. Steady advances in recording technology, however, have cies that extend well beyond the audible range of 20 Hz to 20 improved every link in the chain of music recording and kHz. Electronics are readily available that offer responses reproduction, narrowing the gap between live and recorded over this frequency range with variations smaller than those performances. which can be detected aurally. Covering a frequency range A major milestone in the history of recorded music was the necessary for quality music reproduction is no longer a signif- introduction of the long-playing microgroove record in the icant technical challenge for records, phono cartridges, and 1940s, which increased the playing time of records so that tape recorders. Also, many fine speakers are now available compositions of considerable length could be recorded unin- that are capable of uniformly reproducing most all frequen- terrupted. Another major advance followed in the form of cies in the audio spectrum. Further improvements in fre- magnetic tape recording that provided a means of editing quency response characteristics are unlikely to produce recorded performances and producing a master tape from greatly significant improvements in the perceived tonal bal- which an unlimited number of vinyl pressings could be ance quality of recorded music. made. Unfortunately, magnetic tape recording of analog sig- Spatial perspective is a somewhat elusive quality of sound 52 nals introduced its own set of problems which detracted involving a complex combination of geometric and temporal from the fidelity of recorded music, the most notable being factors. In the geometric dimension, our perception of the tape hiss, but also including wow and flutter and other forms spatial character of sound seems to center around a pano- of distortion. ramic sound field in which individual instruments can be The realism of recorded music was dramatically enhanced localized. Giving breadth to the musical performance, the 6n the 1950s with the introduction of stereophonic sound, sense of spaciousness involved is extremely important in cre- which brought much of the perspective of the hall or stage to ating the illusion of "being there" at a live performance. Ster- the home. The "three-dimensional" character of sound pro- eo sound reproduction represented a major step forward rel- duced by multi -channel signal processing a touched off great ative to recreating the spatial perspective of live music. Also, deal of research that, in the late 1960s, led to a development special speaker designs have been developed in an attempt that promised an even greater increase in realism of recorded to produce a combination of direct and reflected sound simi- music quadraphonic sound. But, the audio industry expe- - lar to that which exists in live performances. Finally, recent rienced a marketing disaster with quad due, in large part, to developments have resulted in microphones and signal -pro- its inability to agree on hardware and software standards. The cessing techniques which are claimed to recreate the sound potential benefits of four -channel sound were never fully field geometry present during the original performance. realized, even though the concept had considerable techni- The temporal aspect of spatial perspective is primarily re- cal merit and is still being explored. lated to what is usually described as a sense of ambience. Over the years, the quality of music -reproduction hard- What a listener hears at a live performance is a composite of ware (amplifiers, record playing equipment, and speakers) multiple sound waves, each arriving at slightly different times has surpassed that of available music software records, - because of the many different sound transmission paths that tapes, and radio broadcasts. In response to growing demands are involved. This dimension of live music has been the sub- for recordings with improved sound quality, so-called "au- ject of considerable research and experimentation over the diophile" records were introduced the 1970s in the during years involving the use of reverberation and delay -line de- form of direct -to -disc records and digitally mastered records. vices to create auxiliary acoustic signals that are delayed in The major contribution made by these technical innovations time from the master audio signal. The most recent develop- was the elimination of tape hiss and the various forms of ments that address the temporal character of sound in music distortion associated with analog master tape recordings. reproduction are electronic "time delay" or "ambience re- Their over records was superiority conventional immediately covery" systems that employ either analog or digital signal obvious; however, even these fine recordings are too often processing to create auxiliary signals with variable amounts marred by the presence of record surface noise and restric- of time delay. The primary function of such devices is to tions on the dynamic range that could be captured on and simulate the ambience of a wide range of acoustic environ- retrieved from a vinyl disc. ments - from small, intimate rooms to large, highly rever- We are still faced with the challenge that has been the berant halls. underlying motive for the steady stream of technological ad- There is still much to learn about the geometric and tem- vances in sound recording and reproduction - to recreate poral characteristics of sound. Some of the approaches taken the excitement and emotional impact of a live performance to introduce spatial perspective in music reproduction have

AUDIO January 1980

The importame of Dynamle Range

Jerome E. Ruzicka Vice President, dbx, Irnc., Newton, Mass. 02195

4,4A.4,e, A similar problem occurs during disc mastering, since the maximum dynamic range that can be stored on a vinyl disc is about 55 dB for conventional pressings and up to about 65 dB for the very finest pressings. Again, a substantial loss in excitement, emotional impact and realism results from the dynamic range restrictions of conventional discs - and they are plagued as well by annoying record surface noise, even for the best direct -to -disc and digitally mastered records. Since dynamic range has a tremendous effect on our enjoyment of music, it should be recognized for its importance and receive more attention in the music reproduction pro- resulted in an unnatural sound quality. Others have im- cess. Further improvements in characteristics like frequency proved the sense of realism. More substantial advances in response are not likely to significantly increase the overall creating a realistic spatial perspective undoubtedly are yet to quality of music reproduction. On the other hand, a modest come. increase in dynamic range will be immediately perceived as Dynamic Range making substantial improvements in the realism of music reproduction. Consequently, dynamic range represents very Dynamic range is the difference between the sound levels during the loudest (fortissimo) and quietest (pianissimo) mu- fertile ground to be explored relative to coming closer to our goal of recreating the live -performance musical sic passages. Giving depth to the musical performance, its experience in the home. existence during a live performance is as apparent to the listener as its absence in a recording. Exposure to the dynamics of live music has caused us to appreciate the extremely Understanding Dynamic Range large amplitude differential between the whisper of a lone The range of sound pressure that humans are capable of flute and the thunderous finale of a symphonic work. It's not perceiving is extremely large. For example, the sound pres- too unusual to experience a 90 -dB dynamic range in a live sure is about one million times greater at a level that causes performance but, unfortunately, more than one-third of this pain or discomfort (about 120 dB) as it is for the threshold of range (and its associated effect on realism) has traditionally audibility (0 dB). This means that the human auditory pro- been lost before the music signal gets through the recording cess handles approximately twice the dynamic range in dB and reproduction process. (or 1000 times in sound pressure) of a professional studio In order to store the music information on magnetic tape tape recorder. or vinyl discs, it traditionally has been necessary to compress the recorded signal so 54 or otherwise modify the amplitude of Relative Sound Typical Sound that (1) the signal strength during loud passages stays below Sound Pressure Sources or Environments saturation and tracing distortion levels for tape recording and Pressure Level disc mastering, respectively, and (2) the signal strength dur- 130 dB Artillery Fire (Close Proximity) ing quiet passages stays sufficiently above magnetic tape 1,000,000 120 dB Jet Aircraft (Close Proximity) noise levels and record surface noise levels. Basically, the 110 dB Orchestra/Band (Audience) problem has to do with the signal-to-noise ratio (S/N) limita- 100,000 100 dB Train/Propeller Airplane (Interior) tions of tape and disc recording processes. The S/N ratio has 90 dB Bus/Truck (Interior) to be greater than the desired music dynamic range if loud 10,000 80 dB Automobile (Interior) music passages are to be recorded without distortion and 70 dB Average Street Noise quiet passages are to be heard clearly above the background 1,000 60 dB General Business Office noise on the tape or record. Hence, an S/N ratio of 60 dB may 50 dB Private Office be required to provide a clean dynamic range of 50 dB with 100 40 dB Residential Living Room 10 dB safety margin shared between the top and bottom 30 dB Suburban Bedroom ends of the dynamic range. 10 20 dB Recording Studio During tape recording, a common method for restricting 10 dB Sound -proof Room the dynamic range is to "gain ride"; that is, the recording 10 0 dB Total Silence engineer manually adjusts the levels while the recording is being made reducing them during fortissimo passages and - Fig. 1 - Typical sound sources or environments for a increasing them during pianissimo passages. This same result range of sound pressure levels measured in dB as well limiters is frequently accomplished automatically by using as indicated relative to 0 dB. that prevent high-level signals from exceeding a preset level or by using compressors that gradually reduce level when Our hearing mechanism responds to changes in sound in- loud passages occur and increase level during quiet passages. tensity (pressure) in a roughly logarithmic manner, rather Without the aid of a tape noise -reduction system and ex- than in an absolute way. For this reason, and as a matter of cluding allowance for signal peak "headroom," the dynamic convenience, the decibel scale is used to describe Sound range capability of a professional studio tape recorder is typi- Pressure Level (SPL), as follows: cally 60 dB at the 15 ips speed and somewhat higher at 30 ips. SPL = 20 loglo(P/Po) The comparable figures for high -quality audiophile open -reel where the reference pressure Po is defined as the threshold of tape recorders operating at 7.5 ips is 50 dB, and for a good audibility corresponding to 0.0002 N bar, and a p bar (micro - cassette recorder, about 45 dB applies. The psychoacoustic bar) is the pressure of one millionth of an atmosphere. impact of such dynamic range restrictions is to make the mu- Hence, a range of 0 dB to 120 dB covers the entire range of sic sound "flat" or "thin." The sharp edge of percussive at- sound amplitude that is of interest, much like the range of 20 tacks is blurred, the contrast between loud and quiet instru- Hz to 20 kHz that applies to the audible frequency range of ments is muddled, and the overall definition is obscured, sound. thereby diminishing the excitement and realism of the re- Typical sound sources or environments are presented in corded performance. Fig. 1 for a 130 -dB range of sound pressure levels. A doubling AUDIO January 1980 SONIC HOLOGRAPHY

Carver Sonic Holography '= it is absolutely astonishing.

Sonic Holography .M technology provides a Here's what the experts said about Carver dimensionally realistic sonic image from any Sonic Holography: stereo tape, record, or broadcast. Instru- ments and voices appear naturally and "The results were positively breathtaking... . convincingly within a wide and deep sonic With the lights out, we could almost have sworn we stage, behind, in front of, and off to the sides were in the presence of a real -live orchestra." of the two front speakers. This remarkable Harold A. Rodgers achievement until recently has been a Senior Editor, Popular Electronics, May 1979 laboratory curiosity demonstrated with special recordings or in anechoic chambers. "The instrumental sounds, originally heard in Carver research brought Sonic Holography a more or less narrow line between the out of the laboratory and into the listening room. speakers, were suddenly located down the side walls of the room to a point nearly as far back as we were sitting (about 12 feet from the speakers). The sound took on a rich, solid quality ... "

"The `miracle' in Carver's technique is that it uses only the two normal front speakers-and that it works!" Julian Hirsch Hirsch -Houck Laboratories Stereo Review May 1979

"My listening experiences leave no doubt that the technique produces a far more plausible x sonic illusion of space and localization than is X produced by normal stereo.... it brings the listener substantially closer to that elusive sonic illusion of being in the presence of a live performance." Top view of room with listener facing speakers Larry Klein, Technical Director Stereo Review, May 1979

The holographic image places instruments in a broad "In sum, listening to the C-4000 in its proscenium arc. Primary sound images (x) clearly hologram position was a thrilling sound emerge from beyond the room boundaries each in a experience for me. Plain old stereo will never fixed and totally natural position. There is no spatial distortion in size or location of the instruments. Such be the same." holographic imaging is not possible with conventional Arthur Salsberg, Editorial Director stereophonic or time -delay enhanced reproduction. Popular Electronics, May 1979

Sonic Holography is now available in the Carver C-4000. It is a versatile control console that also includes a sophisticated preamplifier, third generation Autocorrelator for noise reduction, Peak Unlimiter for restoration of dynamic range & Time Delay with built-in power amplification. For copies of the complete reports write to the Carver Corporation or use the reader service card. CAR\7 ER COR PORATION P.O. Box 664 Woodinville, Washington 98072 Enter No. 12 on Reader Service Card of sound pressure corresponds to a 6 -dB increase in SPL, cording a master tape and those that are associated with disc while 20 dB represents an order of magnitude increase. While mastering and playback. Direct -to -disc, digital recording, and the levels of SPL are approximate for each sound source indi- tape noise reduction applied to conventional analog record- cated, a comparison of relative SPLs is very revealing. For ing are techniques that address the issue of eliminating (or at example, the background noise level in a residential living least reducing) the introduction of noise prior to disc master- room is 10 times (or 20 dB) higher than the level in a recording. Unfortunately, full benefit of these advanced recording ing studio. Similarly, the noise level that exists in a general techniques is lost to a great extent when the recording is business -office environment is 10 times higher than the living transferred to a vinyl disc. room level. With the masking effect of tape hiss removed, the surface Returning to music, it is possible for peak sound pressure noise of the record becomes all the more objectionable. It levels to momentarily reach 120 dB during transients. If these appears that the elimination of a major noise source, such as peak levels are produced in a studio, concert hall, or home tape hiss, serves to highlight another - record surface noise environment, the "noise floor" of 20 dB to 40 dB, depending generated as a result of the interaction between the stylus on its spectral distribution, can reduce the perceived dynam- and the record groove. Any roughness of the vinyl surfaces of ic range of music to about 90 dB. Therefore, a music record- the groove walls causes extraneous stylus motion, creating ing and reproduction system need only be required to han- the familiar record surface noise which is inseparable from dle a maximum dynamic range of 90 dB to properly represent the music on conventional vinyl discs. Of course, the oppo- the characteristic of live performance sound. site is also true. If the surface noise of discs is eliminated, any imperfections in the master tape relative to hiss or other Noise Sources and Masking Effects forms of noise and distortion become more apparent. Hence, It is important to note that there are two separate and it is clear that noise in both the master tape and the recorded distinct fundamental sources of noise which detract from the disc has to be eliminated, or at least dramatically reduced, to fidelity of recordings - those that are introduced while re - significantly improve the quality of recorded music. Evolution of Recording Technology MANUFACTURING A RECORD Since the mid -1940s, there have been major technological Master vinyl lacquer advances in sound recording. Prior to the development of (positive image)...... , magnetic tape recording, records were made in the old 78 IMO rpm format involving the cutting of a single -channel Silver coating (monaural) groove in the surface of a master recording blank. sprayed on lacquer The fidelity and time per side (four minutes per side on a 12 - to make it electrolytic to accept plating in. disc) were limited, and any performance errors required (positive image). recutting the master. With the advent of the long-playing 56 Silvered lacquer is then plated with a microgroove record came extended playing time per side, coating of nickel. Nickel and silver improved pressing quality (accomplished by using vinyl in- metal master is pulled stead of shellac), and increased durability all in a from the master (neg- - resulting Nickel metal master is plated with addition- ative image). better overall value to the record -buying public. al coating of nickel creating the -mother. Mother is plated with nickel The Record Manufacturing Process Mother is pulled from creating the "stamper". The beginning point in the record manufacturing process the nickel metal\ master. The mother is the production of a master disc or lacquer. This is accom- may be played (posi- plished by using a master tape recording (or the real-time tive image). output of a mixing console in a direct -to -disc recording session) to provide an electrical signal is fed a Stamper is formed to V Stamper is pulled that to heated fit into the record press 1 from the mother cutting stylus which engraves the surface of the lacquer with There is a stamper (negative image). traces representing the musical waveform. The diagram pre- for side 1 and a stamper. for side 2 of each record. - sented in Fig. 2 illustrates each subsequent step of the pro- U cess involved. Since the quality of a lacquer may deteriorate PVC pucks are in- if it is not plated shortly after being cut, the multi -stage elec- serted between the are applied Heat and steam troplating process is generally scheduled to occur immediate- two stampers. as tremendous pressure squeezes the stampers to- ly after the master cutting session. The (positive image) gether, forming the record. lacquer is plated to produce a (negative image) metal master. Then a (positive image) metal "mother" is made, from which (negative image) metal stampers are made. The stampers are used to press (positive image) vinyl discs that are a replica of the original lacquer. From each master lacquer, one metal master can gen- The finished discs are only trimmed and set aside to erally be made. The number of mothers available from each cure and cool. metal master is limited, as are the number of stampers from each mother and the number of pressings from each stamper. These limitations are such that only about 20,000 to 25,000 high -quality pressings can be produced from each lacquer. Discs are inserted into their Multiple lacquers, therefore, are necessary to produce larger sleeves and covers, and are quantities of quality pressings. then shrink-wrapped. Analog Tape Recording Fig. 2 - Illustration of the various stages of the For the last several decades, it has been common practice record manufacturing process. (Courtesy of Nautilus in producing records to temporarily store the musical per- Recordings.) formance on magnetic tape. A typical recording session in -

AUDIO January 1980 ®1979 TDK Corp. The standard Electronics bearers.

The high bias standard. In the past few years, these fine deck Which makes SA the logical choice manufacturers have helped to push for home use; the best way to be sure the cassette medium ever closer to you get all the sound you've paid for. But sound isn't the only reason the ultimate boundaries of high SJpe> PreclsKA .a35eite Alecean:srn fidelity. Zbday, their best decks SA is the high bias standard. Its can produce results that are super -precision mechanism is the virtually indistinguishable most advanced and reliable TDK has from those of the best reel-to- ever made-and we've been backing reel machines. our cassettes with a full lifetime Through all of their tech- warranty* longer than anyone else nical breakthroughs,they've in hi fi-more than 10 years. had one thing in common. And to make sure that So if you would like to raise your They all use TDK SA as kind of performance own recording standards, simply switch their reference tape for the is duplicated by each to the tape that's become a recording high bias position. These and every deck that legend-TDK SA. TDK Electronics manufacturers wanted a comes off the assembly Corp., Garden City, NY 11530. tape that could extract line, these manufac- every last drop of per- turers use SA to align formance from their decks their decks before they and they chose SA. leave the factory. 44TDK. The machine for your machine. In the unlikely event that any IDS cassette eyes tails to perform due to a detect in materials bra tree replacement Enter No. 47 on Reader Service Card or warknansmp simply retarsi it to your local deareror to UDC volves the recording of multiple "takes" of a musical selec- amount of noise added during the recording process. Hence, tion in order to provide enough material to create something they might appropriately be called noise -prevention systems. which approaches "the perfect performance." This is accom- Both Dolby and dbx operate effectively as companders - plished by an editing engineer who listens to the various a signal processing system involving encoding of the audio takes and chooses the best parts of each one, then combines signal during recording and decoding the signal during play- them together (by physically cutting and splicing the mag- back. However, their operation is based on completely differ- netic tape). This results in an edited recording of the musical ent principles. selection. The practice is so common that few musical selec- The Dolby Type A ("professional") noise -reduction system tions (notably those recorded "live" before an audience) lis- is actually a dynamic equalization system that operates over tened to on a record today represent a continuous perform- four separate bands of the audible frequency range. During ance by the musicians or performing artist. Rather, we gener- recording, increasing amounts of pre -emphasis are applied to ally hear a composite of several performances where any mis- the audio signal in these frequency bands as the signal level take or imperfection is removed in the editing process. approaches predetermined reference levels. During playback, Consequently, the ability to edit represents one of the major complementary amounts of de -emphasis are applied to the advantages of using a magnetic tape recorder in producing a signal in the four frequency bands. Recognizing that the be- record. havior of the Dolby system is nonlinear relative to amplitude, Another advantage of tape recording is that the master the identical reference or "threshold" levels must be em- (edited) tape can be used to cut as many lacquers as are ployed during recording (encoding) and playback (decod- required to meet consumer demand for the record album. ing) to avoid mistracking distortion. The Dolby Type B ("con- Hence, there is no limitation to the quantity of records that sumer") noise -reduction system operates over a single fre- can be produced from a master tape. quency band in the high -frequency region above 1 kHz Although records produced from analog master tapes rep- where tape hiss is normally encountered. During recording, resent the best sound recordings available until recently, all signals having high -frequency amplitudes below a refer- there have been serious technical limitations inherent in the ence level are subject to pre -emphasis, with subsequent process. Various forms of distortion and noise are introduced complementary de -emphasis applied during playback. In the into the recording because of the mechanisms that are opera- course of attenuating the high -frequency content of the au- tive in the recording process. For example, analog tape re- dio signal during playback, tape hiss is reduced. as cording suffers from such problems tape hiss, wow and The dbx Type I ("professional") and dbx Type II ("consum- flutter, frequency response non -uniformity, modulation er") noise -reduction systems operate on all frequencies and noise, multi -channel crosstalk, print -through, and transient all amplitudes of the audio signal. The dbx system functions distortion. Of particular significance is the background noise as a linear decibel compressor/expander that is neither fre- that appears as tape hiss in the recording, which ultimately quency selective nor level sensitive, and thus it does not in- gets transferred to the master disc and vinyl pressings pro- volve the use 58 of reference levels or calibration test tones. duced from the tape. During recording, the amplitude of the audio signal is com- As passes the magnetic tape by the recorder head of a tape pressed while, during playback, the amplitude of the signal is transport during the recording mode, the electrical signal expanded in a complementary fashion. The basic idea behind provided by the microphone pickup of the music perform- the dbx tape noise -reduction system is to keep the music ance causes a reorientation of the magnetic particles on the signal level sufficiently higher than the offending noise level tape to produce a magnetic replica of the music waveform. In (e.g., tape hiss) during recording (encoding) so that, in the the playback mode during the cutting of a master disc, the course of expanding the signal during playback (decoding), magnetic tape passes by the recorder head but, in addition to tape hiss is reduced, thus extending the S/N ratio of the tape "reading" the music signal, the head also "reads" the random recording system. distribution of magnetic particles on the tape and this is By processing all the frequencies in the audio signal, the perceived as tape hiss. Consequently, during the cutting of a dbx system eliminates any anomalies that may be introduced master disc, both music and tape hiss signals are communi- by limiting the companding action to a limited frequency cated to the cutting stylus, thereby introducing background band. Precision level -sensing circuits are used to control both noise in the master disc and all records that are subsequently the encode (compression) and decode (expansion) modes of pressed. As discussed earlier, the presence of noise in analog operation during recording and playback, respectively. Em- tape recording results in dynamic range being restricted to ploying a voltage -controlled amplifier (VCA) and a level de- about 60 dB for professional studio tape recorders, while for tector in each stereo channel, the compression/expansion audiophile reel-to-reel and cassette tape recorders, the dy- gain instructions given to the encode and decode VCAs are namic range is restricted to about 50 dB and 45 dB, respec- equal and opposite (mirror image) as long as the two level tively. A trade-off exists, consequently, between the advan- detectors track accurately. tages of tape recording (editing and unlimited production All recording systems have some frequency -dependent capabilities) and the undesirable restriction it imposes on dy- phase shift which can change waveforms considerably even namic range. though the sound is not audibly degraded. This could introduce an error signal that is added to the music signal prior to Tape Noise -Reduction Systems decoding. The dbx system circumvents this problem by em- A number of techniques have been employed since the ploying wide -range rms (root -mean -square) level -sensing cir- early 1970s to improve the dynamic range capability of ana- cuits that respond to the signal energies, regardless of their log tape recorders. These "noise -reduction systems" process phase relationships, in creating a command signal to drive audio signals in various ways to increase the S/N ratio of a the VCAs. Using a 2:1 compression during recording and a 1:2 tape recording system, resulting in an increase of its usable expansion during playback, this linear decibel compander dynamic range. provides accurate results, even with extremely sharp music Two of the most successful approaches to tape noise re- transients, over a wide (100 dB) range of signal level. duction have been those developed by Dolby Laboratories The decode process in tape noise -reduction systems and dbx, Inc. Neither one can improve the quality of an exist- should be a mirror image of the encode process, and the ing audio signal, that is, any noise existing in the audio signal accuracy of the system in providing precise mirror imaging is processed unaltered. Their function is solely to reduce the determines the fidelity of the signal processing. Any extrane- AUDIO January 1980 s. The spea er on e e 1a The efficiency expert. More improvement the best selling, most popular Like all of the new Jensen The Series I Triax fea- speaker ever. The Series I speakers, the Triax is tures an improved, 20 -ounce car stereo for Jensen Triaxial 3-way speaker more efficient than ever, thanks ceramic magnet structure system. to our special high compliance deep, well-defined bass. Also The speaker on the right cones with Flexair® rim suspen- a new, rugged gasket for a tight is one that's replacing it. sion, 4 Ohm impedance and acoustic seal. Black zinc the cor- The new Jensen Series I Tnae new, more efficient motor chromate plating insures one with even higher effi- structures. Which translates to rosion resistance. The it to be ciency. More power. More guts. very high efficiency that lets We also designed easier to install than the old Sure, they look alike. power. 66% greater Triaxial with the stud - But the similarity ends Fspa;U,m handling capability there. mounted grille. Higher power Some things don't change. handling. There are some Believe it. The things we just couldn't new 6" x 9" Series I improve. Like the idea Triax is rated at 50 of an individual woofer, watts continuous tweeter and midrange average power, com- balanced for accurate pared to 30 watts for the Piezoelectric solid Oven -cared one inch sound reproduction.. old Triaxial. Which state tweeter voice coil. We also haven't means it'll take more power-more heat-and changed our commitment 20 -ounce one-piece to quality. And to back it up, more abuse from high power ceramic magnet our full sac- we steadfastly support car stereo units, without I speak- Series I speakers play line of Jensen Series rificing musical accuracy at the Jensen one year levels. louder with less power for ers with an excellent expense of high volume limited warranty. Why can it take more smoother, distortion -free music in your car. "But they still look power? Because of its new, the same..." larger oven-cured one inch voice It offers 66% greater You say you still can't see coil. any difference between the old power handling for superior JENSEN the new durability. And because the The thrill of being there. Triaxial on the left and solid state Series I Triaxial on the right. special piezoelectric 4136 N. United Parkway you sure will is virtually indestruc- Schiller Park, Illinois 60176 Maybe not. But tweeter be able to hear the difference. tible, yet sensitive to every "Triaxial" and "Trias" are the registered trademarks identifying the patented 3 -way speaker systems of And after all, that's the guts of musical nuance. Jensen Sound Laboratories. (U.S. Patent No. 4,122,315) the matter.

Enter No. 22 on Reader Service Card -60-

-80-

-100 -

-120-

-140 -

250 2.3 K 2.5 K 2.5 K FREQUENCY lHsl FREQUENCY (Hsl FREQUENCY Ms) Fig. 3 - Constant 125 -Hz bandwidth frequency Noise level is shown relative to 0 VU for no noise spectrum of Ampex 456 tape using a Studer/Levinson reduction (upper trace) and for dbx Type II noise A-80 professional studio recorder operating at 15 ips. reduction (lower trace). The total wide -band (20 Hz Noise level is shown relative to 0 VU for no noise to 20 kHz) noise level of -59 dB is reduced to -96 dB reduction (upper trace), Dolby Type A noise by the dbx noise -reduction system. reduction (middle trace), and dbx Type I noise reduction (lower trace). The total wide -band (20 Hz Fig. 5 - Constant 125 -Hz bandwidth frequency to 20 kHz) noise level of -65 dB is reduced to -76 dB spectrum of Maxell UD XL -I tape using a Tandberg by the Dolby noise -reduction system and to less than TCD-340A cassette recorder operating at 17/8 ips. -100 dB (at the limit of the measurement Noise level is shown relative to 0 VU for no noise instrumentation) by the dbx noise -reduction system. reduction (upper trace), Dolby Type B noise reduction (middle trace), and dbx Type II noise reduction (lower trace). The total wide -band (20 Hz Fig. 4 - Constant 125 -Hz bandwidth frequency noise level -48 dB is reduced to -56 dB spectrum of Scotch 206 tape using a Pioneer RT -707 to 20 kHz) of noise audiophile open -reel recorder operating at 7.5 ips. and -84 dB by the Dolby and dbx reduction systems, respectively.

ous signal introduced into the system subsequent to encod- A summary of the total wide -band noise levels for profes- ing but prior is 60 to decoding decoded along with the original sional studio, audiophile open reel, and cassette tape recor- audio signal. This, as well as any mistracking errors between ders, with and without tape noise reduction, is presented in the encode and decode modes of operation, can introduce Fig. 6. The chart also indicates the approximate increase in distortion or artifacts in the form of unnatural sounds. The dynamic range provided by Dolby and dbx tape noise -reduc- nature of the artifact is different for each type of companding tion systems for each type of tape recorder. The information system, but its character is frequently described as a "pump- on this chart may be combined with that previously given to ing" sound or "noise modulation," Obviously, one would tabulate the approximate usable dynamic range capabilities like the companding system to be totally free of any forms of of various types of tape recorders, with and without noise distortion, but reality is such that a trade-off is frequently reduction, as presented in Fig. 7. Usable dynamic ranges in involved between the elimination of tape noise and distor- excess of 80 dB are possible for each type of tape recorder tion of the companded signal. Fortunately, psychoacoustic using dbx noise reduction. Professional studio recorders masking provided by the music signal itself is generally ade- equipped with dbx noise reduction meet the objective of 90 - quate to make the artifact inaudible. The masking effect of a dB dynamic range and, therefore, they can properly represent given sound is greatest upon offending sounds that are of the music dynamics of live performance sound. somewhat higher frequency. Hence, a music signal having It is interesting to note that, with its wide -band compand- frequency content that encompasses the frequency range of ing action, the dbx noise -reduction system makes the dy- the artifact will generally be processed with complete fideli- namic range capability of open -reel tape recorders approxi- ty. The enhanced music experience that is provided by in- mately equal to that of 14 -bit and 16 -bit digital recording creased dynamic range and reduced background noise makes systems (discussed later). This is a particularly important ob- the trade-off heavily in favor of using these types of tape servation in view of the cost penalty associated with digital noise -reduction systems. recording equipment. To illustrate the effect of tape noise reduction on the performance of a range of tape recording systems, background Direct -to -Disc Recording noise spectra were measured with and without Dolby and During the 1970s, a "new" recording approach was intro- dbx noise -reduction systems in the circuit. The results are duced for disc mastering. It involved cutting a master disc in presented in Figs. 3 to 5 for a professional studio, audiophile real time - the same way that 78 -rpm discs were produced open -reel, and high -quality cassette recorder, respectively. from about 1898 until their demise in the early 1950s. Instead The frequency spectrum of noise was measured using an au- of storing the musical performance on magnetic tape, the tomatic spectrum analyzer for a constant 125 -Hz bandwith. electrical signal from the mixing console is amplified and fed The noise spectra in the figures indicate the noise level rela- directly to the cutting stylus of a mastering lathe - hence, a tive to 0 VU for frequencies ranging between 250 Hz and 25 "direct -to -disc" recording. kHz. The total wide -band noise was also measured in each In the many years since 78 -rpm discs were cut direct to case for all frequencies in the audible frequency range (20 Hz disc, advances in the design of disc -cutting equipment have to 20 kHz). Since Dolby noise -reduction systems comparable allowed a return to the direct -cutting method to produce to dbx Type lI systems are not readily available, only noise recordings that sonically are superior to conventional records spectra with and without dbx Type II noise reduction are produced from master analog tapes. The performance advan- shown in Fig. 4 (as well as later in Figs. 6 and 7). tages of direct -to -disc records result from the elimination of AUDIO January 1980 TEAC TEAC TODAY THE X-SEPIES.

You're The brain looking at four behind the trans- new machines port is our LSI that have more in control chip. It common with eliminates the data recorders need for me- than audio re- chanical relays corders. Together so transport they are called control is faster, the X -Series. And more positive they bring a total- and reliable. The ly new kind of LSI also lets us pro- technology to the vide full motion - open reel format. sensing in the Each X-10 and X-10R. X -Series transport Within is an instrumenta- the X -Series, tion mechanism. machines have For 15 years, this been specifically TEAC design has designed for bi- stood the gruel- directional ing test of time in record and play- computer instal- back. Perfectly lations where symmetrical head dependability is stacks (6 heads worth millions. in all) assure top The basic performance in configuration is closed -loop dual both directions. There's capstan. It's extraordinarily quiet, stable automatic reverse and repeat. and precise. Wow & flutter is very low And two-way cue monitoring. Speed accuracy very high. New audio electronics Three DC motors drive the tape. They're accompany this new transport tech- used to keep changes in motor temperature to a nology. Record and playback amplifiers minimum under different loads so constant torque are quieter and completely free of audible distortion. is maintained. The sound is cleaner, more faithful to the source. The Our Magneflout flywheel assembly, a com- fidelity is unsurpassed. pletely new concept, uses magnetics rather than An option previously available only on our mechanics to eliminate problem -causing springs and professional recorders can now be added to any pressure plates. Axial variations between the tape X -Sertes machine. Called dbx I' this noise elimi- and capstans are prevented so proper tracking is nation system adds 30dB to the already high S/N assured. The result is highly accurate audio repro- and over 10dB of headroom to give you master- duction even after years of hard use. quality recordings. The X -Series transport maintains ideal tape-to - If your audio perception is critical, your head contact. Audible drop -outs, level and frequency listening standards high, audition an X-Sertes losses are absolutely minimized. Frequency response is recorder. The performance is flawless. The sound wide and flat. And signal articulation is unusually clear. peerless. TEAC.

'MAC

dbx is a trademark of dbx. Inc.

(1966) Ltd. ©1979 TEAC Corporation of America, 7733 Telegraph Road, Montebello, CA 90640. In Canada, TEAC is distributed by White Electronic Development Corporation problems associated with magnetic tape recording, such as is the sequence of binary numbers recorded on the tape. As tape hiss, channel crosstalk, distortion due to magnetic oxide the magnetic tape passes by the recorder head, the head saturation, print -through, wow and flutter, etc. Records pro- ignores the random distribution of magnetic particles on the duced in this fashion have greatly increased clarity of com- tape which, for an analog recording, is perceived as tape hiss. plex musical passages, particularly those that involve loud Only information about the pure music signal is passed on to bursts of percussion. the master disc, and noise comparable to tape hiss on analog While their sonic superiority over conventionally produced recording is non-existent. Furthermore, digital recording is records is immediately apparent, direct -to -disc records must not plagued by other forms of distortion inherent in the ana- still contend with the dynamic range limitations and surface log recording process, such as wow and flutter, crosstalk, or noise problems of vinyl discs. Furthermore, direct -to -disc re- print through, although it is susceptible to a type of distor- cords have other potential disadvantages, including (1) in- tion known as quantization noise. ability to edit, since the master disc is cut in real time during the musical (2) performance; decreased playing time per side Recorder Type since the cutting lathe must be controlled manually, rather than by a computer as is normally done, and (3) limited Noise Professional Audiophile quantity of records that can be produced (since there is no Reduction Studio Open Reel Cassette master tape to cut additional master discs as required), which None 60dB 50 dB 45 dB results in a premium price. The trade-offs involved re- with Dolby 71 dB N/A 53 dB cords produced in this fashion may not be worth it for those dbx 95 dB 87 dB 81 dB who are bothered by the dynamic range limitations of vinyl discs and the annoying record surface noise that may be still Fig. 7 - Approximate usable dynamic range present. capabilities of professional studio, audiophile open - reel, and high -quality cassette tape recorders, with Digital Recording and without Dolby or dbx tape noise -reduction Digital recording involves the storage and retrieval of a systems. musical performance on magnetic tape with the continuous analog audio signal replaced by a series of binary numbers. A 16 -bit digital system is capable of recording music with a Basically, when music is recorded digitally, its waveform is 90 -dB dynamic range over the complete audio frequency sampled electronically many times a second (such as 50,000 range when a sampling rate of about 50,000 samples per sec- times/sec) to produce a sequence of numbers that, as a func- ond is used. Similarly, an 85 -dB dynamic range is available tion of time, represents a piece -wise replica of the original from a 14 -bit digital system. Editing is accomplished electron- analog music waveform. This sequence of binary numbers ically rather than by physically cutting and splicing the tape. (which are comprised solely of a combination of "zeros" and Digital tapes are immune to degradation caused by long- "ones" - the language of the digital computer) are generat- term storage of magnetic tape, and they can be duplicated 62 ed by an analog -to-digital converter at the input to the tape through many generations without loss of sound quality. The recorder. only drawback to digital recording at its present state of de- When tape is the played back (for the purpose of cutting a velopment appears to be the relatively high equipment cost master disc, for example), the binary numbers are "read" by involved and potential problems caused by lack of standard- the recorder head, and the sequence is translated into an ization. Nevertheless, from a purely technical point of view, analog electrical signal by a use of digital -to -analog convert- the performance capabilities of digital recording are extreme- er. One of the most significant aspects of digital recording is ly impressive and suggest the degree of sound quality that that the only information the playback system can recognize ultimately may be made available to the listening public when technical standards of delivery systems are agreed Fig. 6 Comparison of total wide -band noise levels - upon and digital playback systems of reasonable cost are de- of tape recording systems relative to 0 VU, with and veloped. without Dolby and dbx noise reduction, for professional studio, audiophile open -reel, and Dynamic Range Expanders cassette tape recorders. The approximate dynamic Putting aside for the moment the concept of producing range increase provided by Dolby and dbx tape recordings with full dynamic range and inaudible back- noise-reduction systems is indicated for each type of ground noise, it is appropriate to explore the possibility of tape recorder. enhancing the value of existing record and tape collections by restoring at least a portion of the dynamic range that exist- 40 ed in the original live performance. Since recordings played Cassette Recorder in the home, or those played in broadcast studios and No N.R. transmitted to the home, have their dynamic range limited to -50- e Audiophile 8 dB something generally less than 60 dB (representing a loss of at Open Reel Recorder Dolby B least one-third of the potential 90 -dB dynamic range), Professional No N.R. it -60- Studio Recorder seems logical to introduce some form of dynamic range ex- No N.R. pansion to counteract the compression that exists in tapes, 36dB records, and broadcasts. The general function of such de- -70- II dB vices, known as dynamic range expanders, is to make loud DolbyA passages louder and/or make quiet passages quieter, result- 37dB ing in a spreading out or expansion of -80- the dynamic range of 35dB dbxll the music signal. Unlike the situation which exists with companders, where -90- the expansion process is a mirror image of the compression dbxll process, dynamic range expanders operate in a "single -ended" fashion, processing the music signal according to its dbxI_I par- -loo- ticular design or user concept, rather than providing expansion that is the exact converse of the compression process. -ll0 AUDIO January 1980 In recent years over 500,000 music lovers chose a Realistic® receiver over Kenwood®, Pioneer® and Technics®

:. II3 4 . .' r6 I ilia #1 ' d 3,5 r j- _ i_3 138, 1 - 4N1 Ile lisl tsi 3_3 ._M.1e\Z3t 14;

Why?

We make it easy for you. Radio Shack is a retailer equipment as innovative and complex as a as well as a manufacturer. When the store is also computer is a logical one to choose to build your the factory, you're apt to get less fiction and more stereo receiver! fact. Also, Radio Shack has more company -owned reason to and operated service stations than almost anyone We're close to you. Need another good Instead of tens we know of in the audio business (54 to be buy Realistic? Let's take availability. specific). or hundreds of places to find it, we offer over 7,300 -wherever you go in the USA or Canada-and a We've stood the test of time. Could it be we sell so surprising number of overseas locations as well. much Realistic because we've been around since Being more available doesn't necessarily make us 1921- long before those other brands were even a more lovable. But it goes a long way towards twinkle in daddy's eye? Although hi-fi is typically a assuring you of being able to get in touch with us younger person's product, maybe the kids prefer to when you need advice on adding a tape deck or bet their hard-earned bucks on the outfit with the replacing a lost instruction manual. grayest hair. We've challenged the rest and won your trust. We have the edge on technology. Then there's this Incidentally, we're not picking on Kenwood, Pioneer to consider: The same company that puts Realistic and Technics. The same half -million -plus folks who out front also builds and markets the world's most chose Realistic also probably had a crack at buying popular personal computer, the TRS-805 It seems Sansui,® Marantz® and Fisher.® The important thing to us that a company smart enough to design is ... they didn't!

A DIVISION OF TANDY CORPORATION Radie (hack FORT WORTH, TEXAS 76102 The Nationwide Supermarket of Sound® Since the amount and nature of the compression that existed an electrical signal representing the musical waveform. The during recording and/or broadcast is not generally known, stylus tip is less than one -thousandth of an inch in diameter, dynamic range expanders typically offer a variable range of yet it must travel up, down, and sideways thousands of times expansion capability. The user selects the degree of expan- a second to follow the undulations of the groove. Any rough- sion that provides an overall pleasing effect, avoiding exces- ness of the vinyl surfaces of the groove walls cause extrane- sive expansion that can introduce undesirable artifacts. ous stylus motion, creating the familiar record surface noise Dynamic range expanders based on somewhat different which is inseparable from the music on a conventional disc. operating concepts are available from companies like dbx One solution to the problem of restricted dynamic range and MXR. Most of these devices process the wide -band au- and surface noise of vinyl discs is available through the appli- signal by dio sensing the overall average level of the music cation of dbx noise -reduction technology. The dbx Type 11 signal and increasing the level (making the music louder) noise -reduction system, previously described relative to tape when a preset threshold level has been exceeded. More so- noise reduction, can be employed in record mastering and phisticated expander designs separate the music signal into playback to render record surface noise virtually inaudible, multiple frequency bands so that the degree of expansion while dramatically increasing the dynamic range of the repro- that occurs in a given frequency range depends on the level duced music signal. The operation of this noise -reduction of signal in that range, thus preserving the integrity of tonal process applied to discs is illustrated in Fig. 8 where, for pur- balance and the timbre of individual instruments during poses of convenience, a master tape signal having a 100 -dB complex musical passages. dynamic range is assumed to exist. The. amount of expansion that is appropriate will vary ac- The dbx linear decibel compression/expansion (compand- cording to degree of compression that resides in the audio ing) system operates as follows. The music signal from the signal as well as on individual music tastes. Excessive expan- master tape (or directly from a studio console) is encoded sion can lead to artifacts frequently described as "pumping" (compressed) during the cutting of the master disc and de- or "breathing" noises. To avoid this situation, expansion coded (expanded) during playback. The dynamic range of should be limited to less than a factor of 1.5 for most popular the music signal is linearly (in dB) compressed by a 2:1 factor or rock music, while factors of 1.3 or less are generally pre- when cutting the master disc, which means a music signal ferred for classical music. Properly utilized, dynamic range having a 90 -dB dynamic range is reduced to 45 dB. This fits expanders can restore a significant portion of the original comfortably within the maximum dynamic range storage ca- dynamic range that is lost in the recording process, dramati- pability of vinyl discs. During playback through a decoder, cally increasing the excitement, realism, and enjoyment of the signal picked up by the phono cartridge is linearly ex- conventional recordings and broadcasts. panded by a 1:2 factor so that the dynamic range of the original music signal is completely restored. And, as a result dbx Encoded Discs of downward expansion during decoding, the surface noise The two major problems with vinyl discs that have stayed on dbx Encoded Discs is approximately 30 dB lower than on 64 with us over the years are restricted dynamic range and conventionally -recorded discs. record surface noise. In cutting a master disc, a signal level The frequency spectrum of record surface noise for a con- that is too "hot" can create a condition that will cause tracing ventional disc and a dbx Encoded Disc is shown in Fig. 9 for a distortion by the cutting and/or playback stylus. If the level constant 125 -Hz bandwidth analysis. Measurements were of the signal gets too low, it may be obscured by the record made on a disc that was cut with an unmodulated groove surface noise. These two conditions place upper and lower (no signal). About 30 dB of noise reduction is provided by bounds on music signal levels that can be stored on a vinyl the dbx Encoded Disc for frequencies below 10 kHz, which disc, resulting in a maximum dynamic range of 50 dB for encompasses the frequency band of greatest concern relative conventional pressings and up to 65 dB for the very best to record surface noise. The total wide -band noise of -57 dB pressings. is reduced to -85 dB, in this particular case, for an overall Record surface noise is generated as a result of the interac- reduction in surface noise of 28 dB. tion between the playback stylus and the record groove. There are a number of side benefits to dbx Encoded Discs. Modulations in the groove cause the stylus to undergo com- During cutting of an encoded master disc, the compressed plex motions that are translated by the phono cartridge into signal reduces the demands on the cutting stylus, resulting in

Fig. 8 - Diagram depicting the combination of signal compression during encoding and expansion during decoding that results in surface noise reduction and dynamic range retention on dbx Encoded Discs.

MASTER TAPE SIGNAL ENCODED DISC SIGNAL DECODED DISC SIGNAL

TRACING 75 15 1 +10 DISTORTION +10 i75 +75

0 0 0

0 -10

20 20 -20 20

t00á8 INPUT -gyp -0 100 tlB OUTPUT DYNAMIC DYNAMIC RANGE RANGE -42 5 - 4 2 5 -40 - 40 DISC -45 SURFACE NOISE -45

-60 - 60

AUDIO January 1980 -85 85 -- High fidelity is the sLmi total of audio experience. It mears not Lux R -1120A Tuner/Amplifier and our T-12 Turer both use the only superb styling but ease of operation. It also means the jay of Closed Lock Loop Tuning System. Sirce it's impossible to enjoy listenin, even in the midst cf a frenetic work schedule. Just turn mis'uned FM, or to relax when you have :o jump up and retune, on the system, relax and forget your proolerns and expe:ierce an Lwx has perfected frequency control. audio happening. While most quartz loc K systems operate on the front end only, The total audio experience can't be gteaned from specifica- Lux goes further, with Closed Lock Loop controlling the front end, tiors. it must be heard .. felt. 3acause many Lux original the .F and detector circuits, with strong, instantaneous corrective technical developments enihaice the experience, they are not feedback to the exact ce.nte- of the desired frequency range. easily specified. Mother locking circuit, Acc_i-lockTI'l physicality locks the tuning The Lux L-11 Integrated Amplif er uses Realtime Processed DC knob at the desired point. Not only does Lux's system deliver Amplifization. In a convent/oral amplifier, a capacitor is used in perfect tuning, it retains tne last tuned frequency even when the the negative feedback oop toeliminate wave form distcrtion, but power is turned off and on. it ir turn triggers time lag causing phase distortion in the lower Lux PD -277 offers quality and convenience. Using a Lux frequer cy and transier t distortion in the higher frequency. Lox's designed, servo-controtted brushless. slotless mar:cr, wow and approach to this problem as see -i in the Model L-11 was to drop fI Jter is extraordinarily low .at 0.03Y° while signal-to-noise ratio the capacitor from the negative fieedback loop; thus eras/n3 the is 60dB. time lag causing phase and transient distortion. DC drift was ether outstanding features are a straight low mass tonearm solved oy the use of Lux's exdluisive DML-IC (dual monolith c aid vertical pivot construction for minimizing resonance and linear integrated circuiit). ir stability. Lux 5K50 Cassette Deck uses our BRBS System. Bultdinig a Quality and convenience are evidenced by electronic controls superb cassette deck needs note technology than standard for all major functions and a separate motor for the tonearm decks. To make the mcst o tt-e unit's 3 -head design, the BRBS e irninates noisy, friction -producing I nkage. variable biais system is prcviced This Bridge Recording by These and other innovations are typical of Lux s outlook. But Bias Current and Signal Current avoids transient and none of this shows up on spec sheets. Only listen nit will prove phase shift distortion. that all of Lux is for your pleasure. See your nearest Lux dealer for a unique listening experience.

LUX AUDIO OF AMERICA, LTD. 16C. Dupont Street, Plainview, NY 11803 (516) 349-707C 11200 Chandler Blvd.. North Hloil ywood, CA 91603 (213)985-4500 In Canada: Lux Audio cf Canada, Ltd., Ontario Due to the tremendous response from consumers, Lux has decided to extend the Great Rebate Program from December 31,1979 to January 31,1980. 1

Kill FM Interference With Two Antennas

Richard Modafferi

FM listeners often wish to tune in a same mast will not work. Consider first Fig. 1 - Phase -cancelling antenna distant station which is adjacent -chan- the case where the two stations are at system. Desired and undesired nel or co -channel to a stronger local different compass directions from the stations at different compass headings. signal. Often no amount of tuner receiving location (Fig. 1); they may be selectivity or capture ratio will enable co -channel or adjacent -channel. Point Fig. 2 Use of an existing TV antenna, reception of the weaker signal. both antennas at the desired station - or existing TV -FM cable signal, Adjacent -channel reception is par- and adjust their horizontal separation combined with the FM antenna in a ticularly difficult, and tuner designs 30 until the undesired signal cancels out. phase -cancelling system. Place the years ago did not permit adjacent - It is easy to obtain as much as 60 -dB attenuator in the cable to the stronger channel reception. Indeed, when the rejection of the undesired signal with of the two undesired FM signals. FCC set up broadcast standards for FM a phase -cancelling antenna of this transmission, adjacent -channel recep- type. As long as the two stations are at tion was considered impossible. To- different compass headings, the Fig. 3 - Easy, "quickie" phase - day, FM tuners can be built with 100 scheme will work easily. If the stations cancelling scheme that will work in dB adjacent -channel selectivity. are in the same direction from the re- many cases. Hook the rabbit ears to The improvement in tuner selectivi- ceiving location, the problem is more the splitter with any convenient ty has unfortunately not been fol- difficult. This special case will be dis- length of cable, and then walk around lowed by a reduction in the spurious cussed later. the room with antenna while emissions of FM transmitters in their watching signal strength of undesired adjacent channels. This interference Stations on Different Headings signal. You may need to place an attenuator in line to the FM cannot be tuned out by a selective re- Best performance is achieved using outside ceiver, since it is already spilling into two identical antennas on separate antenna. Juggle attenuator settings the desired channel at the transmitter masts. All connections are made with and placement of the rabbit ears for end. coaxial cable of the same length and minimum interference on the desired Co may station or minimum pickup the -channel interference also type. Arrange the antennas as in Fig. 1. of be a problem. You may live between Calculate the distance between the undesired station. This scheme fails when the two stations, or in the middle of a tri- antennas, as attenuator setting becomes large angle of three stations, and wish to D (meters) = 300 - 2f (MHz), enough to kill the desired signal. receive just one of them. Instead, you where the frequency, f, is of the unde- get all at a once, even when using sired station. Fig. 4 Phase -cancelling system using directional antenna and - rotor. For example, if the undesired station two identical indoor antennas. A pair Hope still exists for the listener fac- is on 100.1 MHz, the distance D will of B1C Beam Boxes should work well, ing these reception problems; the so- come out to: but the author hasn't tried them. lution involves erecting a second an- D=300_ (2 x 100.1) Move and adjust the two antennas for tenna. or about 1.498 meters or 4.92 feet. best results. Physical spacing of the It may be easier to measure the dis- antennas should be large, at least 10 Method tance d between the two antenna feet, or on opposite sides of the room. We call this method a "phase -can- masts; this is given by: celling" antenna system, and it is often d=D= sin e Fig. 5 Scheme to the used in military and commercial point- where 8 is the angle between the de- - try if desired and undesired stations are in to-point communications systems sired and undesired stations (Fig. 1). the same direction (zero degrees) or opposite where interference must be minim- What happens if you do not want to directions (180 degrees). The idea is to ized. Two separate receiving antennas crawl all over your roof with protrac- obtain vertical spacing of the antennas are connected such that the desired tors and slide rules, putting up masts, so both pick up the strong undesired signals add in phase, and the unde- or digging up your back yard and put- station, but only the big antennas on sired signals add out of phase. Thus, ting in expensive tower foundations? the tower picks up the weak the wanted signal is reinforced and the Is there an easier way? undesired station. Connect antennas interfering one eliminated, or nearly There are some simpler tricks, which as in Fig. 3 and then adjust the so. won't work as well, but often give ade- position of the indoor antenna and In order for the system to work, the quate results. An existing TV antenna the setting of the attenuator of the antennas must usually be physically can be combined with the FM anten- outside antenna for best results. separated in a horizontal direction. na, if they are on different masts. You Mounting the two antennas on the may even use your existing FM anten- (a) Layout for phase -cancelling antenna system using (b) Electrical hookup for the phase -cancelling system two identical antennas. shown in (a).

TWO-WAY 75 St 1HYBRID SPLITTER 000 o

75UUCOAX TO TUNER SAME LENGTH AND TYPE OF 75 !t COAX FROM SPLITTER TO EACH ANTENNA

TV -FM BAND SPUTTER ANT TV TV INDOOR SET RABBIT TWO-WAY FM EARS FM ATTENUATOR HYBRID ANTENNA SPLITTER TWO-WAY

HYBRID -->ir +O FM Bil SPLITTER 0 0 0 TUNER FM OUTSIDE TUNER FM ADJUST LENGTH OF CABLE RUN ANTENNA TO MINMIZE UNDESIRED STATION ATTENUATOR 2 3

OUTSIDE ANTENNA AIMED AT TWO IDENTICAL r o O 0 UNDESIRED STATION INDOOR ANTENNAS 0 0 TUNER ITWO-WAY HYBRID SPLITTER 4 5

INDOOR ANTENNA AIMED AT UNDESIRED STATION

AUDIO January 1980

Stop Listening ToPanet

And start listening to music exceptionally responsive. We've also added a flux as you've never heard it before. So it can put out sound normalizing ring that reduces Completely free of the without adding to it. distortion by 20dB. And auto- spurious vibrations caused by matic overload protection. conventional paper cone The end result is a speaker speakers. capable of a level of perfor- Mitsubishi has eliminated mance literally unheard of those vibrations by eliminating until now. the paper. If our honeycomb speakers Instead, we build our woof- sound too good to be true, er cones with an aluminum test listen to them and judge honeycomb core in a sandwich for yourself. of glass fiber. It's what you won't hear Unlike paper cones, the that will impress you. honeycomb structure is rigid And since the glass fiber is MITSUBISHI® enough to maintain its shape, non -porous, it gives our air sus- AUDIO SYSTEMS yet light enough to be pension speakers a perfect seal, and a lower resonance frequency for better bass response.

Mitsubishi's Honeycomb Speakers. MS -10 10" 2 -Way Bookshelf. MS -20 12" 2 -Way Bookshelf. MS -30 12" 3 -Way Bookshelf. For more information write Melco Sales, Inc., Dept. 40, 3010 East Victoria Street, Compton, California 90221. For the name of your nearest dealer, please call (800) 621-5199 (in Illinois, (800) 972-5855). In Canada, contact: Melco Sales Canada, 900C Denison Street, Markham, Ontario. L3R 3K5. Enter No. 27 on Reader Service Card na and a piped -in cable FM signal to "quickie" setup that actually worked Stations on the Same Compass cancel an unwanted local FM station. at the author's home used the method Heading Both of these schemes are outlined in of Fig. 3 to cancel a local station three If the stations are on the same com- Fig. 2. You must be prepared to do miles away and allowed the reception pass heading, you are in trouble be- some tedious cutting and adjusting of of an adjacent -channel distant station cause the distance d (Fig. 1) becomes the lengths of the cables from the sig- 140 miles away. infinite as sin 9 = zero. Even my back nal sources to the tuner. Adjust the If you are apartment -bound and yard on top of a country mountain cable length from one antenna for cannot put up outside antennas, a isn't that large! minimum undesired signal, and then scheme using two indoor antennas in Here is a trick that may work when set the attenuator to further minimize a phase -cancelling hookup may work. the angle between the stations is near the undesired station. Set up the two antennas as in Fig. 4, zero degrees, i.e. they are in the same Sometimes simple rabbit ears can be and move them around until the un- direction. Try a large vertical spacing used as a phase -cancelling antenna, as desired signal is minimized. Cable FM between the antennas (Fig. 5). This in Fig. 3. This scheme will work well combined with an indoor antenna scheme works especially well if the de- only if both signals are fairly strong. A may also work, as in Fig. 2 earlier. sired station is distant and the undesired station is local. The big outside antenna picks up both stations, and the indoor antenna picks up just the local, allowing cancellation to work. If the desired station is very weak, it may not be possible to effect cancellation with the attenuator; the cancellation may be just right when the desired station disappears into the noise! Stations located at an angle e = 180° Quality Music, Quality Pressings, Quality Sound (opposite directions from the receiving location) are a little easier to handle. If your antenna had an infinite front -to - Nautilus Halt-Speed Mastered Series back ratio, a phase -cancelling system would not be needed, so the first thing (fe to try is a better antenna. If your antenna has the best possible front -to - back ratio and still you have interfer- 72 ence, the phase -cancelling scheme of Fig. 5 will work. Results are best if the undesired station is nearby. Conclusion

While at McIntosh in 1970-1972, I received requests from FM listeners to solve reception problems just discussed. Today letters still come; phase - cancelling antenna hookups do work for those willing to make the effort to try them out. I purposely avoided too much technical detail here. If you want to try an elaborate phase -cancelling antenna, it is best to work through a local TV -FM dealer experienced in exotic antenna systems. Realize that you must really want that distant station, so write that station's management and ask if they Nautilus Recordings announces the second of its intend to keep the program format you like so much. Imagine the frustra- Half -Speed Master Series. These high quality discs are tion after putting up two $1,000.00 from produced the original master tapes, mastered at towers in your back yard to pick up half -speed to insure maximum fidelity and then pressed on that elusive classical station 150 miles 100% virgin vinyl to bring you all the music. away, and just as you finish they Available now: Dreamboat Annie (Heart). Coming soon: switch to the same taped disco format Half -Speed Master Series - America, Pablo Cruise, Joan that's on the station you were trying to Baez, Seals & Crofts, Loggins & Messina, Blood Sweat & cancel! Tears, Joni Mitchel; Direct Disc LP- John Klemmer; Listeners with specific reception problems questions Digital LP- Tim Weisberg. or may write to me for more information, and I will be Expect more from Nautilus Recordings. glad to help. (Note: If I'm flooded with letters, the replies may be slow.) Nautilus Recordings Write to Rich Modafferi, c/o Electroacousti- 761 Shell Beach Rd. cal Labs, Inc., 16 E. 42nd Pismo Beach, CA 93449 üUltilUt Street, Suite (805) 773-1848 recordings 918, New York, N.Y. 10017. Gj Dealer Inquiries invited AUDIO January 1980

Enter No. 29 on Reader Service Card If you don't have at least $1,000 to spend on an Audiovox Hi -Comp autosound system, read no further.

By Robert Harris, Technical Director 314" precision 3" mid -range with molded gasket 4 power -matched speaker systems. There are few things in this world high flux density ferrite magnet 11/2" high efficiency that can take a driver out of the horn loaded tweeter The ultimate is the Hi -Comp 362 traffic jam or away from a gas with strontium magnet system: 6" x 9'r three way speakers with line, better than great music, well 11/2" Strontium horn tweeters, 3" mid- reproduced. ranges, 20 -ounce Strontium magnet woofers, 11/2" heat proof aluminum Audiovox understands this. That's voice coils, and a 70 to 18,000 Hz why they engineered the Hi -Comp response range with crossovers at 2,900 range of high fidelity stereo and 9,000 Hz, and a power capacity of components designed to produce 70 watts. Hook these up to the exemplary sound in automobiles. HCM-0010 with the Hi -Comp power A total range of exotic amplifier, HCB-830, 120 watts RMS at amplifiers/receivers. 6" x 9' woofer, less than 0.3% distortion, and you've butyl rubber got enough sound to pop a moon roof. Each model builds on the one before it suspension until you reach the HCM-0010 - the "master system." 20 oz. strontium magnet 11/2" high temp. with thick 8 mm plates aluminum SV wire voice coil

HCS-362 HiComp 6" x 9" 3 -way speaker system.

built-in quartz clock and an automatic station seek. It also features a Cr02 HCE-750 HiComp Semi-parametric graphic equalizer switch, Dolby®, FM muting, 4 -way stereo balance controls, separate bass It's an electronically -tuned AM/FM and treble controls and a Hard HCB-830 HiComp 120 watt 4 -channel power amplifier multiplex receiver with a built-in auto- Permalloy tape head. Its looks are reverse cassette deck. The HCM-0010 straight out of a stereo buff's music Now for the equalizer. has 12 -station memory, LED display, room. Apart from a heavy-duty fader control or a dual slide -bar pre -amp, the only

Micro -processor controlled other Audiovox Hi -Comp component Dolby - Noise Motor Driven electronic synthesizer Reduction circuits Fader control you might buy is the HCE-750 semi -parametric graphic equalizer Electronically governed Low distortion audio with 5 slide -bar response controls and pre -amp circuits tape speed control bi -amp capability. LED display of frequency or time You spend $1,000 and what do you get? Probably the finest sound you've heard, anywhere. It takes money to get it. But it also takes a lot of specialized dedication. Audiovox only knows how to do just one thing: How to engineer the finest automobile sound systems

PhaseLuck Loop you've ever heard. FM quadrature detector For further information, write to: Robert Harris, Technical Director, Dept. AU , Switchable 120/70 u sec. tape equalization Audiovox, 150 Marcus Blvd. Hauppauge, Dual -gate MOS/FET FM Front end New York 11787. Auto -reverse cassette mechanism Hard Permalloy is Dolby Tape Head Dolby° a registered trademark of Computer -grade tuner Laboratories, Inc. function switches Patented design panel The Audwv©x HCM-0010, developed by the aadiu research laboratories 39 functions controls of the Shintom Company, Ltd., Yokohama, ,japan. 1979 Audiovox Corporation

Enter No. 8 on Reader Service Card THE RATIONAL AMPLIFIER, FROM CROWN.

Sound reproduction systems of the below a critical level or the transistor From the work done on this instru- 1980's will include "smart" compo- will be damaged, an expensive and ment, Crown developed the mathe- nents-components that react to their bothersome event. matics of output device behavior environment, that know how to pro- needed to design the computer -con- tect themselves, and know how to trolled protection system of the keep functioning in that environment. SA2 amplifier. That system makes it They belong in your future. possible, for the first time, to utilize The Crown Distinction SA2 stereo fully the capabilities of power tran- power amplifier is a rational ampli- sistors in an audio amplifier. fier. It analyzes its own behavior in On -board computing. terms of its immediate environment. The SA2 protected -power system It protects itself. It keeps on driving starts with the output transistor data your speakers with power reserves developed by Crown, which is now in that may amaze you. It's available now. computer memory at Crown. Analog The SA2 has four on -board com- computer circuits built into the SA2 puters that constantly monitor and Audio circuit designers have are programmed from data about the control the performance of the amp. always known that SOA is difficult to SOA of the output devices. The on- The SA2 knows when it can use measure, since it varies widely de- board computers obtain real-time its full power capabilities, and when it pending on what the transistor is input from sensing devices which re- has to cut back in order to prevent being asked to do. Designers have port current, voltage and thermal damage to itself. had to estimate arbitrary limits for behavior of the output transistors. The SA2 is sonically so accurate output voltage or current in order to The computers then describe, in real that its distortion and response levels protect output transistors, leaving time, what the transistors have been require highly sophisticated test in- much of the capability of the power doing, what they are being asked to struments to measure. However you transistor unused. Such designs are do, and compute whether the result measure them, the SA2 translates not as efficient as the SA2 has of all that could drive them outside into beautiful music. proven to be. their SOA. The incorporates new SA2 system SOA measured by Crown. engineering concepts that won't easily be duplicated. It is unique. Crown's engineers several years ago developed a special test instru- SOA-it's important! ment to accurately measure the The safe operating area (SOA) of a changing SOA of power transistors power transistor is defined by the under varying loads. To the best of internal temperature of the transistor. our knowledge, it's still the only such That temperature must be kept test equipment in the audio industry.

Monaural Output Power: SPECIFICATIONS 700 WATTS MINIMUM RMS INTO AN Stereo Output Power: 8 OHM LOAD, 20Hz-20KHz AT A RATED 220 WATTS PER CHANNEL MINIMUM RMS SUM TOTAL HARMONIC DIS- If the on -board computers predict RMS (BOTH CHANNELS OPERATING) TORTION OF 0.12% OF THE FUNDA- operation outside the SOA, the out- INTO AN 8 OHM LOAD, 20Hz-20KHz AT MENTAL OUTPUT VOLTAGE. put is limited automatically and im- A RATED RMS SUM TOTAL HARMON- 440 watts minimum RMS into a 16 mediately. The computers also limit IC DISTORTION OF 0.05% OF THE ohm load, 20Hz-20KHz, at a rated RMS output only to the degree necessary, FUNDAMENTAL OUTPUT VOLTAGE. sum total harmonic distortion of 0.08% so that output power is always at the 350 WATTS PER CHANNEL MINI- of the fundamental output voltage. maximum safe level for the existing MUM RMS (BOTH CHANNELS OPERA- 1200 watts at 1KHz into a 4 ohm load, environment. The limiting is self- at a rated sum total harmonic distortion TING) INTO A 4 OHM LOAD, 20Hz- correcting, and full output power is of 1.0% of the fundamental output voltage. 20KHz AT A RATED RMS SUM TOTAL Stereo Hum and Noise: automatically restored as soon as HARMONIC DISTORTION OF 0.08% 115dB below rated output, "A" weighted. the demands on the output devices OF THE FUNDAMENTAL OUTPUT Stereo IM Distortion: no longer threaten their SOA limits. VOLTAGE. Less than 0.01% from 0.25 watts to 220 All this happens in micro -second 600 watts per channel minimum RMS watts into 8 ohms per channel. time, with the output devices being (both channels operating) into a 2 ohm Stereo Slewing Rate: constantly checked. load, at 1KHz; rated RMS sum total Greater than 30 volts per microsecond. Continuing safe output. harmonic distortion of 1.0% of the funda- Stereo Frequency Response: mental output voltage. +0, -1.5dB, DC- 80KHz. Output power is never, in the Crown SA2 system, limited arbitrarily. Your 11111111111

SA2 continues at full power as long audio speaker protection is provided the factory, and a certified proof -of - as output transistor safe operating by monitoring the output and turning performance report is attached, area is not violated. Where other off the affected channel if necessary. detailing the measured specifications amps would simply thermal out and Indicating dynamic range. for your SA2, which are often better shut down, the sensing and protec- You will be pleased at the elegant than the published specifications. tion concepts employed in the SA2 concept of reporting music peaks in Every SA2 is also covered by the full keep the maximum safe power the Crown SA2. The vertical LED Crown warranty, by which Crown flowing to your speakers under any meters on the front panel actually guarantees, at no cost to the current and all conditions. display two values for each channel. owner, repair or replacement of any SA2 which does not perform to Unique heat sink design. The top light will always be a peak - original, published specifications for a The Crown SA2 heat sinks may be hold display with a four second delay. period of up to three years from new to most home audio system The other light, which may be coinci- date of original purchase. owners. The finned aluminum chan- dent with the peak -hold indication, This warranty also covers round-trip shipping for nels in these Crown -made heat but is usually below it, is a running the unit. We sinks are much more efficient than peak indication. The differences believe that this protection for your investment is castings because they rapidly dissi- between those two will enable you to the finest available anywhere. pate large amounts of heat to keep evaluate the dynamic range available We think the SA2 is quite simply the SA2 at its most efficient thermal in the music source. the finest audio power amplifier you level. In addition, a rear -mounted Built by Crown. can buy, one which will expand your fan keeps a gentle flow of air moving The SA2 is a Crown product. If you're musical horizons. But before you through the amp. If the chassis new to high -quality audio systems makeup your mind, you may want should heat up, the fan automatically that may not mean much, so we sug- more information. You can examine shifts to a higher speed until the amp gest you ask an experienced friend the SA2, and the product manual, at returns to a cooler operating level. about us. He will tell you about the your nearest Crown Distinction dealer, Crown reputation for reliability, for or you can send us five dollars with sonic excellence, for service. We're the coupon and we'll send you an proud of that reputation, so we work SA2 manual. If you return the manual, very hard to uphold it. we'll return the five dollars. Crown Care. Listen to the Crown SA2. It's a Every SA2 is thoroughly tested at rational decision.

And much more. When we rational designed our Name amplifier, we didn't stop with the in- To: Crown International novative protection The system. SA2 1718 W. Mishawaka Road Address is built around a carefully thought Elkhart, IN 46514 out circuit design that contributes to City immeasurably low distortion. For Please send:

instance, a junction field-effect tran- I . An SA2 manual. My five State zip sistor (J-FET) input is incorporated dollars is enclosed. into a multiple feed-back design to A free brochure. Phone reduce noise and distortion while offering perfectly controlled transient response. The main power supplies and transformers for each channel are separate. The SA2 mechanical design emphasizes sensible weight distribution and easy handling. The crown Crown IOC distortion indicating system notifies you about deviations in 1718 W. Mishawaka Road, Elkhart, Indiana 46514 output waveform before any kind of distortion becomes audible. Sub - Innovation. High technology. American. That's Crown. EDUCATIONAL MAT -:N. 24.13%

handle 4-shadow

screw

41.

76 90%

Tonearm Geometry and Setup

Martin D. Kessler and B. V. Pisha geometry. One would assume there would at least be agree- Optimum geometry of tonearms has been the subject of ment on this design parameter. Recently, Paolo Nuti used several articles over the past three decades, the earliest com- simple trigonometry to present some easy -to -use equations plete mathematical study being that of H.G. Baerwald in his for measuring and calculating lateral tracking error, and pro- paper on optimum geometry in 1941, where an analytical vided a program for use on the Hewlett-Packard 67/97 scien- study of tracking error distortion showed that optimum ge- tific programmable calculators. ometry of a tonearm of given effective length will have a Baerwald found "that both absolute and nuisance effects corresponding offset angle and overhang. Further, the arm of tracking distortion are considerably greater than common- should zero at two positions on the grooved surface of a ly assumed, published values usually being underestimates, phonograph record given the minimum and maximum radii due to omission of rigorous procedure." Basically, the abso- where the signal will be encountered. Recently the subject lute error of the tracking angle is not important but rather, has been brought up by The Audio Critic, and in surveying the weighted error which is the angular error divided by the the literature, we found papers on the subject of lateral groove radius. The idea is to reduce the weighted tracking tonearm geometry by B.B. Bauer in 1945 and John Seagrave in error over the entire grooved surface - minimizing the peak 1956/1957 that presented data essentially the same as that of weighted error. Baerwald derived his formulae from a sec- Baerwald. Seagrave stated in his paper, "Hear, then, the sad ond -order Chebyshev approximation used in electric wave facts: Few of the commercially available arms are designed to filter design. As angular error increases, so does stylus fric- give minimum tracking distortion on the largest LPs they are tion, according to Baerwald, where the vertical component of supposed to handle!" Consumer Reports in 1956 stated in a friction increases in direct proportion to the angular error. survey of high-fidelity pickups that "the best performance The higher the stylus friction (angular error), the greater the was often obtained when an overhang other than that rec- skating force. A pivoted tonearm with zero tracking error ommended by the manufacturer was used." In these "mod- (tangential type) will maintain a constant stylus friction for a ern" times of computers and high technology, it is interesting given recorded velocity. In order to get a fixed offset arm to note, according to our calculations, that only a small group (most commonly available) to have as near constant friction of manufacturers of tonearms are utilizing optimum lateral as possible, the angular error over the grooved surface would lift

cartridge overhang

LI 46% "width"- - 77

DemystifÏed WAYNE BRESSLER

have to be minimized. With Baerwald's equations, there will 2r,r, be slightly more overall angular error than in an arm optim- Large null radius- \ (1 b) (1- (1+Y2/11 ized for angular error but, for most arms available, the opti- )r, r, ma weighted error equations still result in lower overall an- where r1 and r2 are the inner and outer maxima of encoun- gular error. With simple signals, for instance a sine wave, tered signal. The equation for optimum angular offset is giv- distortion is essentially second -order harmonic. This kind of en by: distortion is not a grossly unpleasant sort, but when repro- r, + r, Sin (a) opt ducing music, - +r2 \' 1 (2) simple signals are usually not encountered. L(, With the complex signals of recorded music, according to + 1JI r, r, Baerwald, second -order cross -modulation products are the ILJ prevalent distortion components. Cross -modulation distor- where a is the angle of the offset for the tonearm in degrees tions according to The Audio Critic are " time -dispersive and and L is the effective length of the tonearm. The equation for therefore much more audible and disturbing." optimum mounting center is given by: Geometric Considerations Mounting center = r,(L'+r)-r,(L2+r) (3) r, -r, Basically, optimum geometry can be summarized in three simple equations - the determination of null radii, the opti- where L is the effective length, r, is the inner null radius, and r2 is the outer null radius. mum offset angle, and the optimum overhang for a given effective length. The equation derived through a second -or- From the above equations optimum tonearm pivot -to - der Chebyshev approximation for the position of the null turntable spindle distance (mounting center) can also be radii by Baerwald is given by: determined from the law of cosines: 2r, Small null radius Mounting center = L-+r;+2Lr, cos - (1(la) a) / (90-a) (4) (1+_\/12,-)r, + (1 -) r, where L is the effective length, r1 is null radius 1, and a is the offset angle in degrees. AUDIO January 1980 The following is an actual numerical example. Given r, =- rectly proportional to the weighted error and inversely pro- 2.375 in. (minimum groove radius) and r2 = 5.75 in. (maxi- portional to the groove radius. To find the exact angular error mum groove radius), then of a given arm, given the offset angle, the effective length, and the overhang for any given groove radius, the equation Null radius 1 from (la) = is: 2x2.375x5.75 [ R=+L-(L-OH2)12RL Angular error = 90 -OA -arc cos L (1+ 1 )x5.75+(1 -1x2.375 (6) \\- where R is the radius for which the error is to be found, L is

2.6 i n . the effective length, OH is the overhang, and OA is the offset Null radius 2 from (lb) = angle. 2x2.375x5.75 Given an arm of 9 -in. length, an offset angle of 24 degrees, 0.62 in., calculate the angular error for a (1 x5.75+(1+-1 x2.375 and an overhang of 4- in. radius. 1 ) // from (6) 4.76 i n . Angular error = The above results are the optimum values for the mini- -2.17 mum and maximum signaled grooves encountered on a 12 - 90 -24 -arc cos [42+9'-(9-0.62)212x4x9 = degrees. in. LP. One of the major problems when calculating optimum de- Given an effective length of 9 inches, calculate the offset parameters occurs with the source itself. What are the angle. sign minimum and maximum groove radii that will be practicably Sin (a) opt from (2) = encountered? A number of years ago this would have been a 2.375+5.75 difficult problem, because the record manufacturers had not standardized on the record sizes. Since 7-, 10-, 12-, and 16 -in. 9x ` 2 / + 1J records were being produced, arm geometry had to be a 2.375x5.75 C(2.375+5.751= compromise. Now that all are using a standard 12 -in. format 0.4088. for high-fidelity use, the problem boils down to settling Therefore the arc sine of 0.4088 = 24.13 degrees. where the inner groove is to be. Practically all records have From the offset angle and one of the null radii, calculate an outermost groove radius of 5.75 in. (146.05 mm). The in- the mounting center of the tonearm. nermost groove on some records has run almost to the record Pivot -to -spindle distance from (4) = label, which is at 2 in. NAB standards call for a minimum of records, aimed at the audiophile -02+2.6=-2x9x2.6xcos (90-24.13) 2.25 in. (57.15 mm). Most market, never reach 2.375 in. (60.325 mm), a more realistic 8.28 in. figure for high-fidelity use than the NAB standard 2.25 in. Overhang for the stylus is the effective length minus the Generally, the smaller the area over which the arm is to be in.). pivot to spindle distance (9 in. -8.28 in.=0.72 optimized, the smaller the peak weighted error will be. So, 78 angle to the Figure 1 shows the relationship of the offset within the limits of practicality, arms aimed at the audiophile center to the null effective length to the tonearm mounting market should be optimized for records whose grooves will radii. end up between 2.375 in. and 5.75 in., as proposed by Bauer. These values give null radius positions of approximately 2.6 Radii Null in. and 4.76 in. (66.04 and 120.9 mm, respectively). On a record surface a pivoted arm will traverse an arc. this arc, with most arms, the stylus will go through Through Effective Length two points where the stylus is tangential to the groove - in Effective length of the tonearm is the distance from the words, there will be zero error at each of those two other pivot of the arm to the cartridge stylus tip. This dimension is In addition, the stylus will encounter maximum error, points. almost always determined from the design specifications and depending again on the design of the arm, in three places. is very difficult to measure accurately once the tonearm is arms have near zero error at the beginning and end of Some assembled and the cartridge mounted. Generally, as effective the record, creating a larger error in the middle. To find the length increases the tracking error decreases a pivoted radius of greatest angular error between the null radii, given - tonearm of infinite length will have zero tracking error. Since the effective length and the overhang, the equation is: it is impractical to make such a tonearm, most manufacturers of greatest angular error between nulls = Radius design their products' effective length with other factors in -\/L2-(L-OH)- (5) mind such as effective mass, resonance, the size of the turn- as where L is the effective length of the tonearm and OH is the table base upon which the arm is to be mounted, as well overhang: decreased tracking error and distortion. From a design stand- Given an arm of 9 -in. length and an overhang of 0.5 in., point, it is desirable to have the longest effective length prac- calculate the radius or maximum error between the nulls. tical. Radius of greatest angular error from (5) = -192-(9-0.5)2'=' 2.96 in. Overhang a the distance Note that the greatest weighted error will not occur at the Overhang is figure derived from subtracting from the pivot to spindle center from the effective length of same point as angular error but will be quite close - its Except for a small number of arms with an ad- solution is determined by an iterative technique and will not the tonearm. be discussed here. justable pivot, once the arm is mounted and the overhang is If arm is mounted An arm will have two maximum error points if it is made to set, the effective length fixed. the length will be that zero at or near the innermost groove and somewhere in the precisely at the correct point, the effective middle of the record. Most arms are designed this way. Opti- which was intended. mum arm design has the maximum error at three points - From equation 3 it can be seen that the mounting center of the outermost groove, the innermost groove, and between the tonearm is a precisely determined figure in a mathemati- the null radii. Again, it is not angular error but weighted cal relationship to the other lateral components of the arm. error. With optimum design the weighted error is the same However, our study reveals that most tonearm manufacturers for each peak. As in Baerwald, the tracking distortion is di- appear to have overlooked this figure in their production of AUDIO January 1980 KEF Model 304 KEF Model 303 on optional stand ULS II on optional stand ULS I Elegant, Efficient, Effective.

The traditional KEF accuracy in music reproduction now combined with a higher level of efficiency Whether for use with amplifiers up to 100 watts or music centers as small as 10 watts, the two new KEF speakers-Model 303 and Model 304-can achieve surprisingly loud volume levels without any sacrifice of the tonal quality for which KEF is world-famous. Visit your authorized KEF dealer for a thorough demonstration. For his name and product information write to: KEF Electronics, Ltd., c/o Intratec, P.O. Box 17414, Dulles International Airport, Washington, DC 20041. In Canada: Smyth Sound Equipment, Ltd., Quebec J4H 3V7.

The Speaker Engineers Enter No. 23 on Reader Service Card tonearms. As an example, many of the Japanese arms listed in es, tracking error may be reduced at that point but it may not

Table I have a specified overhang of 15 mm. Unfortunately, be optimum. The second null radius usually ends up in a the only effective length that will optimally have an location that will prevent optimum tracking distortion char- overhang of 15 mm is 274 mm (10.787 in.), a length larger acteristics over the entire record. than many turntable bases can practically accommodate. A major problem is locating the precise pivot position on the Offset Angle as seen in Fig. 1, is taken turntable base. Most manufacturers of separate tonearms The offset angle of the tonearm, an imaginary line drawn from the pivot center through have failed to supply a precise means of locating the tonearm from on the turntable base, thus negating the parameters designed the stylus tip and a line parallel to the cartridge body through into the tonearm. In our opinion, it behooves the tonearm the stylus tip. Basically, this angle is a result of design specifi- and not a measurement after the fact of assembly. If manufacturers to supply a means of precisely locating the cation mounting center for their tonearm so that the carefully de- the effective length, the overhang, and one of the two null signed parameters are maintained. Therefore, assuming that radii are known, the offset angle can be easily determined by triangle. All the factors fit together like a the tonearm pivot is mounted correctly according to the the solution of that manufacturer's specification, the overhang template supplied jigsaw puzzle - a wrong dimension simply will not fit. For an 229 mm, an overhang with the tonearm may be valid for the design of that tone - example, given effective length of offset arm, though not necessary optimally. Should the mounting of 15 mm, and a null radius of 60.325 mm, calculate the hole center be located wrongly, the overhang templates will angle of this tonearm. most probably be invalid for the tonearm. In order to de- Offset angle = crease the possibility of imprecisely (ocating the tonearm pivot, some tonearms are designed with an adjustable pivot 90 -arc cos /2292+60.3252-(229-1512\ _ 21.85 degrees. that is used after the tonearm is mounted. Generally, a slot is 2x229x60.325 J made in the mounting board, located lengthwise along the line extending from the spindle center to allow for maximum The manufacturers of the tonearms listed in Table 1 sup- range of adjustment. On tonearms whose pivots are fixed the plied the effective length, overhang, offset angle, and null manufacturer has included two mounting slots in the head - radii for their tonearms. The submitted data was checked to shell so as to permit sliding the cartridge to the correct posi- ascertain that the data were consistent. However, some of tion for the desired overhang. The adjustable pivot arms usu- the data supplied did not fit the specifications. In one in- ally have two round mounting holes in the headshell. With stance, the null radii were recalculated according to the sub- these arms, overhang distance is of little concern to the in- mitted data and were found to be different from those given staller, because the arm is usually zeroed in on a null tem- in the manufacturer's specifications. plate. With these arms, effective length will vary somewhat A common mistake among many audio dealers, advertising according to the cartridge used (most are standard 0.375 in. copywriters, and audiophiles is to attribute the geometry of 80 stylus tip to mounting hole center), but also the offset angle an arm to its shape. A tonearm shape is probably more the and overhang will vary with this type of tonearm. Since the result of industrial or artistic design than geometric consider- inner null radius on many adjustable pivot arms is 2.375 inch - ations. There really is no superior shape for tonearm geome-

EDGE OF RECORD TONEARM 6" PIVOT CENTER

/ OPTIMAL NULL RADIUS / (2.6")

MAXIMUM GROOVE RADIUS (5.75s)

OPTIMAL NULL RADIUS (4.76") \

Fig. 1 - Relationship of the lateral components of a tonearm. AUDIO *January 1980 If you can find a receiver

T. configurationthat 3imodal elec+.ro- doesDifferential Cerner channel more.18 LEDAnalog 3 stage IF ampli- LED func-ic r CCL power aensor relay current mir --,r and signal to digital fier incorporating indicatore amplifier with protection and loaded low noise s_rergth tuning loga-ittmic 3 linear phase fell? complemen- delay circuit input stage teeters power display ceramic filters ter). o-rtput stage with LED indicat on with differential ndication calikratted in limiter and watts and dBW quadrature detector

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Connections for 11 position Twin position 32 decent loga- 2 tape monitor ., 5 gang FM tun- 3 pair of speakers detent bass/ active subsonic rithmic volume with full tape ing capacitor midrange/treble and high filters attenuator cali- copy capability with twin tone controls brated in dB stage dual gate with variable MOS 1h l turnover fre- TRF amp quencies and by-pass

Scott's new 390R is perhaps the warranty is your assurance of lasting most complete receiver ever made. 1111 pleasure. A professional control center for it. For specifications on our complete line your entire sound system, the 390R delivers a full of audio components, contact your nearest Scott 120 watts per channel min. RMS, at 8 ohms from 20-20,000 Hz dealer, or write H H. Scott, Inc. Corporate with no more than 0.03% THD. And it offers more options, Headquarters, 20 Commerce Way, Dept. ER, features and flexibility than you'll find on most separates. Woburn, MA 01801. In Canada: Paco Electronics, Compare the Scott 390R with any other receiver on the market Ltd., Quebec, Canada. today. If you can find one that does i SCOTT more... buy it. Warranty Identification Car d Scott's unique, gold warranty card.

Warrant, Number 101101 Individualized with your warranty, Model. 3908 Rece -ver Saul NumberF. 304 7831l".62 1705 model and serial numbers, and expira- ! SCOTT Expranon Dale: September 15. 1981 tion date. Scott's fulh+ transferable, The Name to listen to: three-year parts and labor -limited Makers of high quality high fidelity equipment since 1947.

Enter No. 36 on Reader Service Card try since resonance, stiffness, mass, lateral balance, and tridge relative to the record surface. As the arm traverses aesthetics will determine the final shape. With these factors warps or is raised and lowered in the pivots for VTA, the in angle in mind, many of the tonearms in Table I can be optimized parallel plane is lost in proportion to the difference with little change in the production process. It would be false from perpendicularity from the plane of the cartridge. Visual- be up in the to assume that a correction in lateral geometry would have izing this isn't easy, but if the arm could rotated all tonearms looking alike because a change to optimum ge- vertical plane until it was straight up, the arm whose bearings ometry would be visually imperceptible and the general ap- were in alignment with the offset angle would have the front pearance would remain intact. of the cartridge still parallel to the record surface, whereas the arm not so designed would have the right front edge of Optimum lateral geometry is important, but other parame- the cartridge higher than the left front edge. The problem ters and considerations, such as mass of the arm, moment of becomes very complex with unipivots where, with fixed inertia, resonance characteristics, cartridge compatibility or bearing arms, the solution is simple. The resolution of the universality, tube stiffness, vertical tracking angle, bearings, vectors to bring about the same effect in the unipivot arms is etc., all contribute to the final sound of the arm -cartridge - complicated because of counterweight placement. Gener- turntable system. If factors such as those cited above are not ally, if the vertical bearings are in alignment with the offset properly executed, the contribution of optimum geometry angle, the problems with warp and VTA are made less severe will be lost. The improvement of sound resulting from opti- because a simple angle is generated, rather than a compound mum geometry is subtle but detectable, if it is not oversha- angle that is typical with many arms currently available. In dowed by other design errors. Even if optimum design is not addition, the height of these bearings is equally important for practical, it is to be hoped the tonearm manufactur- entirely minimization of warp wow. ers will make absolutely certain that the instructions for set- Table I seems to be divided on the issue of vertical bearing ting up their tonearm are detailed and correct according to angle. There should be no disagreement on the preservation design parameters. its of cartridge azimuth. At the moment we are not aware of any literature concerned with the problems of azimuth align- Bearings ment. Correct lateral alignment of vertical bearings is important for maintenance of designed geometry and cartridge azimuth. If records were perfectly flat, the angle of the bearings Tonearm Setup Errors affecting the vertical axis would not be critical. However, that Murphy's Law dictates that practical problems will arise is not the case, and with vertical tracking angle (VTA) adjust- both for the professional setting up audiophile quality equip- ments on some tonearms, the headshell will not remain par- ment and the user trudging through the tonearm manufac- allel to the record surface as the arm moves up and down in turers' sometimes confusing and inaccurate setup instruc- the vertical axis since the plane of the cartridge body changes tions. Typical problems that may arise in the course of an with respect to the record surface. If the angle of the vertical installation follow. 82 bearings is perpendicular to the line through the offset angle, 1. The cartridge has been pushed all the way forward and there will be only one angular change, that of the VTA. If, the proper overhang still cannot be achieved. however, the bearings are not perpendicular to that line, the 2. The overhang is correct according to the instructions, plane generated becomes a compound angle problem - the but the mounting hole was drilled in the wrong place. cartridge plane twists in two angles (azimuth changes). Bear 3. With a movable pivot arm, there appears to be too little in mind that when setting up the arm, the instructions usual- forward adjustment travel and the stylus will not reach the ly state that a mirror be used to check the front of the car- template null and "zero" simultaneously.

Explanation of Table I next column for reference is the maximally encountered an- The 22 tonearms listed are representative of the majority of gular tracking error. Generally the maximum error will occur arms currently available. Only three arms listed have their at the outermost groove. The next column is the maximum geometry optimized, using Bauer's criteria for inner and out- angular error for an optimum arm of the same length. On er maximum groove radii, when set up according to the man- occasion this figure will be slightly larger than the actual arm ufacturer's instructions. A number of the arms have been as designed (it was designed for angular error, not weighted optimized using Baerwald's equations, but used inner and error). The next column denotes the method of pivot loca- outer radii other than those proposed by Bauer. tion - if the arm is fixed, a round hole would be drilled; if The first five columns of figures represent manufacturer's adjustable, a slot to allow the overhang to be adjusted. The tonearm dimensions as supplied. Most of the data were sup- last column denotes whether the tonearm's vertical bearings plied by the manufacturers, 'and some were calculated. Note were aligned so that they were perpendicular to the offset that the closer the null radii are to 66.04 mm and 120.9 mm, angle line (yes or no). Since these figures represent "as set the closer the arm will be to optimum when set up correctly. up" dimensions, choice of arm should not be based on ge- The next two columns contain data from Table V for compar-, ometry per se, inasmuch as alignment devices such as the ison to what the listed arms would be ideally for their effec- jML and DB protractors and the Dennesen Soundtracktor tive lengths. The next three columns are the actual absolute give the installer a convenient way of aligning the arm -car- weighted errors in degrees per centimeter at the inner groove tridge system to optimum values. (60.325 mm), between the nulls, and the maximum radius The SAEC WE -308 SX arm design is based upon research (146.05 mm). Note that the weighted error between the nulls done by the Sansui Electric Co. The AES preprint 1390 (D-5) was calculated using an iterative procedure on a computer. derived the optimum pivot position from a kinematic point The next column contains the maximum optimum weighted of view, with the mass of the arm, the location of the center error for an arm of the given effective length. This error will of gravity, and the moment of inertia around the system's be approximately the same at the innermost, between the center of gravity. Resonance was the engineering problem nulls, and maximum grooves. For example, for an arm that being solved. For this particular arm, it is not advised to op- has a very low error at the innermost groove, weighted track- timize the geometry, or the resonance of the system will ing error will be compromised over the rest of the record. The change to such an extent that the arm will not track properly.

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c6r RE iQ TABLE II - Optimum parameters for two different 2. What happens when small errors in overhang occur? tonearms. Using the same optimum tonearms as in Table II, an error of +1 mm will be induced in the overhang. This kind of problem can occur if the arm is mounted in the wrong posi- Arm 1 Arm 2 tion but the manufacturer's instructions were to align the Effective Length 200 mm 300 mm Offset Angle 27.854° 18.149° overhang of the stylus with reference to the headshell. Since Overhang 21.055 mm 13.606 mm no cross checks are supplied, it is assumed that the job was Incidentally, Null Radii (for both arms) Inner = 66.04 mm; Outer = done correctly. almost no manufacturers supply - geometric 120.9 mm. the consumer with cross-reference checks for the arm setup, especially for those arms with particularly confusing instructions. Referring to Table IV, with +7.539 mm and Occurences such as these will frustrate even the most pa- tient audiophile and technician. Both will throw up their hands in defeat and assume the fault was theirs in that they Table Ill - Change in null radii when 0.4 degree is left out an important step. Although one should be as accu- added to the optimum offset angle of Table II tonearms. rate as possible with the setup, many times the instructions accompanying the tonearm are insufficient, in error, or poorly translated. The consumer is seldom aware of the geometric Arm 1 Arm 2 interaction of the lateral tonearm components; errors of a Effective Length 200mm 300mm degree here or a millimeter there go unnoticed or are consid- Offset Angle 28.254° 18.549° ered insignificant, while actually such errors have considera- Null Radius 1 63.293 mm 61.830 mm bly altered the geometry of the tonearm. Null Radius 2 126.059 mm 129.040 mm As a reference, it is important to consider the null radii. The positions of the radii actually represent the design of the arm being installed more than any other parameter. If after care- Table IV - Change in null radii when 1 mm is added ful setup, the arm does not "zero" on its designed null radii, to the optimum overhang of Table I1 tonearms. an error may have occurred either in setup or possibly on the drawing board. For the following discussion the relative Arm 1 Arm 2 changes of the nulls will be considered with respect to com- Effective Length 200 mm 300 mm mon errors in setup. Overhang 22.055 mm 14.606 mm 1. What effect does a "small" error in offset angle have on Null Radius 1 73.539 mm 79.955 mm null radii, and does arm length make a difference? Null Radius 2 113.349 mm 106.939 mm Referring to Table II, suppose the correct geometry of both 84 arms is altered by adding a 0.4° error to the offset angle, leaving all the other parameters the same except, of course, -7.551 mm translational error in the position of the null radii the null radii. The offset angles are changed to 28.254° for the small arm and +13.955 mm and -13.961 mm in the (27.854° +0.4°) and 18.549° (18.149° +0.4°). It is easy to make large arm, small errors in overhang become crucial. Actually, a 0.4° error; most people do it inadvertently. The results in if the manufacturer supplied an overhang template to check Table Ill show that with only 0.4° error, the small arm misses the overhang over the spindle, the problem would be minim- the nulls by -2.707 mm and +5.159 mm, while the large arm ized to a large extent. Overhang changes very slowly com- increases to -4.17 mm and +8.14 mm. Note that the longer pared to changes in offset angle and arm length. The length the arm, the more critical it is to get the offset angle exactly of overhang is more important than the absolute accuracy of right. Errors over two degrees may put the null radii some- the mount. Also, the longer the arm, the more critical the where off the record - hardly optimum. overhang dimension. Fig. 2 - Dual null radius protractor.

SPINDLE CENTER -

STYLUS 0.282" TIP 0.284"

NULL RADIUS 1 NULL RADIUS 2 2.6" 4.76"

AUDIO January 1980 ADC has four Sound Shaper® Lots less. ADC Sound Shapers will Two Mk II which functions in twelve frequency equalizers that will improve bring these "dead" spots to life. frequency ranges with a two -channel your sound system. No matter how Perhaps best of all, though, is LED meter. And there's our new good it is. And at a cost that's lots a Sound Shaper's ability to let Sound Shaper Three Paragraph/cTM less than trading in your components. you re -equalize what a recording Equalizer. ADC Sound Shapers will engineer mixed. If a horn section is It combines all the advan- improve your speakers. By extending overwhelming a piccolo, for example, tages of a graphic equalizer with all the true bass response, including you just slide the appropriate frequency the advantages of a parametric the critical mid bass. lever. Presto, more piccolo. You can equalizer. Twelve primary frequency ADC Sound Shapers will also vanquish a voice. Or boost a tuba. controls per channel. Plus twenty- improve the relationship between your Sound Shapers segment the four ancillary control positions per cartridge and speakers. From one of entire spectrum of sound. To let channel. The Sound Shaper Three partial incompatibility to total you re -shape a sound track to your is the ultimate in controlling and compatibility. personal musical preferences. It's all creating with your stereo system. They'll also eliminate rumble the control you've ever dreamed of but Take the ultimate step up in (low frequency overload), tape hiss never dreamed possible. sound, without trading in a thing. and record scratches. To get into equalizers, start ADC Professional Products, And that only scratches the with our Sound Shaper One which a division of BSR Consumer surface of what ADC Sound Shapers operates in five frequency ranges. Or Products Group, Route 303, can do. For instance, the walls, our Sound Shaper One Ten which Blauvelt, NY 10913. Distributed in carpeting and furniture of your gives you greater control by operating Canada by BSR (Canada) Ltd., listening room physically bounce in ten frequency ranges. Ontario. °Sound Shaper is a sound around so that some spots For more professional registered trademark of Audio have less sound than other spots. equalizers, there's our Sound Shaper Dynamics Corporation.

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Enter No. 1 on Reader Service Card 3. A movable pivot arm is mounted on a turntable with a errors that appear small can create large problems. Most predrilled mounting slot. In the course of moving the pivot setup procedures supplied by the tonearm manufacturers are towards the null template, forward travel stops in the arm inadequate given the tools supplied for the installation -a before the arm reaches the zero position on the template. paper template, whose accuracy is questionable, and many This is unfortunately a more common problem than might times a confusing set of instructions. The manufacturers be realized. A few of the more popularly priced direct -drive should consider providing a cross-reference check template turntables have convenient precut mounting boards. At this to validate the designed null radii. In tonearms that have a point, aesthetics got into the way of performance. Many continuously variable VTA adjustment, the lateral error might movable pivot tonearms are relatively short, e.g., 9 in. (229 be so far off that a change in VTA might never be heard. mm), and platters on the turntables are oversize, up to 13 in. diameter (330.2 mm). In order to preserve aesthetics and pre- Optimizing Tonearm Geometry vent a "cluttered look," the mount is located a comfortable If the tonearm is not optimized, do not be overly con- distance from the platter, and the slot center may be located cerned, since the result is not wholly fatal. It is feasible to at least 0.5 in. (12.7 mm) from where it should be. The result optimize the lateral geometry of the arm if it is already is that the arm probably ends up with its null radii off the mounted, but only if the arm is reasonably close in its record surface (a 3 -mm error will accomplish this). The actual overhang so that the optimization procedure will not com- results are the same as for example 2, where the offset angle promise the integrity of the arm -cartridge system. For exam- and effective length are "frozen" - the overhang gets the ple, on some adjustable pivot arms where the headshell has short end (no pun intended). no mounting slots, the cartridge cannot be twisted in the From the above it can be readily seen that even using care, shell to achieve a line-up with an optimum null radius template if both mounting screws are in place. (At least one dealer we know of connected a cartridge with only one screw in such an arm so as to achieve optimal geometry, but ended TABLE V - Optimum values for tonearms (200-250 mm) and angular error. up negating all of the good characteristics the arm had - a pyrrhic victory at best.) Another instance occurs in the arms Effective Optimum Optimum Actual Angular Error, deg. that have correct vertical bearing alignment with the car- Arm length Overhang Offset Inner Between Outer Angle tridge. Here, one has to decide on a compromise - on most mm inch mm inch deg 60.325 mm Nulls 146.05 mm arms designed with correctly aligned bearings, a change in azimuth is less critical than maintaining optimum ge- 200.0 7.874 21.055 0.829 27.854 0.927 -1.328 2.258 lateral 201.0 7.913 20.938 0.824 27.704 0.921 -1,319 2.244 ometry. Assuming the tonearm's mounting hole is within a 4.311 2.229 202.0 7.953 20.822 0.820 27.555 0.915 few millimeters of optimum and the headshell has slots to 203.0 7.992 20.708 0.815 27.408 0.909 -1.303 2.215 204.0 8.031 20.595 0.811 27.262 0.904 -1.295 2.201 allow the cartridge to be twisted and moved, the arm can be 205.0 8.071 20.483 0.806 27.118 0.898 -1.287 2.187 optimized by using a null radius template. On other arms, 206.0 8.110 20.373 0.802 26.976 0.892 -1.279 2.173 where is 207.0 8.150 20.264 0.798 26.835 0.887 -1.272 2.160 the mounting hole out of range, it is up to the user 208.0 8.189 20.156 0.794 26.696 0.882 -1.264 2.147 to decide whether the trouble warrants redrilling a new 86 0.789 26.558 0.876 -1.256 2.133 209.0 8.228 20.049 mounting board or leaving the arm as is. 210.0 8.268 19.944 0.785 26.422 0.871 -1.249 2.121 211.0 8.307 19.839 0.781 26.287 0.866 -1.242 2.108 Here it is necessary to discuss the tools that will be re- 212.0 8.346 19.736 0.777 26.153 0.861 -1.235 2.095 quired for the optimum tonearm-cartridge setup. Recently, 213.0 8.386 19.634 0.773. 26.021 0.856 -1.227 2.083 214.0 8.425 19.533 0.769 25.891 0.851 -1.220 2.071 three manufacturers have introduced alignment devices to 215.0 8.465 19.433 0.765 25.762 0.846 -1.214 2.058 accomplish an optimum tonearm-cartridge . setup JML 8.504 19.334 0.761 25.634 0.841 -1.207 2.047 - 216.0 Company, DB Systems, 217.0 8.543 19.237 0.757 25.507 0.836 -1.200 2.035 and Dennesen Electrostatics. 218.0 8.583 19.140 0.754 25.382 0.831 -1193 2.023 The JML Universal Tonearm Alignment Protractor is basi- 219.0 8.622 19.044 0.750 25.258 0.827 -1.187 2.012 220.0 8.661 18.949 0.746 25.135 0.822 -1.180 2.000 cally a coated -cardboard template with null radii optimized 221.0 8.701 18.856 0.742 25.013 0.817 -1.174 1.989 for a record surface within the radii of 2.375 and 5.75 inches. 8.740 18.763 0.739 24.893 0.813 -1.167 1.978 222.0 are $3.00. is 223.0 8.780 18.671 0.735 24.774 0.809 -1.161 1.967 The template and instructions available for It 224.0 8.819 18.580 0.731 24.656 0.804 -1.155 1.956 much better than attempting to construct one as is shown in 18.490 0.728 24.539 0.800 -1.149 1.946 225.0 8.858 Fig. 2. The instructions, though adequate, could have been 226.0 8.898 18.401 0.724 24.423 0.795 -1.143 1.935 227.0 8.937 18.313 0.721 24.309 0.791 -1.137 1.925 more detailed. The JML Company assumes that the consumer 228.0 8.976 18.225 0.718 24.195 0.787 -1.131 1.914 will drill the mounting hole and requires the tonearm effec- 229.0 9.016 18.139 0.714 24.083 0.783 -1.125 1.904 230.0 9.055 18.053 0.711 23.971 0.779 -1.119 1.894 tive length to be measured with a cartridge already mounted. 231.0 9.094 17.969 0.707 23.861 0.775 -1.113 1.884 This is a difficult procedure, but the instructions say that only 232.0 9.134 17.885 0.704 23.752 0.771 -1.107 1.874 is is 233.0 9.173 17.801 0.701 23.644 0.767 -1.102 1.864 approximation necessary. It much safer to use the manu- 234.0 9.213 17.719 0.698 23.537 0.763 -1.096 1.855 facturer's specification for effective length and calculate the 235.0 9.252 17.638 0.694 23.431 0.759 -1.091 1.845 optimum overhang and tonearm mounting center from 236.0 9.291 17.557 0.691 23.325 0.755 -1.085 1.836 237.0 9.331 17.477 0.688 23.221 0.751 -1.080 1.827 equation 3 once the offset angle is calculated from equation 238.0 9.370 17.398 0.685 23.118 0.748 -1.075 1.817 2. Table V presents the optimum overhang and offset angle 239.0 9.409 17.319 0.682 23.016 0.744 -1.069 1.808 240.0 9.449 17.241 0.679 22.914 0.740 -1.064 1.799 for varying effective arm lengths. Note that the mounting 241.0 9.488 17.164 0.676 22.814 0.737 -1.059 1.790 center is the effective length minus the overhang. Small inac- 242.0 9.528 17.088 0.673 22.714 0.733 -1.054 1.782 243.0 9.567 17.012 0.670 22.616 0.729 -1.049 1.773 curacies are taken care of using the null radius system. 244.0 9.606 16.937 0.667 22.518 0.726 -1.044 1.764 Geometrically speaking, if the cartridge nulls at both radii of 1.756 245.0 9.646 16.863 0.664 22.421 0.722 -1.039 the JML template, the overhang and offset angle will auto- 246.0 9.685 16.790 0.661 22.325 0.719 -1.034 1.747 247.0 9.724 16.717 0.658 22.230 0.715 -1.029 1.739 matically be correct. If the tonearm has already been mount- 248.0 9.764 16.644 0.655 22.135 0.712 -1.024 1.731 ed and its measured dimensions are not too far off, the null- 249.0 9.803 16.573 0.652 22.042 0.709 -1.020 1.722 250.0 9.843 16.502 0.650 21.949 0.705 -1.015 1.714 ing system can be used. The procedure can be frustrating, but patience will get accurate results. One point which may values for arms tracking within This table gives optimal not be immediately obvious: The protractor (template) must 60.325 mm and 146.05 mm (2.375 in. and 5.75 in.) inner and be rotated to a different position for zero alignment error at last represent the actual outer grooves. The three columns each null radius. the null radii, angular error for the inner groove, between A more elaborate version of the JML protractor is the DB and the outer groove. This table can be used for determining Systems DBT-10 Phono Alignment Protractor. This unit is the tonearm mounting the mounting position for drilling made of mylar and uses the same nulling system as the JML. board. AUDIO January 1980 TO BUILD A BETTER RECEIVER, WE LEFT OUT A FEW UNNECESSARY PARTS.

What you see here is a former with twin 10,000 µ F sophistication in high fidelity capacitors that virtually design that's never been eliminate noise and hum. achieved in a stereo receiver. Precisely what you The new Toshiba SA 850. look for in a preamp section. Look for conventional tuning the nextlistenable station. Also, 6 We give you provisions for devices, like a tuning knob, or an FM and 6 AM stations can be pre-set. attaching two tape decks. And full FM/AM band, or signal strength and for instant recall tuning at the touch monitoring controls, plus duplica- center tuning meters. of a memory button. The quartz tion switching between the decks. You won't find any. digital synthesizer locks into each Our special subsonic filter The reason is Toshiba's station's assigned frequency with ab- switch eliminates rumble and other unique digital -synthesized tuning. solutely no possibility of drift. You get low frequency noise. The most advanced and precise FM synthesizer accuracy of 0.0025%! A great -looking body and price. system of tuning available today. FM stereo S/N ratio is 68 dB. Rvi our sleek, slide -away Toshiba was the first to de- selectivity is a high 80 dB. Frequency re- Behind cover is a full range of controls, in- velop digital synthesizer circuits in a sponse is 20to 15,0001-íz,+0.2-0.8 dB. receiver, and now we've utilized cluding tone / defeat switch and a If power is what you want, them again. dual speaker selector. Choose ekher then power is what you'll get. The entire unit has a clean, automatic or manual tuning. Full complementary direct - sophisticated look. So you can in- Consider ordinary tuning coupled power amplifiers provide dulge your eyes as well as your ears. systems obsolete. The Toshiba SA 50 watts rms per channel into 8 But we've saved the best part 850allows you to tune automatically ohms from 20 -20,000 Hz. And for last. This digital -synthesized or manually with the ease of push- with a THD of only 0.03%. A figure receiver actually costs only $519.95* button selection. that receivers many times more less than you'd pay for a digital -

You get LED digita . read-out. powerful can't match. synthesized tuner alone. And 5 LED signal strength indicators. This is achieved by low distor- Now, that's the part we In the automatic FM mode, tion differential amplifier technology thought you'd like us to leave in. the tuner will scan until it stops at and a triple secondary power trans- TOSHIBA Again, the first. Toshiba America, Inc. 280 Park Ave.. New York. NY 10017

J,, ,,,,, R ,%I4 9ú l 100 ,.,,, ,,,,, I 1( 00000 l.,, Ö ...... 1661, !1h

Enter No. 50 on Reader Service Card *Suggested Retail Value Solely For Purpose of Information. Key Output above -mentioned alignment tools are available from JML Step 1, 2.375 2.375 Co., 39,000 Highway 128, Cloverdale, Calif. 95425; DB Sys- Step 2 2.38 tems, P.O. Box 187, Step 3 5.75 5.75 Jaffrey Center, N. H. 03454, and Den- Step 4 Divide 8.13 nesen, P.O. Box 51, Beverly, Mass. 01915. Step 5 2 2.00 Step 6 4.06 Step 7 Sq uare 16.50 Calculator Hints Step 8 Divide 16.50 With the advent of inexpensive Step 9 2.375 2.375 yet sophisticated scientific Step 10 Divide 6.95 calculators, solution of the equations presented in this paper Step 11 5.75 5.75 becomes a practical consideration for interested audiophiles Step 12 1.21 as as Step 13 1 1.00 well engineers. Those who have programmable scientif- Step 14 2.21 ic calculators such as the Hewlett-Packard 67/97 can find Step 15 9 9.00 Step 16 19.88 quick repetitive answers easily, thus this section is not really Step 17 St ore Memory 19.88 aimed at them because the capability of programming al- Step 18 2.375 2.375 ready qualifies them to work with algebraic Step 19 2.38 equations. Step 20 5.75 5.75 It is assumed that for practical purposes, the calculator has Step 21 Divide 8.13 trigonometric and standard algebraic functions, one memory, Step 22 Recall Memory 19.88 Step 23 0.41 and no algebraic hierarchy except single argument functions Step 24 Arc Sine 24.13 degrees offset angle such as square root. For example, the very inexpensive Texas Instruments TI -30 would be a good choice. Users with more sophisticated equipment Table VI - Calculator steps for calculation of can modify the procedure. The cal- optimum offset angle. culator mode, for simplicity, will be fixed at two decimal places. A good set of instructions comes with the $19.95 unit, which Equations 2 and 4 are of the most interest since they calcu- also allows the user to measure tracking angle error. late offset angle and overhang. There is only one rotated position of the protractor that Example 1: Solve the following equation for offset angle: will be correct for any one arm of given effective length. If this position could be fixed, nulling would 2.375+5.75 7 only have to take r [/2.375+5.751' place at one radius and could be performed in one step. The Arc sin Dennesen Geometric Soundtracktor has recently 9x 2 J + 1J been intro- 2.375x5.75 duced to perform this function. Available in two models -a plastic version for $35.00 and a metal version for $100.00- Refer to Table 6 for the step-by-step procedure. the user can, in a single step, align overhang, offset angle, Example 2: Solve the following equation for mounting cen- and both null radii, provided the tonearm has an obviously ter: 88 marked pivot center. We have used this tool for the past few J92+2.6=-2x9x2.6xcos months and recommend it without reservation. The instruc- (90-24.13) tions are simple, with the actual procedure not taking more Refer to Table 7 for the step-by-step procedure. than a few minutes. The Soundtracktor will quickly indicate if the tonearm is optimally set up and will make realignment The procedures are general and may not be directly appli- of the cartridge an easy job. The Dennesen Soundtracktor is cable to all calculators. Since the output column gives the accompanied by a vertical tracking angle (VTA) reference intermediate results, one can modify the routines for his own gauge, which looks like a tonearm rest post and a bubble calculator. Q level for the tonearm. Although the unit does not determine VTA, it does establish the reference number for each record in a collection, where the sound is most focused. Once the VTA is established for a record, it is a simple matter to set the References tonearm to the correct VTA number, 1. established earlier. The Baerwald, H. G., "Analytic Treatment of Tracking Error and Notes on Pick - Up Design," J. Soc. Mot. Pic. Engrs., 37:591, Dec., 1941. Table VII -Calculator steps for calculation of mount- 2. Bauer, B. B., "Tracking Angle in Phonograph Pickups," Electronics, p. 2, Mar. ing center and stylus overhang. 1945. 3. Consumer Reports, 21:245, May, 1956. Key Output 4. Seagrave, John D.: "Minimizing Pickup Tracking Error, Part I," Audiocraft Step 1 90 90.00 Magazine, 1:19, Dec., 1956. Step 2 90.00 5. Seagrave, John D., "Minimizing Pickup Tracking Error, Part 1l," Audiocraft Step 3 24.13 24.13 Magazine, 2:25, Jan., 1957. Step 4 65.87 Step 5 Cosine 0.41 6. Seagrave, John D., "Minimizing Pickup Tracking Distortion, A Sequel," Au- Step 6 0.41 diocraft Magazine, 2:22, Aug., 1957. Step 7 2.6 2.60 7. Hiscocks, Peter; 'Tonearms,"Audioscene Canada, Nov., 1975, p. 64. Step 8 1.06 8. Kogen, James Step 9 9 9.00 H., "Record Changers, Turntables, and Tone Arms -A Brief Step 10 9.57 Technical History," Jour. Audio Eng. Soc., 25:749, Oct./Nov., 1977. Step 11 2 2.00 9. Bauer, B. B., "The High -Fidelity Phonograph Tranducer," Jour. Audio Eng. Step 12 19.13 Soc., 25:729, Oct./Nov., 1977. Step 13 St ore Memory 19.13 Step 14 9 9.00 10. "Have Tone Arm Designers Forgotten Their High -School Geometry?" The Step 15 Square 81.00 Audio Critic, 1:31, Jan./Feb., 1977. Step 16 81.00 11. "Cartridge/Arm/Turntable Followup: Loose Ends Step 17 2.6 2.60 and New Develop- ments," The Step 18 Square 6.76 Audio Critic, 1:43, Spring/Fall, 1978. Step 19 87.76 12. Nuti, Paolo, "Le Caratteristiche Geometriche dei Bracci in Rapporto all' Step 20 Recall Memory 19.13 Errore Radiale di Tangenza," I.A.F.2, Sept., 1977 - Supplemento al n. 63 di Step 21 68.63 Suono. Step 22 Square Root 8.28 in. spindle center to tonearm pivot 13. S. Step 23 9 9 Takahashi, S. Taguchi, N. Kaneko, and Y. Fujimoto, "The Optimum Pivot Step 24 9.00 Position on Tonearm," A.E.S. Preprint 1390 (D-5) presented at the 61st Con- Step 25 8.2- 8 8.28 vention, Nov. 3-6, 1978, New York. Step 26 0.72 Stylus tip overhang 14. Stevenson, J.K., "Pickup Arm Design," Wireless World, May & June, 1966.

AUDIO January 1980 BOOK STORE Your Best Source to Build a Worthwhile Library

No. 752-Design, Build & Test Speaker No. 516-Understanding Electronics. All No. 792-How To Design á Build Systems. Do it yourself guide shows about electronic circuits-what they are, Electronic Instrumentation. Ready to beginner and expert how to get the most how to build them, what they do. 4.95 use, practical circuits for hobbyists, from a technicians, hams and engineers. 9.95 speaker. 6.95 No. 517-The Power Supply Handbook. No. 751-Microphones. Complete A broad and varied collection of ready to No. 796-TV Antennas and Signal manual shows how to record-anything. build power sources for electronics Distribution Systems. An invaluable aid Special section tells how to interpret hobbyists and engineers. 7.95 to help you select and install TV antenna spec sheets. 5.95 and signal distribution systems. 9.95 No. 518-Grounding and Shielding No. 759-Audio IC OP -AMP Techniques in Instrumentation, 2nd Ed. No. 794-Select and Install Your Own Applications. Newly revised 2nd edition All you need to know about grounding Speakers. From autos to auditorium, includes many new high performance and shielding electronic equipment.17.50 here's how to get the best reproduction circuits. 7.95 from any audio system. 5.95 No. 519-Noise Reduction Techniques No. 520-1001 MORE Practical in Electronic Systems. Topics include: No. 793-Master Handbook of 1001 Electronic Circuits. A comprehensive shielding and grounding, protection of Practical Electronic Circuits. A collection collection of 1001 more integrated circuit switching contracts, passive and active of 1001 circuits and the peripheral & transistor circuits, with the data device noise sources, much more. 25.50 information needed to put the circuits to needed to put them to work. 12.95 work. 12.95 No. 447-Hi-Fl Stereo Handbook. Complete coverage of Audio Systems from Source to Sound. All the differences of monophonic, stereophonic and four channel sound explained and much more. 11.95

A180 752 DESIGN, BUILD & TEST SPEAKER SYSTEMS 6.95 Please send me the book(s) I have checked. 751 MICROPHONES 5.95 is my proper remittance for $ 759 AUDIO IC OP -AMP APPLICATIONS 7.95 Enclosed 1001 MORE PRACTICAL ELECTRONIC CIRCUITS 520 12.95 I understand if I am not fully satisfied I may return my 516 UNDERSTANDING ELECTRONICS 4.95 selection(s) in undamaged condition within 10 days for a 517 THE POWER SUPPLY HANDBOOK 7.95 full refund. 518 GROUNDING AND SHIELDING TECHNIQUES 17.50 519 NOISE REDUCTION TECHNIQUES IN ELECTRONIC Name (please print) _ SYSTEMS 25.50 447 HI-FI STEREO HANDBOOK. 11.95 Address 792 HOW TO DESIGN & BUILD ELECTRONIC INSTRUMENTATION 9.95 City/State/Zip__ 796 TV ANTENNAS AND SIGNAL DISTRIBUTION SYSTEMS 9.95 794 SELECT AND INSTALL YOUR OWN SPEAKERS 5.95 Please allow 4-6 weeks for delivery. E 793 MASTER HANDBOOK OF 1001 PRACTICAL ELECTRONIC CIRCUITS 12.95 YOU MAY PAY FOR YOUR BOOK(S) ON YOUR CREDIT CARD CREDIT CARD NO Book and Learning Systems Division VISA AMERICAN EXPRESS DINERS CLUB American North American Publishing Company, North Building, MASTER CHARGE M/C BANK NO. 401 N. Broad Street, Philadelphia, PA 19108 NUMBER MUST APPEAR MAMte_ IF USING MASTER CHARGE "e:-A EXP. DATE

'h' 5 C Audio Magazine is published by North American Publishing Company, leaders in editorial excellence. Mitsubishi Micros Equipment Model M -F01 Tuner Model M-PO1 Preamp Model M -A01 Amplifier profiles

Manufacturer's Specifications

M -F01 Stereo FM Tuner Usable Sensitivity: Mono, 11.2 dBf (2.0 pV); stereo, 22.7 dBf (7.5 pV). 50 -dB Quieting: Mono, 19.2 dBf (5.0 p V); stereo, 39.2 dBf (50 pV). S/N: Mono, 80 dB; stereo, 77 dB. Frequency Response: 30 Hz to 16 kHz, ±1 dB. THD: Mono, 0.08 percent; stereo, 0.1 percent; both for 65 dBf, 1 kHz. Capture Ratio: 1.0 dB. Selectivity: 70 dB. 1.f., Image and Spurious Rejection: 100 dB. AM Suppression: 65 dB. Stereo Separation: 1 kHz, 50 dB; 10 kHz, 40 dB. Subcarrier Rejection: 70 dB. SCA Rejection: 80 dB. Dimensions: 105/s in. (27 cm) W x 23/4 in. (7 cm) H x 93/4 in. (24.75 cm) D.

Weight: 7 lbs. (3.18 kg) . Price: $340.00. M-PO1 Stereo Preamplifier Input Sensitivity: MM phono, 2.3 mV; MC phono, 0.1 mV; high level, 150 mV; all for 1 V rated output. Maximum Output: 18 V. S/N: MM phono, 84 dB; MC phono, 77 dB; high level, 110 dB; all "A" weighted, referred to rated output. Phono Overload: MM phono, 290 mV; MC phono, 12 mV. THD: MM phono, 0.003 percent; MC phono, 0.005 percent; high level, 0.002 percent; all at rated output with master volume control at -20 dB. Frequency Response: MM or MC phono, RIAA ±0.2 dB, 20 Hz to 20 kHz; high level, 10 Hz to 100 kHz, ±0.5 dB. Bass Control Range: Up to +8 dB at 100 Hz. Treble Control Range: Up to ±8 dB at 10 kHz. Subsonic Filter. 18 Hz, -6 dB/octave. Dimensions: 10% in. (27 cm) W x 23/4 in. (7 cm) H x 93/4 in. (24.75 cm) D. Weight: 7 lbs. (3.18 kg). Price: $370.00. 91

M -A01 Stereo Power Amplifier Power Output: 70 watts/channel, 8 - ohm loads, 15 Hz to 20 kHz, 0.01 percent THD (85 watts/channel, 4 ohms, 0.02 percent THD). IM Distortion: 0.008 percent. Frequency Response: D.c. to 200 kHz, -1 dB. JI1113 Input Sensitivity: 1 V. Damping Factor. 100, 20 Hz to 20 kHz. S/N at Rated Output: 109 dB, AIN JIM unweighted; 123 "A" weighted. Slew Rate: 30 V/ pS. Dimensions: 10% in. (27 cm) W x 6-11/ AININ 16 in. (17 cm) H x 9-9/16 in. (24.25 jaw

cm) D. 111111111 Weight: 22 lbs. (10 kg). Price: $500.00.

AUDIO January 1980 MICROVOLTS,ACROSS 300 -OHM ANTENNA TERMINALS

17.4 55.0 174,0 550 978 1740 5500 0 1 The Tuner 1 The M -F01 has an elegantly styled front panel which bears 1 10.0 -20 C only a single rotary tuning knob at its extreme right. Three 1 1 small push buttons just to the left select a record -level check 1 N MONO THD0.067% 1 A red LED 40 1.0 tone, FM muting, and mono or auto -stereo. near panel -center illuminates in the presence of a stereo signal, '\ STEREO THD 0.1% z while further to the left are three LEDs (two red arrows flank- -60 0.1 ing a green square) which together serve as a center -tuning 4 I _ indicator. When you are slightly detuned, one of the arrow `STEREO S/N 72Á8 -80 MONO S/N 80dß 0.01 LEDs tells you which way to tune to achieve proper tuning. 0 10 20 30 40 50 60 65 Once that is accomplished, the red arrows extinguish, the

SIGNAL INPUT POWER- dBf (0 dBf 1 9 10- 5 WATTS) green light comes on and, as further insurance that you may now sit back and listen secure in the knowledge that you are at the minimum distortion point, the entire frequency scale Fig. 1 - Mono and stereo quieting and distortion characteristics, FM section, M -F01 tuner. changes the color of its illumination from white to a soft green. There are five more LEDs at the left which serve as a signal -strength metering system with the number of LEDs lit The three Mitsubishi products tested for this report are the indicating the relative strength of the incoming signal. A first mini- or micro -components to pass through our labora- small power On/Off button is located at the lower left of tory, and one thing became clear immediately: They are defi- the panel. nitely meant to work with each other, both aesthetically and The rear panel is equipped with terminals for 75 -ohm and practically. Accordingly, we are treating this investigation as 300 -ohm antenna transmission lines and a ground terminal. one overall test report, much as we would in the case of an There are also two pairs of output jacks, one providing fixed integrated receiver, which in fact these three units replace. voltage, the other providing variable output, adjusted by Before dealing with the individual separate components, means of an adjacent potentiometer. There are also a pair of which consist of an FM tuner (M-FO1), a preamp-control multipath output jacks which can be connected to a 'scope unit (M -P01), and a stereo power amplifier (M-AO1), let's for visual multipath indication or may be connected to the consider the matter of space -saving which is said to be one AUX inputs of the associated equipment for audible evi- of the major advantages of mini- or micro -components. To dence of this effect. Two unswitched a.c. receptacles are also begin with, Mitsubishi does suggest not stacking all three incorporated on the rear panel. components one above the other because of ventilation con- While no circuit diagrams were supplied with these three siderations. Assuming, then, that we stack the tuner and components, we did remove their top covers in order to 92 preamp one above the other, their combined height will determine just how crowded the insides were. In the case of nicely match the height of the power amplifier which, as the M -F01, at least, the internal layout was not overly com- Mitsubishi suggests, should be positioned at least two inches pressed and access for possible servicing was good. The to the side of the other pair of units. Following these instruc- shielded front end used in the tuner was mounted directly to tions, we come up with a horizontal and vertical space re- the main tuner p.c. board, in a manner not unlike that found quirement of about 2314 by 6-11/16 inches. There are few all - in more standard -sized components. in -one integrated receivers which have front panels that are as large! However, because the depth of the units (93/4 in. FM Performance Measurements maximum) is considerably less than that of most receivers, While usable sensitivity in mono fell a bit short of claims the signified space -saving comes in shelf depth, so that the (13.2 dBf instead of 11.2 dBf), 50 -dB quieting was reached trio will fit easily into the depth of a standard bookcase. And, with signal levels of 19.2 dBf (5.0 NV) exactly as claimed. Ster- of course, we are dealing with separates, with all their advan- eo usable sensitivity was considerably better than specified, tages of flexibility, and the fact that you aren't obligated to with a reading of 18 dBf (3.7 NV), while 50 -dB quieting for purchase the tuner, for example, if all you want are record stereo measured 40 dBf, virtually as claimed, quite usable, and tape -playing facilities. If you do decide on all three com- rather poorer than for other tuners in this price category. ponents (and there's no denying that they look just great but ratio in mono was a very high 80 db, as together and are sure to become conversation pieces), do Signal-to-noise stated, while in stereo the S/N was a very acceptable 72 dB. bear in mind that their combined suggested retail price All of the various rejection figures quoted by Mitsubishi comes to over $1,200.00. With all of this in mind, let's go on i.f., spurious) were met or exceeded, and capture to the components themselves. (image, and ratio measured 1.0 dB, as claimed. AM suppression was 63 dB as opposed to 65 dB specified. Quieting and THD (at 1 kHz) Fig. 2 - Mono and stereo THD vs. frequency, M -F01 characteristics of the tuner versus input signal are shown in tuner. Fig. 1, while Fig. 2 is a graph of distortion versus frequency in at the three test frequencies of 0 40 mono and stereo. Distortion ..111.111..111::::::.:::::::::::: -MONO::::i11I 1kHz, 100 Hz, and 6 kHz measured 0.067 percent, 0.13 per- oauouuomoou.1111.u111..111.111 cent, and 0.13 percent for mono and 0.1 percent, 0.16 per- IMM11111111M1111111111M1111111rn1111MI1111II cent, and 0.17 percent for stereo, all exceedingly good fig- .1111111Si11111...1111111M111110iM11111111I z ures, especially the 6 -kHz result in stereo. Frequency re- o sponse and stereo FM separation are shown in the spectrum Ñ 0 60 rr Fig. 3. A slight dip in response in the o MIIIMIM.11111B.lhoJM.11111M111M::::IM::'-::IZi::::::::::: analyzer 'scope photo of 111 . . 1 . 111 . . 11 region between 3 kHz and 8 kHz seems to be compensated ouuou.oumMIIIIMIZfi11111111111I111MMRO11I1M11111111111I1 for by the slight rise at the extreme high end resulting from . 19 notch filter employed so that, 111111111111111111111111 the termination of the -kHz overall, response out to 15 kHz was virtually flat (though it 0.01 80 100 I9 l0k 209 was about 1.0 dB at the upper midrange). At the three 1011U1U1 off by FREQUENCY - Hz test points of 100 Hz, 1 kHz, and 10 kHz, stereo separation AUDIO January 1980 The logic behind the Revox B77. The logic is the logic which is built-in. long -life advantage of ferrite without static build-up or heat degradation, we use Revox's exclusive Revodur It's an ingenious and highly sophisticated system- heads, made of metal to dispel heat and static, and much like the human nervous system-which controls vacuum -coated with permalloy for durability. the deek°s functions. The B77 has a unique capstan motor that's monitored by You can push any button in any order with no chance of a tacho head to precisely control speed and limit wow damaging your tapes. Our motion sensing system con- and flutter to professional studio standards. stantly feeds status reports to the logic circuitry which activates your commands in proper sequence. Revox offers many options with the B77 including a full range of speed configurations from 15/16 IPS to 15 IPS, The logic also permits full -function remote con- variable speed control, l,4 track record/playback and more. trol, and an editing mode that keeps the playback circuitry hve, even when the motors are stopped. You can All this professional quality is neatly engineered make your splices right on -the -beat, and our built-in to fit in a deck you can carry. After all, if you own a splicing block makes it easy. machine this good, it's logical to take it with you. The design and construction of the Revox B77 further Experience the B77 and the full line of Revox audio guarantee smooth and accurate operation. lb get the components at your franchised Revox dealer today.

REVOX?n-erica, Inc. 18t Br( ad ay, Nas 1.11e, r'N 37203 615 329-9576/ la Canada: Studer Revox Canada, Ltd. Enter No. 45 on Reader Service Card Fig. 3 - Frequency Fig. 4 - Crosstalk response and stereo components at 5 kHz, separation, stereo mode, M -F01 tuner. M -F01 tuner.

measured 47 dB, 51 dB, and 33 dB, the latter figure short of Somehow, the designers managed to incorporate all the the 40 dB claimed. needed input and output jacks on the rear panel of the M - Figure 4 is a composite spectrum analyzer photo, illustrat- P01, and still had room for three convenience a.c. outlets ing the crosstalk component generated when a 5 -kHz signal (two switched, one unswitched) and a turntable ground ter- is used to modulate the left channel (tall spike at left), and a minal, which is located adjacent to the phono input jacks. second sweep of the analyzer is made with the output of the There are no input level controls for any of the preamp in- right channel connected. Sweep is linear (5 kHz per horizon- puts (there would hardly be any room for them in any case), tal division) and, in addition to distortion components which but this poses no real problem if a user assembles all three are multiples of the 5 -kHz modulating signal, we see a rather Mitsubishi components, since the tuner is equipped with an large 38 -kHz spike to the right of mid -screen, as well as one output level control which can be set so that equal loudness at 48 kHz (38 kHz plus the second harmonic of 5 kHz) further is obtained when switching from radio to phono. to the right. The sub -carrier product ratio falls short of the -70 dB claimed by the manufacturer, at least in this sample, and Preamp Performance Measurements the components at 10 kHz and 15 kHz in the unmodulated RIAA equalization for both the MC and the MM phono channel are large enough to suggest that, under certain con- circuits was so close to perfect from 20 Hz to 20 kHz that we ditions, this unwanted material would be audible from the could not even assign a "plus or minus dB" tolerance to this speaker that is supposed to be silent when high -frequency measurement. Suffice it to say that our own inverse RIAA information is modulating one channel only. This condition, signal generation equipment is accurate to within 0.05 dB, 94 often described as "poor separation," is in reality a form of and as we switched from frequency to frequency, the output spurious crosstalk totally unrelated to the tuner's separation meter needle just remained stationary. Response via the high capability. level inputs was flat within 1.0 dB from 4 Hz to 47 kHz. The Since our listening tests were conducted with the three- subsonic filter, operative in all program modes, had a -3 dB piece system as a whole, we will go on to describe the other cutoff point of 17 Hz and a slope of 6 dB per octave. Input two components and to detail the measurements made be- sensitivity (based upon the new IHF standards) measured fore discussing the sound quality of all three. 1.22 mV for the MM inputs (for 0.5 volts out), 0.07 mV for the MC phono inputs, and 75 mV for the high level inputs. S/N The Preamplifier for the MM inputs (referred to 5 mV input, 0.5 volts output) The control layout of the M -P01 preamplifier/control unit measured 76 dB, "A" weighted, while for the MC inputs it is similar to that of the tuner, in that only a single large rotary measured 66 dB (referred to 0.5 mV in and 0.5 volts out). knob is found on the front panel, positioned just where the Phono overload was extremely high, 300 mV via the MM tuning knob is on the tuner. This control, however, is in reali- inputs, 12.2 mV via the MC inputs. ty a dual control (with concentric outer and inner knobs) and Harmonic distortion via all the inputs was virtually serves as a master volume control for each channel inde- unmeasurable, with readings of around 0.0025 percent ob- pendently. This obviates the need for a separate balance contained for the high level inputs and approximately 0.003 per- trol. All other control functions are activated by means of cent for the phono inputs at any frequency from 20 Hz to 20 small push buttons, many of which have LED indicators kHz, for a 1.0 volt (rated) output. THD was almost impossible mounted above them. to determine with any degree of accuracy for the MC inputs The M -P01 employs a novel and, in our opinion, desirable because it was well below the noise floor, indicating a distor- tone -control arrangement. Instead of rotary knobs, there are tion level of well below 0.01 percent from input to main two series of tiny buttons (one group for bass, another for output. treble). Four buttons in each group select fixed amounts of The very precise action of the bass and treble controls (or, boost or cut (2 dB, 4 dB, 6 dB, or 8 dB) at 100 Hz or 10 kHz, rather, the bass and treble multiple push buttons) is depicted while the fifth button determines whether that amount shall in its entirety in the multiple -sweep spectrum analyzer photo be boost or cut (+ or -). LEDs above these buttons tell the of Fig. 5. The nice thing about this arrangement is its abso- user what degree of boost or cut has been selected, and there lutely perfect resettability, though of course, rotary controls is also another button among each group of LEDs which per- having step-detent positions can also be easily reset to pre- mits you to bypass the tone controls entirely. When this but- ferred amounts of boost or cut. ton is depressed, it becomes illuminated as well. Function selector buttons are located between the master The Power Amplifier volume knobs and the tone buttons, and include AUX, tuner, The Model M -A01 is, as you might expect, the largest and MM phono, and MC phono. There is also a mono/stereo heaviest of the three components which make up this Mitsu- switch in this area of the panel, a subsonic filter button, two bishi system, though it is small and light compared with most tape monitor buttons, and a pair of tape dubbing switches. standard amplifiers having similar power -output ratings. The The power On/Off switch is at the lower left of the panel, as upper half of the amp's front panel matches the other com- in the case of the tuner. ponents in appearance, with the lower half of the taller com- AUDIO *January 1980 YOUR TURNTABLE PROBABLY REDUCING EFFECTIVE TIP MASS, DESERVES BANG & OLUFSEN. BANG & OLUFSEN'S If you've spent a fair amount of time and money on your ENGINEERING TRADITION. audio system, it's likely your turntable is ready for the new As early as 1958, our research demonstrated that MMC 20CL cartridge. You do need a tonearm which can track successfully at one gram, one that has its own effective tip mass (ETM) was the single most determining factor record resonance well damped, and one which features minimal behind wear and the horizontal and vertical friction. Many of today's higher loss of high frequency sound information. While some manufacturers are now beginning to realize quality units meet these criteria; more likely than not so does the one you own. the importance of this specification, only Bang & Olufsen can look back upon a continuous chain of improvements in this critical area. Today, the THE MMC 20 CL, A REFRESHING MMC 20CL with its Contact Line, nude diamond, ultra -rigid sapphire cantilever, and PERSPECTIVE IN CARTRIDGE DESIGN. the patented Moving Micro Cross armature Critical acclaim has identified the MMC 20CL as an features an ETM value of only 0.3mg. exceptional cartridge. It is. It will not only give you more music from your records, but will insure those records last significantly longer. However, it is LOW INDUCTANCE, not one of those 'astounding OUTPUT REMAINS CONSTANT breakthroughs' that always seem to be hovering around cartridge design and its REGARDLESS OF LOAD. promotion. No, while the 20CL does As you know, low inductance in a cartridge is incorporate new thinking, new materials, related directly to the strength and constancy and new manufacturing methods, it should be reasonably viewed just of the electrical signal fed to your as it is: simply one step closer to the theoretical ideal. When we preamplifier input. What you may not know introduced the first stereo cartridge to Europe over 20 years ago, we is that the MMC 20CL knew that someday we would have the 20CL. Our approach to has an inductance cartridge engineering tells us that 20 years from now we will have among the lowest of something significantly better. all high quality cartridges available today. This is due to SINGLE CRYSTAL SAPPHIRE, a design which incorporates an BECAUSE THE CANTILEVER IS CRITICAL. e. exceptionally powerful permanent magnet Unlike aluminum and beryllium, single crystal sapphire and coil cores of very low permeability. transfers the motion of the stylus tip without adding This design results in very low cartridge any measurable vibration, and hence distortion, of its 77,4%) induced noise. Subsequently you receive own. The absence of this vibration and flexure in the an excellent signal-to-noise ratio without cantilever means the undulations in the record being required to use auxiliary equipment. groove are transferred exactly and generate an exceptionally accurate electrical signal. INDIVIDUALLY Music is no longer lost between the stylus tip and the armature. Your records open CALIBRATED. up and music unfolds with new clarity, When you manufacture very high quality definition, and spaciousness. cartridges, each unit must be tested-not one out of two, or ten, or twenty, but each one. This is why when you purchase the MMC 20CL, you will receive the test results for your individual cartridge. These results include: output voltage, channel balance, channel separation, tracking ability, and a frequency response graph for each channel.

Give your turntable what it deserves. The MMC 20CL with our new universal connector can be mounted directly on most high quality tonearms. THIS TIME MAKE THE RIGHT CONNECTION

Bang&Olufsen For Information Write To: Audry Athearn

Bang & Olufsen of America, Inc., 515 Busse Road, Elk Grove Village, Illinois 60007 Enter No. 11 on Reader Service Card Fig. 5 - Bass and of all IM components produced during the two-tone test) treble control range, was nearly as low, with a_ reading of 0.31 percent. Figure 6 M -P01, preamplifier. includes graphic plots of THD and IM distortion versus power output for 8 -ohm loads (with a 1 -kHz test signal), as well as a graph of THD versus power output for 4-ohm loads where rated distortion (0.02 percent) was reached with an output level of 106 watts, well above the 85 watts claimed. Figure 7 shows plots of THD versus frequency for rated output power levels (70 watts for 8 -ohm loads, 85 watts for 4 - ohm loads). At all but the frequency extremes, THD was so low as to be largely influenced by the residual distortion present in our test signal (under 0.002 percent). In trying to measure IHF dynamic headroom, we found ponent devoted to heat -sink ribs which keep the amplifier that the required test signal (a tone burst of 20 cycles worth running reasonably cool. A power switch at the upper left of 1 -kHz signal followed by the same frequency diminished turns the unit on, and below it is an indicator light to show in amplitude by 20 dB) caused the amplifier to shut down as that power is applied. Two banks of LED power -output indi- we tried to increase burst level to the observed clipping cators are spread across the upper section of the panel and point. This is the first time that this has happened with any are basically calibrated to read from 0.025 to 100 watts (re- power amplifier we have measured since the dynamic head- ferred to an 8 -ohm load). One of the three remaining push room measurement was defined in the new IHF standards. buttons at the upper right changes sensitivity of these dis- Apparently, the designers of this small amplifier must have plays to read from 0.0025 to 10 watts so that the display re- been concerned about its size and thermal condition, al- mains useful when listening at low to moderate loudness though we must say that during subsequent listening tests levels. The two remaining buttons are for speaker selection, (conducted at levels up to and exceeding the clipping point) and while both may be depressed simultaneously, the com- we experienced no such shut -down. We cannot, however, bined speaker impedance under those circumstances should report the dynamic headroom figure under the circum- not be less than 4 ohms. A stereo headphone jack is located stances. just under the upper half of the front panel, nestled in the Slew rate, measured visually on our 'scope using a 20-kHz rib -like heat -sink structure referred to earlier. step function, turned out to be exactly 30 volts per micro- rear panel has The of the M -A01 the usual pair of input second, as claimed. Signal-to-noise ratio, referred to 1 -watt jacks and eight color -coded speaker terminals for easy con- output, measured 90 dB ("A" weighted). Translated to rated nection of the speaker cable ends. There are no convenience output (the reference used by Mitsubishi) that would be just a.c. outlets on the power amp since the user would typically over 108 dB. Input sensitivity for rated output was exactly 1.0 96 connect its power cord via one of the receptacles on the volt, as claimed. The high output capability (18 volts) of the preamplifier for common turn on or turn off of the entire M-PO1 preamp, with which this amp is likely to be used, three-piece system. means that there should be no problem whatever in terms of driving compatibility between the two components.

Amp Performance Measurements Use and Listening Tests The amplifier produced 81 watts of power at mid -frequen- After completing the measurements on the individual cies into an 8-ohm load before reaching its rated THD of 0.01 components, we arranged them on a shelf in accordance percent. While there was ample power reserve at 20 Hz (76 with the array suggested by Mitsubishi and hooked the amp watts per channel for 0.01 percent THD), the amp delivered outputs up to a pair of medium -efficiency, floor -standing, its exact rated power of 70 watts per channel at 20 kHz for vented -design speaker systems of which we are particularly 0.01 percent THD with no margin. The unit's rated power of fond. 70 watts went all the way down to 12 Hz (as compared with We found the tuner section easy to tune accurately and the 15 -Hz lower power -band limit stated in the specs). At totally free of significant drift even after hours of use. It was rated output (70 watts), with a 1 -kHz test signal, THD mea- reasonably sensitive when hooked up to our outdoor anten- sured a mere 0.0025 percent and SMPTE-IM distortion was na. There was no difficulty with adjacent channel or co -chan- even lower, with readings of 0.002 percent. CCIF distortion nel interference, even in our relatively crowded signal area. (the 1 -kHz "difference" tone produced when two high -fre- (Our measured selectivity was 73 dB as against a claimed 70 quency signals are fed to the amp simultaneously) measured dB; a good choice for a tuner which does not feature select- percent at rated IHF 0.3 output, while IM (the geometric sum able narrow/wide i.f. bandwidth.) Continued on p. 109

Fig. 6-Power output vs. distortion, M -A01 Fig. 7 - Distortion vs. frequency at rated output, amplifier. M -A01 amp ifier. 0.10 -60 0.10 :::=ZZZ::'i 60 iiiiiIMINIZINII...1iiiiii THD IkHx,80HMS ¡¡i fflaBi1ffla1iiiiiiiiiii=Z 70 W/CH,80HMS ii1 MilM1111 IMIM1111 111111111111MI1111 SMPTE-IM,BOHMS MM1111M - 85 W/CH,40HMS 111 ZMIMIMII111111111139.111111MIM 111 IkHz IM21111M1111 11111Ititlti111111ti ---THD 4 OHMS III 1111111111111131111 111111111111111 ó M1111111113111111111111111111111111111111 J IIIII 111111IIIIIIIIIIII IJ > z W 0 0.01 31111111111111111111111111111112111111111 1111IIII.1IIIIIII.1IIIIIIIM11III 80 J ..iiii:;.79.3.óiMiiii1MIIMIiiii iiiIIMIMIiiiiii ¢ MI.e-Vu.1111241inli--11eilialMMINIrn111 111M11UO M2111 iiiiiiiúiiiiiiiIIIINZIII18110111111111MMO1MMO11 o 1151113m/11.'...mei:Plif111.Offlimm1111mm111 iiiiMfflMM111111111111111131111111M113111!IIMM1111 H mimmaiaIulmbilneu\aGmmi.!7m1111mil111 MW' fflM11111MMI111IIIIIIIIIMZOPi1141111MM1111 tn 11111i':!!iZ,í::111!Iti11111 rr1111 rz0E11111fflIM/7/511111131111111111 s 111111111111:?'II II111111 Illiiil111111101i::N0111i@let:i1111M111111

0.001 1111111111111111111IIIIIII1111111111 -100 0.001 11111IIIIII1IIIIIII1111111I1IIIIIII loo 0 1 1.0 10.0 100.0 1000.0 10 100 Ik 10k 20k POWER / CHANNEL (WATTS) FREQUENCY - Hz AUDIO January 1980 .. a well finished system of good performance, ... representing good value for money at its moderate price." 'GRAMOPHONE' Review c f PAGEANT SERIES 2.

the speakers gave a good account of themselves on almost every type of material, an initial favourable impression being confirmed as the length of acquaintance grew. " Mordaunt-S fort are on to a real winner here." 'HI -Fl SOUND Review of PAGEANT SERIES 2.

"The impression of excellence is further enhanced when one looks at the technical test results." .. a well -engineered, well -executed design, where attention has been paid to the end result - the listening experience - with the result that (the PAGEANT SERIES 2) out- performs, by a fair margin, all the other submitted designs in the important area of `listenability'. 'PFIACTICAL HI-FI & AUDIO' Comparative review of 6 loudspeaker models.

"Maintaining :he high standard set on the live listening session, the speaker further improved its ranking relative to the group, assuming the No.1 position under stereo programme testing." "... an unquestionable best buy." undoubtedly an example of consumer engineering at its best." 'HI -Fl FOR PLEASURE' Comparative review of 30 loudspeaker models.

"I not only recommend this speaker very highly, but rate it excellent value for money."

ar us eitg sie,HI-FI LoyofirERSi "' r uite the best name to know.

/ /W- Mordaunt-Short Inc \c`'Q High -Fidelity Loudspeaker Systems / /caFe 1919, Middle Country Road, Centereach, N.Y. 11720. /reaás Telephone: (516) 981-0066

:<` Se g / / a,cceea ..ese Pdates

Enter No. 28 on Reader Service Card Pioneer Model PL -630 Automatic Turntable

Manufacturer's Specifications Wow and Flutter: Less than 0.025 per- Arm: Static -balance, S-shaped type. cent W rms. Usable Cartridge Weight: 4 to 12.5 g. Type: Two speed. Rumble: -75 dB DIN "B." Arm Height Range: ±3 mm. Motor Type: Quartz -reference, phase - Speed Accuracy: ±0.002 percent. Dimensions: 181 in. (46.9 cm) W x 161/2 locked loop, Hall effect, d.c. direct Speed Adjustment Range: ±6 percent. in. (41.9 cm) D x 53/4 in. (14.6 cm) H. drive. Tracking Force Range: 0-3 g. Price: $449.00.

Once upon a time, when there were no automatic features Repeat and Stop functions, as well as the speed selection. in turntables, we used to put a record on the turntable Even the cue lift is actuated by a feather -touch button! No platter, carefully place the phono cartridge stylus in the wonder this unit is described as a "fully automatic turn- groove, and then, at the end of play, lift the arm and return it table!" Naturally, it has a quartz -controlled direct -drive mo- to its rest all by hand! - Well, of course, we often still play tor, but here's a surprise: Instead of a digital readout, speed is our records like that, but in this computerized age it would displayed on a 21/2 -in. meter which is calibrated from -6 to +6 be a little archaic to work out a complex equation with reams percent. of paper and a pencil instead of using a calculator. In some All the controls are located right on the front panel where areas, obviously, automation is quite necessary. One most they are accessible when the dustcover is closed. From left to crucial area is with the modern high -compliance cartridge, right they are as follows: Number one is the On -Off button which is quite fragile and can be easily damaged by the ham- and number two is the Auto -Manual switch. Then comes a handed. Here a cue -lift device is really a "must." group of four push buttons: Three relate to the record sizes The new PL Pioneer -630 turntable takes automation a lot and the fourth is the Repeat button. Next to that is a large further: There are push buttons for three different record siz- Stop button and a two -position switch for speed selection es (when was the last time you saw a 10 -in. record?) and for (yes, it is a push button). The aforementioned pitch meter is

AUDIO January 1980 SOUND CHALLENGES THAT CREATE UNEXPECTED GIFTS

FitOM SOUND BARRIER

Sound Barrier Systems will Launch you into New and Unknown Sound Dimensions.

The Supertiin Challenge: Sound Barrier refusing to employ tt e accepted approach towards superthin door mount speakers, that sacrifice response and tone range for thinness which results in a flat tinny sounc, set out to create a quality dynamic full range superthin speaker.

The Gift: Sound Barrier's two-way Falcon 20 revoluntionizes superthin technology. The non- conformist Falcon 20, challenging conventional design and engineering methods, delivers that "impossiblE" superthin sound. When you listen to a pair of Sound Barrier Falcon 20's you just won't believe tha: they are superthin speakers.

To get a quality crisp and coherent full range of sound from a superthin speaker Sound Barrier custom designed and engineered the Falcon 20 to be a true coaxial speaker. Utilizing specially developed custom cone paper for both the 4" air suspended woofer and 17/8" cone tweeter the bridgeless construction of the Falcon 20 generates an unobstructed and unheard of new level of high quality full range performance.

The Falcon 20's 20 watts of power will electrify your ears bolting you into an unbelievable new dimension of full sound from a superthin speaker.

The Gift: Sound Barrier's YF-1 6 Auto -reverse and YF-1 7 auto eject stereo cassette players with a built-in 5 band graphic equalizer and 50 watt AMP will amaze you tha: miniatorization ,u4*. (57/e"x 2"x61/4") like this launches you into the unknown dimension of minuscule distortion. BRAVO 202 én I Graphic Equalizer a. The Bravo 202 Challenge: How do you crea:e a 7 band high quality responsive graphic equalizer that is only 1 inch thick? Ask for the Sound Barrier Bravo 202 and you'll see! i YF-16 to-Reverse Car Stereo i assette Player nth Graphic Equalizer. i

Model YF-17 BARRIER` For more information about Aulo.Elecl Car Stereo SOUND Cassette Player Sound Barrier auto systems and speakers or with Graphic Equalizer. your nearest dealer write:

SOUND BARRIER CORP. 1050 E. Dominguez Unit -P Carson, California 90746

Enter No. 42 on Reader Service Card 100

next and, at the extreme right, there is a button to switch off type, servo -controlled by a quartz -locked frequency genera- the quartz lock mechanism and a variable speed control. The tor. front panel and motor top plate are of satin -finished alumi- Measurements num which makes a pleasing contrast to the pair of dark gray For test purposes, an Empire EDR.9 phono cartridge was end -pieces. mounted in the headshell, and tracking force was set to 1.5 g The arm is a conventional S-shaped design made of highly with the anti -skating dial turned to a similar figure. The first polished aluminum and measuring just over 91/2 in. from pi- test was for wow and flutter, and the combined figure mea- vot to stylus. Bearings are spring -mounted gimbal types, and sured 0.03 percent, using the DIN 45 507 weighting method. the headshell is made of lightweight magnesium. The arm Rumble was a low 63.5 dB (ARLL rating). Arm resonance with base rests on a heavy aluminum die-casting which is mount- the Empire cartridge came out at 8.5 Hz, with a rise of only ed on the base board, together with the motor, and isolated 2.5 dB. Tracking error was measured using the new db Sys- from the top panel by a spring suspension system. An anti - tems protractor and, as expected, it was within 0.4 degrees skating dial is located near the arm base and, like the rear per inch. Bearing friction is not quoted in the specifications, counterweight, it is calibrated from 0 to 2.5 g. The platter is but it was completely insignificant in both vertical and hori- made of die-cast aluminum with a polished bevel edge and zontal modes. Calibration of the tracking force weight was weighs about 4 lbs., while the motor itself is a Hall -effect Continued on p. 709

AUDIO January 1980 SCOTCH® METAF1NEI TFE TAPE THAT INSPIRE AWHOLE NEW GEIERATUON OF GASSEITE DECKS.

It was inevitable. When high frequencies, Onkyo. Depending upon the deck, tape technology leaps forward a 10dB improvement over Metafine can extend recording fre- as far as it has with the advent today's standard chrome tapes. quency response from today's of Scotch Metafine, it's bound to cause When you're dealing 30-16,000 Hz ranges to (you won't considerable change. with a tape that has this kind of believe it until you hear it) 20-20,000 Hz! Scotch Metafine is the world's magnetic density and output first metal particle tape. Output is 21/2 potential, ordinary decks can't handle o it. To record, you need a head that MAXIMUM OUTPUT LEVEL

., I @ p S áÊ"r ti4Mi

ONKYO TA -2080 - Scotch Metafine tape has brought Ini, -eT rey,. cassette recording almost to the limits of the audible range. It has created PIONEER CT -F1250 a new cassette recording system can handle twice the current demanded that can truly match the rest of your by today's oxide tapes. And components in audio performance times greater than chrome at low these sophisticated decks are here now. potential. It is, in the full sense of the frequencies. Three times greater at Ircluding leaders like Pioneer and word, a breakthrough. SCOTCH RECORDING TAPE. THE TRUTH COMES OUT.

No. 3M Enter 51 on Reader Service Card DB Systems Model DB -6 Stereo Power Amplifier

Manufacturer's Specifications Frequency Response: 20 Hz to 40 kHz, from 20 Hz to 1 kHz; greater than 40 Power Output: 40 watt continuous per +0, -1.0 dB. at 20 kHz. channel, 8-ohm loads, 20 Hz to 20 Input Sensitivity: 1.0 volt for rated out- Output D.c. Offset: Less than 5.0 mV. kHz, with no more than 0.003 per- put. Power Requirements: 120 V, 50/60 Hz, cent THD (60 watts, 4 ohms, 0.008 S/N Ratio: -113 dB re: full output, "A" 52 watts; no signal applied. percent THD). weighted; -96 dB re: 1 watt output, 102 Dimensions: 16 in. (40.65 cm) W x 12.8 SMPTE IM Distortion: Less than 0.002 "A" weighted. in. (32.50 cm) H x 4.9 in. (12.45 cm) D. percent. Slew Rate: Greater than 15 V/ p S. Weight:18 lbs. (8.18 kg). TIM Distortion: Less than 0.04 percent. Damping Factor. Greater than 400 Price: $495.00.

DB Systems calls their Model DB -6 a "precision amplifier," Circuit Description and it certainly is that. Of course, the level of performance A complete schematic diagram of the signal section of the and reproduction of which the DB -6 is capable does not DB -6 is shown in Fig. 1. C109 and C110 form a high-pass filter come cheaply, so if you are an audio fan who judges ampli- which is bootstrapped around the input stage, and D120 fiers on a simple dollars -per -watt basis, you will probably through D133 protect the input against damage from overly wind up looking elsewhere. On the other hand, if you are high input -signal levels. R140 is the only adjustment control using inefficient or even moderately inefficient speakers in a in the entire amplifier and is used to set the d.c. offset to home environment, you will be extremely surprised at how within 5 millivolts. Q103 and Q106 form a bootstrapped much good sound this amplifier will deliver; further, even if cascode combination with the input stage. Q107 and Q108 driven into clipping, it recovers beautifully, not degrading are a current mirror load on the previous stage. Q109 through sound in such a situation anywhere near as much as substan- Q113 are cascode-connected voltage -gain stages. The output tially higher power -rated amps are likely to do. is a triple Darlington with three parallel -output power devic- The amplifier physically appears quite conventional, with es for a large safe operating area. The emitter resistors (R119 only a toggle On/Off switch, a power indicator light, and a through R132) are non -inductive carbon -composition types pair of clipping indicator LEDs (one for each channel) to eliminate possible ringing and phase shift within the am- mounted on the front panel. Heat -sink fins spaced across the plifier. rest of the front panel give the unit a rugged and professional Not shown is a safe operating area protection circuit which look. also senses clipping and clamps internal stages to prevent In addition to the usual speaker output terminals and in- "latch -up" yet allows fast recovery. The circuit also drives the put jacks, the rear of the amplifier shows only the line cord peak -indicating LEDs and incorporates turn -on, turn-off tran- and the projecting rear end of the massive power transform- sient suppression which is accomplished without the use of er, mounted with its longest dimension in a horizontal plane relays. to keep the height of the amplifier down. Three fuses are The power supply (not shown) is fairly conventional, with located within the chassis, and access to them is gained by ferrite bead and capacitor filtering as well as double electro- removing the four screws which keep the metal cover -wrap static shields to reduce line -carried r.f. interference. The out- in place. One of these is a slow -blow line fuse, while the put of the amplifiers is bypassed with 0.005- and 0.22- pE other two are speaker protection fuses. If either of the speak- capacitors to reduce r.f. interference carried in by speaker er fuses blows, the appropriate peak indicator on the front cables. panel remains lit. DB Systems supplies 5 -ampere speaker fuses, but recommends substitution of lower values if speak- Laboratory Measurements ers used with the amplifier have lower recommended fuse The residual noise and distortion of our signal source pre- values. vented us from coming up with any meaningful steady-state

AUDIO January 1980 4

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+ 1 measurements at low power levels. At rated output (for 8 - an amp with its relatively low continuous power rating. Only ohm loads), the amplifier produced a harmonic distortion a few measurements were made with a 4 -ohm load, but level of 0.0055 percent, while SMPTE-IM for the same output enough to verify that the same margin of extra power was level measured only 0.0025 percent. At 50 watts per channel available (75 watts on a continuous basis as against the 60 - output, both THD and IM increased to 0.04 percent, just be- watt rating) as in the case of 8 -ohm operation. low the onset of clipping. It should be noted that the amplifier delivered power with- We suspect that the slew rate of this amplifier is far greater out any shutdown down to 2 -ohm loads and, in the 8 -ohm than the 15 volts per microsecond specified, simply because load condition, we were able to parallel a 100 pF capacitor when we attempted to measure IHF Slew Factor (the high across the load while the amp delivered full rated power at a ultrasonic frequency at which THD increases to 1.0 percent test frequency of 200 Hz, with no evidence of instability. for rated input voltage), we ran out of frequencies at 100 kHz As nearly as we could judge, what very slight CCIF IM -a slew factor of 5 (100 kHz divided by 20 kHz, the upper- distortion we could detect using our spectrum analyzer most audio frequency) and still weren't even approaching amounted to around 0.04 percent, and the same value was the 1 percent THD point. obtained when we measured IHF IM distortion using the Frequency response, for a -1.0 dB roll -off, was also better two-tone method of IM testing described in previous reports. than claimed, extending from 20 Hz (where the built-in sub- Figure 2 shows results obtained using 19 -kHz and 20 -kHz test sonic filter begins to take hold) to 50 kHz. For the -3 dB signals of equal amplitude, while in Fig. 3 we show results points, we measured 14.5 Hz at the low end (the turnover obtained when the two test tones are changed to 14 kHz and point of the aforementioned filter) and a surprisingly high 15 kHz. (Sweep is linear rather than logarithmic, so frequency 123 kHz at the high -frequency end of the spectrum. The sub- notations at the top of the scope face should be ignored. sonic filter causes infrasonic response to be attenuated by 6 Sweep extended from 0 Hz to 20 kHz, at a rate of 2 kHz per dB at 10 Hz and by 15 dB at 5 Hz. Dynamic headroom was division, horizontally. Vertical sensitivity is 10 dB per divi- quite high for this amplifier, measuring 2.11 dB. That's equiv- sion.) alent to a short-term power output rating at 8 ohms of 65 We were unable to measure as high a damping factor as is watts, which may account for why this amplifier seems able claimed for this amplifier, simply because our leads from the to deliver greater sound levels than would be expected from amp terminals to the test equipment probably contributed Continued on page 108

11)4

AUDIO January 1980 , (),9 jr4+0 When 4e,e 4e share interests e 4, in High Fidelity, is the gift to give. Give Gift Subscriptions to all those on your list and save $2 on the subscription price. (List additional names on separate sheet.) Here's gift to you when you order gift subscriptions you will receive the audiophile fix -it tool of jewel-like practicality!

send gift subscriptions at special rate of $10 each ( *$5.50 saving on YESnewsstand price) with a gift card from me to the following list:

1 Name 3 Name Address Address City/State/Zip City/State/Zip

Name 4 Name o 2 Address Address City/State/Zip City/State/Zip

PLEASE BILL MY: o o AMERICAN EXPRESS VISA Rush this order to: MASTERCHARGE DINERS CLUB AUDIO GIFT MANAGER ACCT. NO. North American Building Exp. Date 401 North Broad Street Signature Philadelphia, PA 19108

MY IS ENCLOSED CHECK 1/80 Sherwood Model S-32CP Stereo FM/AM Tuner

Manufacturer's Specifications Stereo Separation: 45 dB at 100 Hz, 35 General Specifications FM Tuner Section dB at 10 kHz; 1 kHz, see note. Power Requirements: 120 V, 50/60 Hz, IHF Usable Sensitivity: Mono, 9.84 dBf Frequency Response: 20 Hz to 15 kHz, 10 watts. (1.7 pV). +1.0, -2.0 dB. Dimensions: 17 in. (43.18 cm) W x 51/4 50 -dB Quieting Sensitivity: Mono, Stereo and Muting Threshold: 17.23 in. (13.35 cm) H x 123/4 in. (32.4 cm) 14.17 dBf (2.8 pV); stereo, see note. dBf (4.0 pV). D. S/N at 65 dBf: Mono, 74 dB; stereo, 68 Output Voltage: 0 to 1.0 V variable Weight: 14' lbs. (6.6 kg). dB. and 600 mV fixed. Price: $250.00. Capture Ratio: 1.0 dB. Selectivity: 70 dB. AM Tuner Section I.f. Rejection: 60 dB. IHF Sensitivity: 15 pV. Note: The two specifications called Image Rejection: 60 dB. Selectivity: 25 dB. out above are named "Certified AM Suppression: 65 dB. Frequency Response: -6 dB at 4 kHz. Specifications" by Sherwood, and Spurious Rejection: 85 dB. Image Rejection: 45 dB. the exact performance of each unit in 106 THD: Mono, 0.1 percent at 100 Hz and Spurious Rejection: 40 dB. each area is measured and listed on a 1 kHz, 0.15 percent at 6 kHz; stereo, Output Voltage: 0 to 300 mV variable, "notarized" certificate packed with 0.2 percent at 100 Hz and 1 kHz, 0.25 180 mV fixed; both for 30 percent each unit purchased. percent at 6 kHz. modulation.

The Sherwood Model S-32CP FM/AM tuner is a low-cost ing these functions on one switch, thereby limiting the lis- unit with relatively few convenience features or frills, but one tener to strong -signal stereo reception even if that listener that offers exceedingly good fundamental performance for wants to listen to weaker signals in stereo. its price. For most FM listeners, it should prove to be a more - The upper portion of the dial area, at the top of the front than -just -adequate tuner component, especially when you panel, contains two meters, one for signal strength indica- consider the quality level of most of what is currently being tions, the other for center -of -channel tuning on FM. Finding broadcast over FM in this country. two meters on a tuner in this price category is, in itself, rare, The few controls along the lower portion of the front panel but finding a center -of -channel meter that correlates perfect- of this tuner include a Power On/Off lever switch, a rotary ly with true lowest -distortion tuning across the FM band is Output Level control, a program Selector switch with settings even rarer-at any price level. (Such correlation turned out to for mono FM, auto stereo FM, and AM, a large tuning knob be excellent in the case of the S-32CP.) To the right of the coupled to a flywheel dial -pointer arrangement, an MPX meters are three indicator lights for stereo FM and AM or FM "blend" filter lever switch, and an FM Muting switch. It is program indications. Just below are a long, linearly calibrated interesting that Sherwood is able to supply separate mono/ FM frequency scale with markings at every 200 kHz and a stereo switching and muting switching, while makers of some similarly expanded AM frequency scale. tuners and receivers costing much more insist upon combin- The rear panel of this Sherwood tuner is equipped with two pairs of output jacks-one providing fixed levels, the Fig. 1-Mono and stereo quieting and distortion characteris- other controlled by the level control on the front panel. This tics, FM section, Sherwood S-32CP. double output arrangement not only frees up a record -out pair of jacks on any associated preamplifier or integrated am- MICROVOLTS, ACROSS 300 -OHM ANTENNA TERMINALS plifier (and with all the new sound processing add-ons avail- 1.74 5.5 17.4 55.0 174.0 550 978 1740 5500 0 able, most of us can use every tape monitor circuit we've got-and more), but permits the user to vary listening levels a e of AM or FM program sources by means of the front -panel - 20 10.0 2 level control without altering recording levels being fed to a ó connected tape deck. 40 1.0 N Screw -type terminals are provided for 75 -ohm or 300 -ohm MONO THD0.09% : e-- C FM antenna transmission lines and for an external AM anten- STEREO TH00.065 % u .... z na, should one be required. A pivotable AM ferrite -bar an- -60 0.1 rc tenna is also located on the rear panel. A three -position slide Q is located near has STEREO S/N720B 1 _ switch the output jacks and settings for MONO S/N77U8 -80 001 75-, 50- or 25 -microsecond de -emphasis. 0 10 20 30 40 50 60 65 70 80 AUDIO January 1980 SIGNAL INPUT POWER- 081 (0 0131 I x 10- 5 WATTS) 10

FM Performance Measurements quency response was down 2.0 dB at 15 kHz, as shown in Fig. Usable monophonic sensitivity measured 10.3 dBf (1.8 2. Also plotted in the 'scope photo of Fig. 2 are the separation NV), while mono 50 -dB quieting was obtained with signal characteristics without the MPX blend circuit (lower trace) strengths of 14.1 dBf (2.8 NV) as claimed. Stereo sensitivity is and with that circuit activated. We measured 50 dB of separa- one of the specifications which is supplied by Sherwood on a tion at 1 kHz, 53 dB at 100 Hz, and 38 dB at 10 kHz without separate "certified performance" sheet, along with stereo using the blend switch. When the blend switch is used, sepa- separation at 1000 Hz. Unfortunately, there was no such indi- ration decreases to 16 dB at mid -frequencies and to around vidual sheet in our sample, so we could not verify the "certi- 10 dB at 10 kHz. The switch should only be used when listen- fication." (Editor's Note: The "Certified Performance" sheet ing to stereo FM signals that are otherwise too noisy to enjoy. was apparently lost in transient; however, results were more Crosstalk components appearing in the unmodulated than adequate.) In any event, our sample had a measured channel output when a 5 -kHz signal is used to modulate the analyzer stereo sensitivity of 17.2 dBf (4.0 NV), governed more by the desired channel fully are depicted in the spectrum stereo threshold point than by actual quieting or distortion photo of Fig. 4. The large signal at the left is the 5 -kHz "de- figures. The 50 -dB quieting point was obtained for stereo sired" signal (sweep is linear and at a rate of 5 kHz per divi- with input signals of 39 pV (37.0 dBf) as against 34.7 dBf sion, with vertical sensitivity equal to 10 dB per division), and claimed. superimposed upon it is the actual 5 -kHz signal detected in Distortion levels were extremely low for a tuner in this the unmodulated channel output. That signal is some 48 dB price category, measuring a mere 0.09 percent in mono and lower than the desired signal. To the right are distortion com- an even lower 0.065 percent in stereo. Quieting and distor- ponents at 10 kHz and 15 kHz, as well as a residual 19 -kHz tion characteristics as a function of signal strength are shown pilot signal component, all of which are approximately 60 or in the graphs of Fig. 1 (for a 1 -kHz modulating signal). Fre- more dB below the reference desired signal level. Fig. Fig. 2-Frequency 3-Crosstalk components for a response and stereo 5 -kHz modulating FM separation. signal. Figure 4 is a graph showing distortion versus modulating Fig. 5-AM frequency frequency for both mono and stereo FM reception. THD in response. mono at the frequency extremes of 100 Hz and 6 kHz measured 0.075 and 0.13 percent, while for stereo, we obtained readings of 0.12 and 0.16 percent. AM suppression measured 63 dB, while capture ratio measured exactly 1.0 dB as claimed. Image, i.f., and spurious rejection were all better than claimed, with readings of 65, 63, and 90 dB respectively. Stereo switching threshold was set at 4.0 pV (17.2 dBf), while muting threshold was set somewhat higher, at 7.0 pV (22.1 dBt). AM frequency response, depicted in Fig. 5 (here the sweep Listening and Use Tests is logarithmic again, so that frequency notations at the top of It is only reasonable that in a tuner of such low cost a few the 'scope face do apply), was surprisingly flat within the performance areas have to be compromised to some extent. pass band which extended from around 40 Hz to 4 kHz for In the case of the S-32CP, such secondary specifications as the -6 dB end points. While this hardly represents "high fi- image, i.f. and spurious rejection are not as high as they are delity" performance, it is actually somewhat better than what on the most expensive models. However, in most listening we usually encounter in typical AM tuner circuits for prod- situations, such deficiencies seldom cause serious problems. ucts costing considerably more than this Sherwood tuner. With a good outdoor antenna, properly oriented for best reception and lowest multipath interference, we could not tell Fig. 4-Distortion vs. frequency. any difference between the quality of received mono and stereo FM broadcasts heard on the Sherwood S-32CP and ----- 40 _::a::::t-:::; those heard, for comparison purposes, on a tuner costing MMuuIMMIBMBRuuZEMBMuZuC:::::I.....11M....., MIIIIIIMIIIIIMuuIIIIIIMullu11111111111113111111n1. MONO u - - STEREO - 11° fully twice as much. With a simple indoor dipole antenna, MBRIIIIIMRRIIIMMR111 - MM11113111111 IIIIIIMMEOIlïlMM11111 some differences were noted when the same comparisons 1111113111111IIMZ1111111 z MZIMIIIIIIIMMI were made, with the Sherwood tuner producing a bit more o noise on weaker stereo stations. Still, when you consider the 01 MII!_!_!!!M11111II.12`&!!lI.11IIIIII O mmdiilmr.c.ä.immuuummiuuui fact that a decent outdoor antenna can be had for $25.000 or ffl.88111ffl..MIM.InIM.II11 so (and is not too difficult to install yourself), the money you E MIIIIIMIBIBI111IIMMIZINI111MMB31111M11131111II1I 1113111111111111111111311111111111I1111111111MMIIIIIIMMI1111 save on a no -frills tuner such as the S-32CP will represent a MII11IIIIIMIZE1111112111111111MB1111111 very considerable amount. Considering the present state of most FM broadcasting, such apportioning of your hi-fi com- 0.01 3,11'111111111,1111111M,111111I,tl11111 80 10 100 1k 10k 20k ponent budget makes a lot of sense. Leonard Feldman 108 FREQUENCY - Hz Enter No. 93 on Reader Service Card

Fig. 2 - Twin -tone Fig. 3 - Twin -tone IM measurement IM measurement using 19- and using 14- and 20 -kHz signals. 15 -kHz signals. (See text for scales.) (See text for scales.)

DB Systems'continued from page 104 degree of warmth on the heat sinks even when the amplifier more resistance than the entire internal resistance of the am- is operated in its quiescent mode (with no signal applied) plifier. We wondered, however, whether the 400 figure quot- since the people at DB Systems are apparently forward bias- ed by DB Systems could possibly be realistic in view of the ing the output stages pretty heavily to avoid any such low- speaker protection fuses. Then we took another look at the level, higher -order harmonic distortion. Clearly, if high power schematic and realized that the speaker protection fuses are at low cost is what you are after, you can buy a lot more not in series with the output signal but are installed in the watts for the price of the DB -6 than are being offered by DB main negative -feedback loop. Pretty clever, in our view! Systems. But if the subtle differences between "brute force" designed amps and amps that offer utterly clean and accu- Listening and Use Tests rate sound reproduction are what you are after, power out- The DB -6 is, first and foremost, an accurate sounding am- put limitations won't stop you from enjoying the sound qual- plifier. Even when deliberately driven into clipping, and se- ity of this finely crafted piece of equipment. Should you feel, vere clipping at that, the sound peaks produced are more as we do, that this is one great sounding amplifier but that reminiscent of what we fondly used to call "tube sound" you require higher power, you can always turn to DB Sys- than they are of most solid-state designs we have auditioned tems' strapped, mono version, the DB -6M, which delivers a recently. Recovery is, as the makers claim, effortless and al- full 140 watts into 8 ohms at less than 0.008 percent from 20 most instantaneous. At ultra -low listening levels there is not Hz to 20 kHz or 225 watts into 4 ohms at less than 0.02 even the slightest hint of crossover or notch distortion. In percent over the same power band. Leonard Feldman return for this Class A -like sound one has to accept a fair Enter No. 92 on Reader Service Card Mitsutishi Micros/continued from page 96

The signal -strength LED bank is, in our opinion, superior to room for a high -cut filter which some purchasers of a full - the conventional mechanical signal -strength meter arrange- featured preamp do feel is important. ment. Frequency calibration was just about perfect from 88 Finally, turning our attention to the M -A01 amplifier, this MHz to 108 MHz, and switching from mono to stereo in the unit does deliver an incredible amount of clean power for its auto-FM mode is non -erratic and noise -free. Center -tune small size, and overall system sound quality (which, in the lock indications (via that green LED) corresponded well with last analysis, is determined as much by this "final" compo- minimum distortion tuning points both on the test bench nent as by the program signals fed to it) could not be faulted and in actual station -monitoring use. in any way. We did note that under no-load conditions, or As for the M-PO1 preamp/control unit, we were particular- with highly reactive loads on the test bench, there is a slight ly impressed by the tone control arrangement which, at the tendency for the amplifier to become unstable. Operated touch of a couple of buttons, was able to introduce precise with our reference speakers, however, no such instability re- and totally repeatable degrees of tonal adjustment. With sulted during our listening tests, though some electrostatic these controls set to flat (no buttons depressed), there was speakers might present problems to this amplifier. However, no audible difference in sound heard with the controls fully we have not verified this, and it does seem an unlikely pair- bypassed or in -circuit. ing. Overall, the MM phono inputs were sufficiently free of The real question regarding this or any other system com- hum and noise so that record reproduction was limited only posed of micro -components is price versus performance. by the surface condition of the records used. Using the mov- Clearly, one could assemble a fairly respectable standard - ing coil inputs, we were able to detect some audible hum sized receiver having equal power and features for less mon- during quiet passages, despite our best efforts to avoid any ey. One could, in fact, even put together a pretty good sys- ground loops or external -field pickup. The accuracy of the tem of standard -sized separates for the same cost. It is equal- RIAA equalization was at once apparent, and on the whole ly clear to us that many potential purchasers will find the record reproduction was tonally well balanced and free of physical format of these micro -components extremely ap- preamp/equalizer-generated distortions of any kind. pealing, and there's no doubt about it, they do look good. The subsonic filter, though possessing a moderate 6 dB/ Whether these micro -components, or others like them, even- octave slope, was effective in reducing subsonic rumble ef- tually capture a significant portion of the audio component fects, as clearly evidenced by an observation of the woofer market remains to be seen. That depends entirely upon the cones of our reference speaker systems. Audibly, the use of unpredictable tastes of the American consumer, who, in the the subsonic filter did wonders for overall clarity and trans- past, has generally felt that "bigger is better." Of course, the parency of record reproduction. Since the filter did not in any current trend towards smaller cars may well signal an overall way degrade musical reproduction (rather, it helped it), Mit- reversal of that attitude. And smaller cars, I am told, often are subishi and others might just as well have incorporated the generally more popular than the gas guzzlers these days. Is there an analogy to be drawn here? Leonard Feldman subsonic roll -off as a permanent feature, rather than as a 109 switchable one, in the phono circuit. That might have left Enter No. 90 on Reader Service Card

Pioneer/continued from page 100 almost instantly as a reverse current is applied to it. A small than ordinary care less than 5 percent low above 1 g. Speed variation was refinement - but it does show that more -6.6 to +9.1 percent, which is more than adequate. has been taken in the design. Because of the floating suspension system, the unit is less prone to acoustic feedback than Use and Listening Tests most. Incidentally, closing the dustcover reduces the chances The PL -630 proved to be a real pleasure to use, and those of direct feedback while allowing access to all the controls - push buttons give a feeling of effortless smoothness with no including the cue lift. fuss or bother. The cue lift had an absolute minimum of The Pioneer PL -630 must take its place among the top few backlash and appears to be very well damped. The platter really good turntables now available under $600.00. At its reaches full speed in less than one-third of a revolution, and, price of $449.00, it offers exceptional value. George W. Tillett when the tonearm swings back to its rest, the motor stops Enter No. 91 on Reader Service Card AUDIO January 1980 Michael Tearson

Jon Tiven fact: the phono cartridge is the heart of hi-fi...

Eat to the Beat: Blondie part of their appeal is and has been Chrysalis CHE 1225, stereo, $8.98 that the camera adores her. Debbie Funny what a little thing like an in- Harry cannot look bad in a picture ternational breakaway smash hit will without great effort. It is not a ques- do for a band. If it comes too fast and tion of if she will make it in movies, too sudden, it can lock the band into a but of when. But she is not the whole permanent adolescense. Like Boston. show. As she stridently states in inter- Less frequently it will give the group views, Debbie Harry is not Blondie fresh poise and confidence to fire their and Blondie is not Debbie Harry. Not work to a new plateau. Like Blondie. by a long shot. After the first two singles off Parallel The band grows with each record by Lines flopped, the disco crowd almost quantum leaps. Their playing and per- by accident discovered Heart of Glass, formance is ever more assured and a wonderful song that discoers can supple. Mike Chapman became their take at face value The hi-fi phono cartridge functions as the and rockers can take producer with Parallel Lines, and he is source of sound (the point at which the as parody. It rapidly turned into a ideal for them. He brings a focus, a recording is linked with the balance of the hi-fi mega -selling worldwide hit and, more clarity, an economy they previously system)-therefore, its role in high fidelity is important to the band, finally gave needed badly. absolutely critical. Just as the camera can be them the big no better than its lens, not even the finest break in America that Then there is the matter of material. hi-fi system in the world can transcend the had previously eluded them. Well, the songs on Eat to the Beat are limitations of an inferior cartridge. The cartridge Anticipating Eat to the Beat I be- the best collection Blondie has pro- represents a relatively modest investment came very concerned that the band duced. Dreaming, the album's which can audibly upgrade the sound of your first Eu- entire record playback system. would wholeheartedly follow the ropean hit, is at once a tough rocker sound of Heart Consult with your nearby Shure dealer who of Glass into utter built upon a drum beat reminiscent of will help you select the Shure phono cartridge discodom. They didn't. They are still a Buddy Holly's Peggy Sue and a that is correct for your system and your rock and roll band first and foremost. dreamy, yearning melody rich with checkbook. We especially recommend that Yet they have the nerve to tackle vari- rhyme and terrific lyrics. you audition the Shure V15 Type IV. Discrimi- ous sounds and do nating critics throughout the world praise them up right. Wit from the sardonic to the bizarre this cartridge as the new standard for faithful True, there is the nod to the Heart of dominates their songwriting. Acci- sound re-creation. It overcomes such ever- Glass vibe with Atomic, but reggae's dents Never Happen (in a perfect present problems as dust, static electricity, backbeat surfaces in Die Young Stay world) is likely a "hot" signals, and record warp lefthanded salute/ that cause Pretty. "clicks" or "pops:' and distorted record Sound -a -Sleep is a lush ballad slap to Elvis Costello, an answer, actu- reproduction. May we send you our brochure? without strings. Union City Blue goes ally more a rebuttal, to his Accidents after the Phil Spector wall of sound. Will Happen (it's only hit and run) Blondie emerges as a mature band from Armed Forces. A companion to with the strength and chops to play Accidents is the album's other Jimmy I---ILJRE whatever they want to achieve their Destri song, Living in the Real World. ends. Shure Brothers Inc., 222 Hartrey Ave., Blondie's time arrived with Parallel Dept. H1, Evanston, IL 60204 The star of the band, the focus, is Lines. It is just that they broke across In Canada: A. C. Simmonds & Sons Limited Deborah Harry, as it has been since different lines than long expected the band's conception. An important which was surprising. Manufacturers of high fidelity components, Obviously suc - microphones, sound systems and related circuitry. AUDIO January 1980 Enter No. 37 on Reader Service Card cess has not fazed them at all, since with Eat to the Beat they have hit a real stride. Not just a step or a pace, but a real full stride. M.T. fact: Sound: B+ a fact: Performance: A Genuine Shure upgrade stylus is the ultimate Mick Taylor Columbia JC 35076, stereo, $7.98. unquestionably ...made more Considering that the guy spent six years of his life as a Rolling Stone, the biggest Mick Taylor comes off as a pretty affordable unassuming guy on his first solo out- bargain in hi-fi ing. Encompassing a wide variety of We strongly urge you to check your stylus styles and with a fairly high quality of for wear at least once a year to protect playing throughout, Mick chooses not your records and maintain the highest 9 to rely upon famed guest stars to sell standards of listening pleasure. him, but has instead come up with an Regardless of when (or where) you album that will not disappoint those purchased your Shure cartridge, there is who enjoyed what he did with The a Genuine Shure replacement stylus Stones. available which will bring your cartridge right back to its original specifications. They could have called it The Many Even better, you may actually be able to Faces Taylor. On Broken of Mick improve its performance significantly over Hands he sticks close to the Chuck the original with a Genuine Shure Berryisms of late -period Stones (sort of upgrade stylus...at surprisingly low cost! similar to Hand of Fate from Black & For example: Blue, the first post -Taylor Glimmer UPGRADE Twins outing. Baby I Want you and IF YOU OWN: WITH: SHURE SW 5 could have been covered by Eric Carmen (or Barry Manilow), Leather Jacket is very Phil Rambowesque (per- nidite' V15, VN35HE haps an obscure reference, but the S . Type III Hyperelliptical two have jammed upon occasion), and SERIES stylus 111 the rest of the album is practically all guitar improvisational tracks. Taylor is Series IIIS teI4M95 N95HE* a more than able soloist, and here is , SERIES Hyperelliptical tone arm some of his best work since Blues from stylus Laurel Canyon, whether it be the blues /A mode or jazz -fusion a la Jeff Beck's N72EJ /geeA By I Blow Blow. Actually, prefer the M70 Biradial cuts on which he sings, as Mick's got a SERIES (Elliptical) stylus fine voice (I hate to say it, but he sort N72B The designers of the award -winning Series Ill of resembles a better version of Ron- Spherical stylus tone arm took on the challenge of developing a nie Wood). Altogether an LP to be tone arm with essentially the same outstanding proud of, though it probably won't ANY M91, N91ED* performance characteristics as the III, Series M92, M93 stylus but at a significant reduction in price. knock Peaches & Herb off the charts. J.T. ANY M71, N75 TYPE 2* The Series IIIS tone arm is an instrument that is M73, M75 Series styli still definitely in the connoisseur class employ- Sound: B Performance: A - ing state-of-the-art materials and technology ANY M44 Series N55E stylus for unsurpassed strength -to -weight ratios in critical areas. Perfectionists will achieve the M3D, M7D N21D* stylus Dream Police: Cheap Trick same flawless performance they have come to 'Before purchasing any replacement stylus be certain expect only in the SME Series Ill. Epic FE 35773, stereo, $8.98 your turntable is compatib e with the tracking force of the stylus you select. Cheap Trick's fourth studio album is The tone arm and shell are combined into a very interesting, not only because one-piece "cartridge carrier' which is remov- Always insist on a able and interchangeable. Coupling is close they're a creative bunch of fellas but to the fulcrum so the carrying arm makes a due to the fact that it was recorded Genuine Shure minimum contribution to the Series IIIS total before their chart -topping Live at Bu- effective mass. dokan made them the big stars they replacement stylus. are today. As a result, Tracking force and bias adjustments are con- the attitude is Look for the name trolled by a sliding weight adjustment. A fluid still of a group trying desperately to damping system is available separately. make it, and you best believe that the "Shure" on the stylus next Cheap Trick album is going to be grip. light years away from this one. But this is Cheap Trick on their knees, appealing to the public to please buy their SHURE S H U R records already, and the result is some Shure Brothers Inc., 222 Hartrey Ave., fine, although somewhat pedestrian, Dept. Ht, Evanston, IL 60204 Shure Brothers Inc.. 222 Hartrey Ave., Evanston, IL 60204 music. In Canada: A. C. Simmonds & Sons Limited Manufacturers of high fidelity components, microphones, sound systems and related circuitry Manufacturers of high fidelity components, microphones, sound systems and related circuitry. Enter No. 38 on Reader Service Card Enter No. 39 on Reader Service Card Oh, there are clinkers - I Know What I Want is Tom Petersson's first vocal and he's still pretty shaky, The House Is Rockin with Domestic Prob- The Legend lems and Writing on the Wall seem like your average Cheap Trick tunes with no surprises, and Gonna Raise Hell (altough it's amusing) shows exactly how far the group is willing to go to be successful -a disco track! What Continues. the heck, you can't blame the guys for trying to be "commercial," but it's so obvious in retrospect that it's almost embarrassing. Enough of the negatives already, there are some lovely tunes here: Way of the World, I'll be With You Tonight, and Voices the cream of the crop featuring Robin Zander's best John Lennon/Jeff Lynne imitation. Rick Nielsen's guitar playing is admirable but not always inspiring. He's definitely worked up a fine technique and in- vents some nice riffs, but when it comes to improvising a solo he only manages to deliver something memo- rable on the slow tunes, which is a shame. However, from time to time he quotes from the books of Jimmy Page (Think About It) and The Beatles (Please Please Me) just to show he's got enough taste to steal from the right sources. 112 The New Dynaco A150 The sound of Dream Police is per- &A250 priced from $150. haps the least adventurous thing about it: The mix is mundane, the drums recorded very conservatively, and the whole texture of the sound lacks individuality. It should be very interesting to hear Cheap Trick's next Dynaco helped create modest cost. Each in its album, the one where they drop all stereo hi-fi 25 years ago. own way will make you their cares about being popular and We built a reputation based part of a listening experi- just go the aesthetic route. My bet is on that you're going to find an album far rigorous yet simple de- ence that for 25 years has noisier, much more interesting, and far signs that produced more meant only Dynaco. less conventional than Dream Police. sound than the industry To sample that ex- And it's about time that they were al- had ever seen. perience, take your favor- lowed that privilege. I.T. Now we've come back ite record album to your Sound: C+ Performance: 8+ to do it again. With two Dynaco dealer. Lean back new speakers that are far and listen. You'll hear that Shades of Ian Hunter: The Ballad of and away the best we've Dynaco sounds better than Ian Hunter and Mott The Hoople ever built. Each of these ever. And the legend will Columbia C2 36251, stereo, 2 discs, systems continues the continue. We have many $9.98. Dynaco legend of simplic- new and Forget that it's the bargain of the exciting products century, two albums for ten beans - ity and performance at a coining your way. forget that nothing on the album is less than two years old, 'cause this is over 90 minutes of state-of-the-art

rock 'n' roll from Ian Hunter. I won't say that everything good he ever did is

on these two records, but I can une- quivocally state that there's at least three sides of stuff that is absolutely CID great We build them like we used to. and plenty of tracks that even se- la rious Ian lei Hunter fans havn't been able to get their hands on. And even 110 Shawmut Road Canton, Mass. 02021 (817) 828-7888 though I like his Schizo album plenty,

AUDIO January 1980 Enter No. 14 on Reader Service Card there ain't a track on it that could hold bums. just thank your lucky stars that a candle to anything here, and that's it's available at all and in one well - no hype, son. conceived package to boot. An excel- First, you get the hits: The obvious lent gift for both budding punk rock- All the Young Dudes, a Mick Ralphs ers and old fogies alike, and a list price tune which mutated into Bad Co.'s you can't beat .. who says there is no Can't Get Enough called One of the justice in this world? J.T. Boys, and various other Mott goodies that I won't dwell on as you should Sound: A- Performance: A+ know them by heart. Then the U.K. singles and flip sides (Saturday Gigs, The A's Foxy Foxy, Where Do You All Come Arista 4238, stereo, $7.98. From, R.I.P., and Rose) and the rather The A's are a charged -up young astounding bonus of a live rendition American group with energy and of Marionette, a tune from the last catchy tunes to beat the band. The Mott album which, in this particular opener, After Last Night, is a glorious incarnation, easily stands the test of for business reasons, but stands as Roy rocker with some dandy smart/stupid time. Side three is a synopsis of Ian's Baker's finest production since Queen lyrics. Grounded is another, as is Teen- two American solo albums, of which II - on this he pulled everything out age Jerk Off. Who's Gonna Save the the first was a gem and the second of his bag of tricks to make Hunter's World? is in a Roxy Music/Cars space. eminently forgettable aside from the most quirky yet relentless LP ever. Four It's not all there yet. Some songs are two tracks offered here. tracks from this album are found here decidedly lightweight, but there is But side four - that's the killer. Be- to delight the listener, as well as a spe- more than enough meat to make The cause back in 1977 Hunter put togeth- cial added attraction: England Rocks, a A's a very strong debut. The producer an outfit called The Overnight An- single by the Overnight Angels under - tion is nothing special, but it never gels for one last solo album on CBS. It produced by Hunter, but far more in- gets in the way of a good song, and featured Peter Oxendale (an excellent teresting than its illegitimate son, the band's good spirits prevail anyway. keyboardist now a solo artist in his Cleveland Rocks. Heck, if the Twist and Shout strains own right), Earl Slick (a hard-hitting Now, you may have to turn up the woven into Grounded don't make you Ronson clone), and Dennis Elliot (For- volume a little bit higher than usual to smile, you're just not a rock & roller. eigner's drummer) and was produced groove out to Shades of Ian Hunter, as It's that simple. M. T. by Roy Thomas Baker. This particular they had to drop the level a tad in or- record was never rleased in America der to fit all this great stuff on two al- Sound: B- Performance: B+ 113

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Enter No. 17 on Reader Service Card John Diliberto

114

Upon Reflection: John Surman lord's manor. Not far from the dancers, I Loved You Then ...: Gayle Moran ECM -1-1148, is ECM stereo, $8.98 however, the ominous dirge of Be- Warner Bros. BSK 3339, stereo, $7.98. John Surman is the pride of the Brit- yond a Shadow. Dark, sustained saxes One of the peculiarities of the ish jazz community. Though he is one underpin a tortured lament by Surman fusion movement has been the affinity of the few baritone sax virtuosos on baritone sax while synthesized of many of its musicians towards dif- around, it is as a multi -reed player that bells chime eerily from beyond. ferent spiritual movements. John he has made his mark. His various Surman has wrought this work with McLaughlin comes immediately to horns have been found in collabora- an uncommon care for detail and mind with his Mahavishnu Orchestra John tion with McLaughlin, Karl Ber- subtlety. Caithness to Kerry is a sweet , and dedication to Sri Chinmoy. But ger, Mike Westbrook, Terje Rypdal, happy folksong on which Surman there are many others, including and Albert Mangelsdorff in efforts that plays unaccompanied soprano sax Charles Lloyd (Transcendental Medita- are never less than adventurous. Upon with notes that bend as they ehco off tion) and Chick Corea (L. Ron Hub- Reflection is his second solo outing. the hills. From the simplicity of record- bard and the Church of Scientology). Like its predecessor, Westering Home ing a solo sax, he moves to the multi - All these musicians have claimed to (HELP 10), it is an introspective work layered Constellation. It's a starbound use music as both a way of inner ful- featuring Surman either solo or multi - fugue of sequencer counterpoints and fillment and a communication of spir- tracking himself. But unlike Westering slowly evolving bass moans that pro- itual values with their audience. For Home, Surman uses synthesizers and a pel Surman's twisting soprano in a some, like The Mahavishnu Orchestra, layered overdubbing to make this journey of awe and amazement. this communication took the form of work texturally interesting and melodi- Upon Reflection is a quintessential scorching and breathtaking music that cally complex. example of the ECM/Manfred Eicher aspired for the heavens. For others, it As a set of tone poems, Upon Re- production style. Each instrument is runs along the lines of placid content- flection traverses many moods that recorded with a clarity and isolation ment and fatuous self-satisfaction. have a distinct flavoring of the Renais- that is unheard of in most recordings. Gayle Moran falls into the latter cate- sance with a few of the songs designed Surman's compositions and Eicher's gory. as dances. Edges of Illusion is a mid- production fit together in perfectly Like Chick Corea, with whom she night stomp of trolls and elves in a balanced fashion. John Surman has has been singing and playing key- mist of sequencer patterns, lopping crafted an album of provoking con- boards for the last three years, Gayle baritone sax bass line, and a plaintive templation. Moran follows the teachings of L. Ron bass clarinet soloing on top. Prelude John Diliberto Hubbard and the Church of Scientolo- and Rustic Dance accompanies the gy. Her lyrics are rife with allusions Sound: A Performance: A to peasants dancing outside their feudal the inner happiness she has derived from Hubbard, such as "You can play solo full of perilous leaps and plunges. idea of fusion music: Improvisational with the outside but the inside is here Hino seems to play best when he's music incorporating strong rhythms to stay" from Outside/Inside. Moran's with people that have an electric and electric instruments. Like most im- mellifluous soprano is wrapped fusion consciousness. And here he's provised music real fusion doesn't al- around her childlike keyboard filigree certainly among the finest. ways succeed. It doesn't even have and bathed in a glycerine of strings Wishes is another record leased to that standard level of cliched virtuosity and vocal choirs. Nostalgia and wist- Inner City from the prolific East Wind we've come to get from most groups. fulness eventually drown through lack company in Japan. Their straight for- But when these groups get it together, of tension and dynamics. ward production manages to record as Kochi frequently does, you know I Loved You Then ... has all the each instrument cleanly yet maintain that collective creativity is what it's all earmarks of a Chick Corea production. that rough edge of spontaneity that is about. John Diliberto Moran's simple melodies are set in a frequently missing from American satin background and surrounded by fushion albums. Recorded back in Sound: B- Performance: B - cute, cliched counterpoints and punc- 1976, Kochi represents the original tuations from such stalwarts as Stanley Clarke. Victor Feldman, and Corea himself. For those who seek a soft and soothing sound that won't interrupt your self -contemplation, your spiritual muzak is here. John Diliberto Sound: B+ Performance: C ALLY, Wishes: Kochi Inner City IC 6021, stereo, $7.98. Kochi is actually a one-shot deal with Japanese keyboard player Masa- bumi Kikuchi fronting an American group composed of Miles Davis per- EGG. sonnel from the mid -'70s. Steve Gross- man and Dave Liebman handle the Leigh pioneers the new shape of sound. reeds, with Reggie Lucas on guitar and Leigh is proud to lead the way into the which permit the use of continuous interior a rhythm section of Anthony Jackson Eighties with a shape that will revolutionize curves and create its unique sound. on bass, Al Foster on drums, and the world of speakers. The new shape of Sound so pure, sound unfettered by flat M'tume on congas. The group is finally sound: The Leigh ECD" You'll probably surfaces and sharp edges. Sound so rounded out by fellow countryman call it The Egg. It represents the uncolored it seems to just appear Terumasa Hino on trumpet. Though it breakthrough in speaker design in the air. that everyone has been Try a pair. is Kikuchi's show, it is Hino who grabs waiting for. You can position them all the light. We've put our 56 years of almost anywhere ... floor, The opening track of Wishes, Auro- experience into producing ceiling, walls. Then sit ral Flare, seems to promise an ambi- this speaker. The ECD is back and let the new tious East-West fushion. But the result molded from energy shape of sound wash absorbing compounds over you. Unforgettable! is only a temporary graft. After an intro featuring some primitive Biwa (a Elliptically Controlled Diffraction stringed instrument) over a keyboard drone and shakuhachi-like flute, the group comes in for a strong rhythmic vamp with everyone noodling around while someone takes a solo up front. This format can work when the leader is a Miles Davis or the group is made up of intuitive geniuses like early Weather Report. But here things frequently founder with no direction. Ki- kuchi's keyboard style consists of tex- Available at leading audio dealers in Canada and the U.S. tural shading, punctuation, and filling For the name of your nearest dealer, in cracks but he never really takes write to Audio Marketing Group, Leigh Instruments Limited, Audio and Power Division, - 350 Weber St. North, Waterloo, Ontario. Canada. N2J 4E3 command with anything more than Telephone: (519) 889-9510. Telex: 069-55990. some high -volume organ chords similar to Miles Davis' work on that instrument. LEIGH Listen to Leigh Terumasa Hino does step out, however, and when he solos the rhythm section cooks noticeably harder. In particular, on Electric Ephemeron the group nods along until halfway through, when Hino takes a riveting AUDIO January 1980

Enter No. 7 on Reader Service Card Classical Edward Tatnall Canby reviews

116

Vivaldi: Four Seasons. Vivaldi Ensem- good, the sound is mostly extremely Adrian Boult on Vanguard, my choice ble Tokyo, Hayakawa. RCA RDCE-501/ fine, the 13 players have all the impact ablve ALL others for sheer Beethoven 2, 2 discs, 45 rpm, stereo, $27.95. of 70 in the big, reverberant hall; the enjoyment. Same here! Far too often This Japanese series began at 45 surfaces on the discs are excellent, the these little concerti, or concertos if you rpm, then reconverted to 33 as maybe cutting level remarkably high (possible will, become slick vehicles for ambi- more practical; now, with each of the at 45, I suppose) - so all is well! tious violinists on the make, and on four concertos, and four seasons, on Do not confuse these continuing RCA the orchestral side, are treated as not one side, 45 turns out to be ideal, as- imports, produced by a Japanese affili- very important. No such high-and- suming your turntable can play it. (I ate, with RCA's own American digital mighty attitude here. Just lovely, easy wrestled 10 minutes with belt and pul- operation launched earlier this last music. And Henryk Szeryng, he of the ley in the inner darknesses of my year. Both are good but they are unre- unrememberable spelling, plays a equipment cabinet before I got things lated, in personnel and in technique. wonderfully modest and appropriate going.) fiddle part, beautifully blended into Somehow, these recordings exist in Sound: A Recording: A- Surfaces: A - the orchestra. Believe me, you will not another world, oddly out of step with do better on this Mozart. Even the re- current developments and yet, even Mozart: Violin Concertos in D, K. 218; cording is lovely - and it's a "low so, at the top in terms of sonic quality. B Flat, K. 209; Adagio in E, K. 261; Ron- priced" item, presumably a re -issue. Direct -to -disc, all of them, and not a do in B Flat, K. 269. Henryk Szeryng; mention of digital. I.e. modern, but New Philharmonia Orchestra, Sir Alex- Sound: B+ Recording: A- Surfaces: B+ not ultra -modern. And the mike tech- ander Gibson. Philips Festivo 6570 109, nique, also excellent, is just a wee bit stereo, $6.98. Tchaikovsky: Manfred Symphony. dated, with a lot of different micro- One of the nicest recordings of early New Philharmonia Orch., Ashkenazy. phones spread around here and there. Mozart violin concerti I have ever London CS 7075, stereo, $7.98. Even the music is a tiny trace old-fash- heard, fresh spontaneous, unaffected, What a big fat sound! I had not ioned - the Japanese still do their Eu- enthusiastic and meticulously accurate heard an "ffrr" of this sort for some ropean Baroque with the grandly as well as beautifully shaped. It seems time-the continuity from the first slowed -down endings that were fash- to take one of Great Britain's respected days of ffrr, long before stereo, is ionable in the West 30 years ago. But "Sirs" to do this sort of thing for the amazing. Still the same rather loud, all this merely sets a kind of atmos- great classics - witness the absolutely steely strings, the even spacing of all phere. The playing is mostly very superb Beethoven Symphonies by Sir the instruments at a seemingly identi- YOU CAN TAKE IT WITH YOU! cal distance, the big, fat bass and the shiny treble, the ultra -clear semi -close- Quality Sound takes up instrumental colors, larger than life to the road ... the sky ...... Also, a very high effective level (if and the ocean! I am right, this is not entirely a matter of dB but, rather, a subjective effect, born of the microphone technique) and along with that, a lovely, quiet surface. Enough said! There are other schools of thought on recording, but this is one very fine way to put down a symphony orchestra. Manfred is not one of the easiest of Tchaikovsky's works. It is enormously lugubrious, sprawlingly big, an ele- phant -like partner to the much more LAB concise and intense Romeo and Juliet, LJJLJL1O LJLJ SERIES in are that both picture works, based We wrote the book on miniature speakers, from Design to on a "program." In Manfred Tchaikov- Production! Our five models speak for themselves in total sky works up the ominous, impend- performance, styling, and features that are found In no other ing -fate sort of music to its most ex- speakers ... such as, Solid Walnut Cabinetry, full 12 db crossover network, treme-and we tend all too easily, a specially designed cone with our exclusive rubber surround, and a deep throw speaker basket. These now, to lose contact. How long can are Just a few of the reasons why our Bass is unequaled in the you be forbiddingly ominous and Industry. "Dimension Minis' are Proven best by listening test." brooding about terrible things to Come in for a demonstration and judge for yourself. come? Not long, today! It took the big See and Hear the New Dimension in Sound of old masters of conducting, the practi- Your Local Stereo Dealer. tioners of high drama like Willem Mengelberg, Toscanini, even our re- DOLJLJMMIOuLI cent old friend, Stokowski, to maintain 819 S. Kraemer Placentia, CA 92670 any sort of real continuity and emo- (714) 630-5440 tional shape in a sprawler of this sort. Representative and Dealer Inquiries Welcome "The Ash Can" (as some have is 117 flightily called him) young and vig- Enter No. 13on Reader Service Card orous, and Russian, too-I speak, of course, of Ashkenazy. But there are many moments in this rendition when one senses that the musicians are play- Only ing the notes, just as written, and won- dering themselves what is going on. The Audio Critic They seem to flounder-the opening HELP! lugubriousness on side one is a drag. would dare. You may blame Tchaikovsky if you Anytime you have a question about your Can you imagine any audio publica- wish; nevertheless, I expect that the Audio subscription, AFFIX tion, either commercial or underground, conductors of a generation ago could please include a a amplifier have made this music go, along with mailing label to in- LABEL telling you that new integrated their own more understanding per- sure prompt service under $200 sounds unquestionably superior formers. It was their music, after all, of on your inquiry. HERE to many highly venerated preamp-power- amp combinations costing $2000 and more? their day. CHANGE But when, inevitably, things begin Only The Audio Critic would have the OF ADDRESS to get moving, the music comes to life integrity and self-confidence to take that along with the excellent Philharmonia. If you're about to credibility risk. Read all about it in the forth- This is no second-rate orchestra-on move, please let us coming Volume 2, Number 2 (the eighth know approximately issue since the start). side two, when the musical fireworks weeks before four a begin, it really opens up and plays. I'm the move comes ___! ___ At the other end of the spectrum, not suggesting that you begin with about. Or, if there is anything wrong with fairly simple new speaker system for $3500 side two; T. might turn in his grave at your current mailing label, please let us the pair is hailed in the same issue as the affix the thought. But hold on awhile, while know on this form also. Simply your reference standard replacing The Audio present label here, and carefully. print the previous "hybrid" reference side one plays its lugubrious way. That updated information below. Critic's will make side two so much the better, speaker costing incomparably more. As the community has come to especially with such an interesting re- PLEASE HELP US TO SERVE audio The Audio Critic is the only corded sound. Brilliant. YOU BETTER appreciate, totally noncommercial, ad -free, con- Those who know Symphonies No. 4 AUDIO MAGAZINE sumer -oriented audio review with a decent- and 5 will find remarkable remem- 401 N. Broad Street Phila., Pa. 19108 brances of those works here-not sur- ly equipped laboratory, merciless ears and an editorial mind unconfused about the laws prising, since Manfred comes right be- Name tween those well-known symphonies. (Please Print) of physics. You should probably start your Company subscription retroactively, with the sixth

Sound: A- Recording: A- Surfaces: A - Address issue (Vol. 1, No. 6), which is a cumulative reference work with over 150 reviews. Coty State Send $30 for 6 consecutive issues by AUDIO January 1980 AU 1/90_ first-class mail (no Canadian dollars, $6 extra for overseas airmail) to The Audio Critic, Box 392, Bronxville, N Y 10708. BIGGEST SAVINGS- SAME DAY DELIVERY Call TOLL FREE 800-638-8806 or, if busy, 301-488-9600

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Call TOLL FREE 800-638-8806, or, if busy, 301-488-9600 for information on equipment, prices and ordering, or send for free brochure, tips on buying hi-fi equipment by mail, test reports and a $2.00 merchandise certificate International -, Hi-Fi Distributors is Moravia Center I'm Old But I'm Awfully Tough: Tradi- though, so unflattering, it should Industrial Park, Dept. Al ate tional Music of the Ozark Region have been left out. Jake Hockemeyer's Baltimore, Maryland 21206 1001, contest -fiddling style me as 113 Missouri Friends of the Folk Arts strikes Enter No. 19 on Reader Service Card 2 discs, stereo, $10.50. more generally Midwestern than spe- The Ozark region of southern Miss- cifically Ozark. Vesta Johnson is a fine ouri and northern Arkansas has not fiddler with a sleek, polished style who lacked for documentation, but this set deserves more than just two short of recent field recordings suggests tunes. Frank Reed and Alva Lee Hen- there are many worthwhile performers dren are a supremely coordinated fid- in the area whom previous collectors dle -banjo duo; Hendren plays banjo in overlooked. an unusual up -picking style which Only one of the artists heard here sounds like frailing in reverse, so to has recorded before. Tip McKinney speak. was lead singer for Pope's Arkansas The most important items here are Mountaineers, who recorded for Vic- on side four, which is devoted to the tor in 1928. Though his voice is weath- music and cultural traditions of Old ered with age, he sings with feeling Mines, one of the last remaining and a great deal of dignity, especially French communities in Missouri. (The in the religious songs. Lawrence Baker, French were the first Europeans to set- who also performs unaccompanied, tle in the area.) It's worth noting that sings a few traditional nonsense songs, the frisky, jabbing, staccato -filled style a genre which seems to have survived of Charlie Pashia and Joe Politte differs hardily in the Ozarks. Green Berry considerably not only from Ozark fid- Horton's clawhammer banjo -playing dling, but also from the more promi- features a crisp, ringing melody line nent French survivals in North America which he fills in with a dancing fifth - (i.e., French Canadian and Cajun). string drone and distinctively full Along with the music, there are spo- chords. ken reminiscences and anecdotes by The dominant instrument in this set the performers. The enclosed booklet is, as you might expect, the fiddle. Em- includes biographical information, manuel Wood, given jumping rhythm notes on the tunes, and a lengthy es- guitar and bass support by his sons say on the settlement of Missouri. PLEASE RUSH MY and daughter, plays rough yet exciting However, this essay, while certainly in- versions of regional fiddle tunes which teresting, is of dubious relevance at FREE 1980 CATALOG deserve to be more widely known times to the music at hand. (Missouri (Dixie Blossom in particular). Troy Lee Friends of the Folks Arts, Box 307, New name plays a number of more familiar tunes Haven, Mo. 63068) Tom Bingham address in a comparatively smoother, more deliberate manner; his Kentucky Waltz, Sound: B Performance: B- to A city state zip

fßiliaELECTRONICS.neot.l- A 1020WWilsh,re. Oklahoma Gay. OK73116 a------J Enter No. 31 on Reader Service Card The Bramble & The Rose: Mary McCaslin and Jim Ringer Philo PH 1055, stereo, $7.98. Even though Mary McCaslin and Jim Ringer both rank among my personal favorites, I confess I approached their first duet album with misgivings. After all, the history of modern country music is overloaded with solo stars whose vinyl pairings have ranged from incon- sequential throwaways to unmitigated introducing... disasters. (To cite an obvious example, how many of Loretta Lynn and Con- The Bryston Preamp, Model 1B, long awaited by audio- way Twittÿ s chart -topping duets have philes, is a reality. had either the authority or validity of Employing novel, fundamentally correct signal - their individual hits?) As harmonious handling techniques, researched over a period total- as they may be offstage, I doubted ling several years, the Model. 1B sets new standards whether McCaslin and Ringer could for overall musical ease, accuracy and resolution. reconcile her neo-traditional Western The Bryston preamplifier is a statement of purpose, sensibilities with his laidback country - representing the same finality of design concept as folk approach. the Bryston line of power amplifiers. In a sense, McCaslin and Ringer we'll tell you have sidestepped the issue by playing Write to us today and more. it safe. Rather than stick their necks out by attempting to merge their styles, they've dipped into those sub - o o)o genres of country music in which duet 574 WESTMORE DR., REXOALE, ONTARIO, CANADA M9V 3Y6 TELEPHONE: 746-1800, CABLE BRYREXCAN and harmony singing have long been established (country -rock, gospel, bluegrass, the brother duos of the '30s, etc.). From these areas, they've chosen songs which could be easily adapted to a comfortable middle-of-the-road 119 country -folk format. Enter No. 10 on Reader Service Card But if the album is relatively safe, it is by no means superficial. The Ring- ers' selection of material digs below the threshold of instant recognizability to revive such under -exposed gems as The Dillards' Copperfields, West Coast HELP! singer -songwriter Jon Wilcox's Stages TZ/ of My Life, the traditional The Bramble Anytime you have a question about your and the Rose, and a Dakota Dave Hull Audio subscription, AFFIX arrangement of Oh Death. I can't say please include a the world would have been any poorer mailing label to in- LABEL without another version of Geronimo's sure prompt service on your inquiry. Cadillac, but Ringer's relaxed interpre- HERE tation paradoxically makes more sense CHANGE e than Michael Murphey's justifiably an- OF ADDRESS grier original. Perhaps the most _ unorthodox choice is Ray Charles' ol- If you're about to I: die Hit the Road Jack, which translates move, please let us know approximately to country unexpectedly well. four weeks before The singing throughout is leisurely, the move comes ____/ _ _ _ Thehandcrafted SpeakerlabT "`7°" reflective, and thoroughly listenable. about. Or, if there is anything wrong with Th'rties featuring the patented P,'sÿ. The instrument backing is as immacu- your current mailing label, please let us Nestorovic Woofer System are 1M; .-- know on this form also. Simply affix your unlike any speakers you've ever l_ .k_, late as would expect from you such present label here, and carefully print the heard. Find out aboutSpeakerlab's seasoned and compatible pros as Jay innovative speakers, kits, and raw updated information below. speakers. You can save up to 50% Ungar, Winnie Winston, Dick Fegy, when you build them yourself. Ken Bloom, and Billy Mundi. PLEASE HELP US TO SERVE Read about all the details in our There may not be many surprises YOU BETTER free catalog. Send for yours today! here, but it's certainly not a throwa- AUDIO MAGAZINE 117 way, either. Rather, it's a beautiful 401 N. Broad Street Phila., Pa. 19108 name record which should delight anyone address who loves McCaslin and Ringer sepa- Name rately. Tom Bingham (Please Print) city state Company zip Sound: A- Performance: A Address_ 4eoketki January 1980 City State _Zip cpt. 117, zii 5 N. Not thlake AUDIO AU 1/80 Seattle, Washington 98103 FOR SALE FOR SALE ABATE THE HIGH COST OF YOUR NEXT AUDIO PUR- AFFORDABLE ESOTERICA CLASSIFIED CHASE! Central N.Y. State DIRECT DISCOUNTS LTD. offers many of the finest lines of Audionics Apt -Holman Dahlquist Denon ADVERTISING audio gear from budget equipment to typically non -discount- Spectro-Acoustics Crystal Clear ed components and cartridges. 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Just call us at 212-254.3125 for available! Direct -to-tape Recordings offer the finest NON BUSINESS ADS -Situations Wanted, used equip- prices and information, or send $2.00 for our current bro- sound available only on reels, cassettes, & cartridges. ment for sale by private individuals $3.50 line. per First chure to Direct Discounts Ltd., P.O. Box 841, Cooper Station, Ampex video cassettes also available. WRITE for FREE line set in bold face type at no extra charge. Extra lines NY 10003. Shop with us by phone with your M/C or VISA. We brochure & current special offers. Direct -to-Tape Record- set in bold face type per line. $7.00 Full payment must ship worldwide! Foreign inquiries invited. ing Co., 14 Station Ave., Haddon Heights, NJ 08035. 2-0 accompany order. A BI-FET BREAKTHROUGH COMES TO DBX! Air Core Coils - bobbin wound. Crossovers and passive ele- FREQUENCY DISCOUNT -3 times, less 10%. 6 times, Your old DBX 117 or 119 can acquire the benefits of the new ments. Dealer pricing. 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For info. call 518-793.6639 Mon. to Marcof PPA -I, Meridian, Michaelson & Austin NA -I, Spendor, Fri. 11-9 Sat. 10-6. House of Hi-Fi, 50 Miller Rd. (Rt. 9), Glen Fried, Mordaunt-Short, Precedent Audio, Spatial Coherence, Falls, NY 12801. Van Alstine, Strelioff Systems, STD, Connoisseur, Rega Planar, Grace, Supex, Signet, Micro -Acoustics, NAD, AGI, Hadcock, CPU Micro -Tuner, Wild BE BEAT! Advent 300 owners - Upgrade with new modification. Dra. Bening FT -10 and many others. matic increase in bass response, improved midrange clarity SOUND BY SINGER AN ALTERNATIVE 1. Super Selection and openness. Instructions only $10.00, modification per- For information call or write: Sound by Singer, 227 Lexington 2. Strong Guarantee formed $85.00 Amoeba Systems. 712 S. Remington Rd., Ave., New York, NY 10016. (212) 683-0925. (10:00 ÁM- 3. Fast Delivery Bexley, Ohio 43209; 614-861.8710. 10:00 PM) We ship anywhere. 11-0 4. Full Warranty SUPERIOR AUDIO COMPONENTS: Audio Pulse; Audio Research SP-6 tube preamp and D-110 CALL 203-932-4265 amp; Badap 1; Celestion; Cizek; Crown Distinction Series DL -2, SA -2, and EQ-2; Dayton Wright; $1 Rebate for all orders over $50 dbx; Decca; Denon; Dynavector; EMT; Formula 4; Grace; Haller kits; KEF; Kenwood Purist: Lux LRS: Magneplanar; Mitsubishi: MAC VISA COD Mobile Fidelity records: Nakamichi; Plasmatronics: Polk; RTR: Verion: Watson speakers.

* AUDIO PEOPLE * 233(215)East Lan48casteror649 Wynnewood, Pa. 19096. 998 Orange Ave., West Haven. CT 06516 fCk1y 111111) ! ,, 667-30 Avenue2965., FOR SALE FOR SALE FOR SALE ATTENTION AUDIOPHILES: ANTI -SKATING for AR TURNTABLES!! Proven counter- ATTENTION SOUTHERN AUDIOPHILES SPECIAL OFFERING OF VERION PRODUCTS weight design of nickels steel & aluminum construction. In- Yamaha General Resistance, Inc., the ONLY Great American Sound manufacturer of Ver - stall yourself in minutes. $7.95 postpaid. (Dealer inquiries ion MK1 Stereo Pickup Transformers, Dahlquist Ortofon Triaxial Audio invited.) AUDIO INNOVATIONAL PRODUCTS, P.O. Box 1607, Polk Audio Denon Cables, and GS1 Ground Strips has been authorized by Portsmouth, N.H. 03801. Bang & Olafsen Klipsch Stipulation to sell the remaining inventory of those products: Advent Technics ARC SP6-A $1000, ARC D52B $1050, Mark Levinson ML -1 M&K Visonik MK1 Stereo Pickup Transformers (specify pickup with A cards & extra Lemos $1100, FR64's arm new $425, B- Aiwa Sonus impedance): $350 each, 60 stabilizer new $300, Grado 18 with Grace 714 $275, origi- Philips Maxell Triaxial Audio Cable pairs: $30 per one meter, plus $5 nal Black Widow $90, Denon AU -320 $100, Marcof 1h $120, Available at Sound Advice for each 1 meter added to the pair. All Triaxial cables Audio Stndrds MX10A $325, Linn Sondek $625. (315) 437- Village Plaza Ruston LA. 71270 (3181 255-8000). 9-9 have RCA -type connectors, at one end, and either bare 3357 days or 637-8119 eves. Syr., NY. leads, RCA -type connectors, or male or female DIN connectors at the other. Be sure to specify length and choice ARIZONA AUDIOPHILES Audio and TV tubes factory boxed, speakers, semiconduc- of connector. Dahlquist, S.A.E., Revox, Rabco, Nakamichi. Yamaha, Crown, tors-low prices, free price list. Transisleteronic Inc., 1365- GS1 silver-plated 12" solid copper Ground Strips with Grace, Stax, Tandberg, Sonab, Supex, Gale, Klipsch, Phase 39th St. Brooklyn, N.Y. 11218 212-633-2800 TF hardware and grounding pig -tail: $20 each. Linear, Uher, Burwen, J.B.L., Harmon-Kardon Citation, All above carry 5 -year manufacturer's warranty. A.D.S., Spectro Acoustics, Beveridge, Sennheiser, Teac, AUDIO BARGAINS - FREE UST. Closeout/bankruptcy Quantities are limited since there will be no further pro- Thorens, Stanton, Aiwa, Stax, Micro-Seiki, Fidelity -Research, specials. SCC, Box 8014 (A-79), Canton, Ohio 44711. TF duction. Genesis, Optonica, R.T.R., B&W, Toshiba, DBX, Signet, Mitsu- Send official bank check or postal money order immedi- bishi and Mitsubishi V.S.S. ately to avoid disappointment. Orders shipped prepaid JERRY'S AUDIO EXCHANGE AUDIO DEN AND POLK AUDIO UPS in the USA. Others add shipping. No telephone or PHOENIX-334 E. Camelback Rd. (602) 263.9410 The Audio Den is proud to have on display and demonstration dem accepted. TEMPE -130 E. University Dr. (602) 968-3491 the amazing Polk Audio Monitor Series. Our customers say

GENERAL RESISTANCE, INC. TUCSON-5750 E. Broadway. (602) 622-7407 "Fantastic! Compares with the finest loudspeakers I have 130 S. Columbus Ave. MAIL ORDER HOT LINE- MR. WOZ (602) 265-7841 heard. Probably the best value in the history of Audio!!!" TF Mt. Vernon, NY 10553 Audiograme, from the Audio Advisor said, "We were so impressed that we could not believe the prices ... Other $200 ASHELFORD SOUND goes NATIONAL! Top quality, origi- speakers simply do not come close to the standards set by nal, extremely efficient, proven speaker system kits for the the Model 10 ... And at their price, they are simply a steal." home cabinet constructor: From home to concertclass rock Come in for an audition or write us for information on Polk or ATTENTION DCM sound reinforcement. Catalog Free. 2646 Garfield Street, Lin- our other state-of-the-art products. Polk is shipped free in the TIME coln, NE 68502. WINDOW continental U.S. Audio Den Ltd. 1320.34 Stony Brook Rd., OWNERS Stonybrook L.I., N.Y. 11790, 516.751-3350. TF AT CUSTOM SOUND, we've spent more than two years We now offer a convenient and attractive way to im- developing the very best designed cabinet for housing prove the sound of your speakers. The DCM Time Win- stereo components. Before you invest in a rack or cabi- dow, when raised 9 inches off the ground, has an airier net send 254 (stamps O.K.) for our color brochure. Cus- and tighter sound: the image is raised and standing tom Sound, 8460 Marsh Road, Algonac, Mich. 48001. waves reduced. THE DCM TIME WINDOW PEDESTALS are made of 121 At Paragon of Sound: Berning TF10, Precision Fidelity C-4 heavy duty wrought iron and suit the shape and appear- and C-7, Conrad -Johnson preamps; MZ-Mod-3 and Panora- ance of the Time Window perfectly. They sell for $65. per ma, Rogers LS3/5A, Koss Electrostatic speakers; M&K Volks pair. If there is no dealer nearby, order postpaid (Master TDK 3M AGFA woofer, Fundamental Research subwoofers; Armstrong for free cassette catalog Charge & Visa accepted) from Call/write tuner, Berning tube crossover and Stereo 20 amp; Hadcock Polyline 312/298-5300 tonearm, Denon, Grace, Supex, Dynavector products; and 20 eirj' 1233 RAND RD. DES PLAINES, IL 80018 R. S. PARK AUDIO ASSOCIATES Monster Cable. Call 301.229.2676 (Bethesda, MD) or write 5 SUNRISE PLAZA, VALLEY STREAM, NY 11581 P.O. Box 189, Cabin John, MD 20731. (516) 561-7555 DEALER INQUIRIES INVITED

Audio Threshold's Sensible Sound System Vandersteen II Loudspeakers Electrocompaniet Amp Class A Electro Preamp Built in M.P. Incredible! Plus ESS Transar Grado, Phillips, S.M.E. Direct to Disc Records 36633 Gratiot, Mt. Clemens, MI 48043 (313) 791-1400 Come Closer to the Real Sound with KEF Speakers. You can Tel: 617-734-2727 Bob Heenan Sells Sound Advice now build the famous Great Used Boa 782 British KEF 104AB and Brookline Village Equipment MA 02147 Cantata Speakers in kit AR Mark Levinson GAS with up to dbx Magneplanar SME form savings KLH QUAD ESI. Denon 40%. Bose Rappaport Dynaco P.&W Bryston Thorens Advent LS3/5A Dahlquisl APT/Holman Hafler Nakamichi Bang & Olufsen JBL Marantz (tubes) "Hearing is Believing" Audio Research DB and much more audio den ltd. Equipment bought, sold, 1320-34 Stony Brook Rd. Stony Brook, New York 11790 traded & brokered (516) 751-3350 Money Back Guarantee AUDIO January 1980 FOR SALE FOR SALE FOR SALE

AUDIO DEN LTD. AUDIO FOR THE FOUR PAGE REPORT Long Island's leading audio store has on demonstration COMPONENTS CONNOISSEUR THE STATE OF THE ART ACOUSTAT AGI AUDIO PRO AUDIO Stan White. R°oñrenverstarker AUDIO RESEARCH ELECTRONICS TECHNICA BEDINI CLASS A BEVERIDGE HI FI Exklusiv (Germany 5/79) reports on Stan White, Inven- THE NEW SP6 TUBE PREAMP BEARD DRACO LABS DUNLOP SYS- tor of the GLASSCONETM speaker: "Stanley White der Kon- THE NEW D79 TUBE AMPLIFIER TEMDEK FIDELITY RESEARCH GRADO strukteur des vorliegenden Veteraned, zahlt neben Paul THE NEW SCHEIBER 4 CHANNEL DECODER HADCOCK HEGEMAN JANIS JR Klipsch, Saul Marantz and Avery Fisher zu den Wegbereitern THE NEW ACOUSTAT MONITOR III'S 149's & 150's MORDAUNT-SHORT der High Fidelity. Er baute neben einer Reihe von Vorund MARCOF MXR NAD POLK QUATRE THE NAKAMICHI 680 Motional Feedback RAPPAPORT SEQUERRA PYRAMID Endverstarkern den erten Hochtoner und -JOHNSON ELECTRONICS CONRAD SME SNELL SONUS STD SYMMETRY einige zu ihrer Zeit unter Audiophilen hochgeschatzte SIGNATURE CARTRIDGE GRADO THETA WIN LABS Lautsprecher wie den Mach I und den 4000 Mark teuren 4- FULTON CARTRIDGE AND TRANSFORMER D." Write TACHYON, P.O. Box 204, Bloomingdale, IL 60108. LINN-SONDEK PAUL HEATH AUDIO 10-0 (AUDIO CRAFT) ULTRA CRAFT UNI -PIVOT TONEARM 3047 W. Henrietta Rd. We also have the following lines, Connoisseur, Denon, Grace, Rochester, N.Y.14623 (716) AUDIONICS - NEW PRODUCTS Luxman, Magneplanar, Magnepan, Polk, Quad, Rogers, Sher- 424.4916 We have in stock the NEW RS -I preamp, CC -2, the IM- wood, Sonus, Thorens, Yamaha, the largest selection of Au- AUDIO HOUSE -FLINT MICHIGAN PROVED BT -2 and the INCREDIBLE BERNING BA -150. We diophile Recordings on Long Island. Mordaunt - Short Sound Concepts Watson Labs hope to have the NEW LK-1 turntable in the spring. Free ship- FREE "SET IN NY AREA UP" Audionics Rogers Symmetry ping in USA. World-wide shipping. Visa & M.C. honored. By UTILIZING IVIE SPECTRUM ANALYZER Linn Sondek Conrad -Johnson Theta appt. OXFORD AUDIO CONSULTANTS, Box 145, Oxford, OH COME IN WITH 2 RECORDS AND WE WILL DEMONSTRATE Bryston Marcof M & K 45056,513-523.3895. THE WORLDS FINEST RECORD CLEANING MACHINE BY Keith Monks Record Sleeves 100 for $20. Sample $1.00. KEITH MONKS. 4304 Brayan Dr., Swartz Creek, Michigan 48473 313-655- AUDIO PERFECTION AUDIO DEN LTD. 8639 by Appointment. TF MINNESOTA'S EXCLUSIVE 1320-34 Stony Brook Road MARK LEVINSON DEALER HAVING TROUBLE FINDING DIRECT-TO -DISC AND SOTA Stony Brook, New York 11790 Our other fine products include: RECORDINGS? WE HAVE THEM ALL. SEND FOR FREE 516-751-3350 Bryston Pyramid CATALOGUE. KNOT SO CHEAP RECORDS, 705 BIG G.A.S. 10-0 Cizek Grace BEND, DEPT. AM12, WEBSTER GROVES, MO 63119. Rega Cotter Janis R.H. Labs DCM Linn Sondek Snell Acoustics Denon Magneplanar Spendor STILL LOWER Eumig Marcof Sumo DISTORTION Fidelity Research Micro Seiki Threshold LOUDSPEAKER We also have available Haller products including the DH -200 The VMPS Super Tower minimum phase in limited supply. response loudspeaker system produces AUDIO PERFECTION under standard test conditions (1W "The Real Audio Store" 122 steady-state drive) no more than 0.5010 8714 2nd Avenue South THD from 22Hz-20kHz, five times less Bloomington, Minnesota 55420 than the best-and costliest-competi- 612-888-3224 tors of other manufacture..

Its unique multiband bass system with AUDIOPHILE RECORDS FOR BARGAIN-PHILES!!! integral 15" subwoofer, 15" lowbass and Save 20% to 40% on the 50 top titles we keep in stock. Free

12" midbass coupler in a slot -loaded, air- catalog - write: Super Sound Record Service; P.O. Box tight aperiodic enclosure is flat to 20Hz 411237, Chicago, IL 60641. Fast, personal service. 1.0 (-3d8). AUDIOPHILES! Direct -Disc, Digital, Mobil - Linearity and neutrality are unsurpassed Fidelity -All labels Low Prices Fast Service. Write for free catalog. Direct by the finest audiophile monitors. Discounters, 2245 New Hope Church Rd., Raleigh, NC A 180° angled front tweeter/super- 27604. 9.9 tweeter array plus top -firing mylar dome tweeter provide high levels of low -dis- AUDIO RESEARCH D100 -A 214-783-0661. 1.0 tortion treble in a periphonic dispersion AUDIO pattern which is extraordinarily pleasant RESEARCH SP-4A $500. TYMPANY 1 -DS $1000. JR to listen to. 1495 $350. ONKYO 4500 $275. ALSO NIKON CAMERA SYS- TEM. R.T. LOVAAS, P.O. Box 1272, FERNDALE, WASH. The Super Tower may be biamped with- 98248. out an external crossover, or operated full -range from as little as 20W/ch. AUDIO RESEARCH D-110 $1550, Technics EPA -100 Arm

Efficiency (102dB/1W/1m), power han- $225, Luxman PD -121 Turntable $225, Silent Watchman in- dling (350W rms), maximum undistorted fared burglar alarm $395. All mint. (612) 747-2755. output level (128d8/1m), dynamic range

and headroom are enormous. Audio Research SP5 $595. D-100 amp $625. Dynaco ST - Its cost is $799ea fully assembled 416 amp with C-100 power supply $675.901.754-3010. (optional with dealer) or $499ea in easy - to -assemble kit form. Audio Research D100 -B amplifier. Latest model, mint condition $1000. (301) 681-7462. For the demanding audiophile with high and a larger -than - quality electronics AUDIO STANDARDS MX -10A, unused, with guarantee card, average listening room: we think this is the $225, SP -3A-2 $375. CROWN 300A $450; (201) 246-0944 loudspeaker you've been waiting for. NJ. There are nine VMPS Minimum Phase Response loudspeaker systems priced from AUDIO STANDARDS CORP., MX -10A Pre-preamp, $150. $72ea (model 101b) to $1499 (the fabulous 7ft (415) 376.8305. tall Super Tower II in finishes, assembled). Kit prices plus shipping. "A-1 SOLUTION TO MC CART./PREAMP INTERFACE consider the MGT -1, a passive device with twin transformers in VMPS Audio Products, div. Itone Audio, 7301 Rockway, mu-meatal containers. bandwidth, 0, -1db 10 to OOKH 25, to EI Cerrito, California 94530, (415) 526-7084 22.5 volts out. $299 Amer. $340 Can. RWR Audio Ltd., Box 3080, Station D, Ottawa, Canada KIP 6H6 Or send for litera- DEALER AND REP INQUIRIES INVITED ture. FOR SALE FOR SALE FOR SALE

ATTENTION OHIO AND INDIANA AUDIOPHILES BADAP-1 with RT 60 option. Mint, List $5300. Best Offer. DYNACO/DYNAKIT: SCA-80Q/K, $97; PAT -5/A, $177; ST - 0/LC has STATE-OF-THE-ART components at reason- EVES. (714) 277.1024. 80/K, $67; PAT 4/K, $64. POSTPAID (U.S. only). Certified able prices. Precision Fidelity C7 check/mo, SCC, Box 8014, Canton, Ohio 44711. TF Audionics, Haller, BELLE IN WALNUT. CALL 205.556-1183 AFTER 6:00 PM. Vandersteen, Marcof, and many more. Write: 0/LC Audio, 1006 Berkshire Rd., Dayton. D.B. SYSTEMS DB IA and DB 2, Preamp and Power Ohio 45419 or call (513) 293-7287. (513) 298-9330. Supply BIG, SAFE, TWISTED X12 GAUGE SPEAKER WIRE 404 Now $399.00. Ship Anywhere in States Prepaid. Send certi- Free Ft. Keith per FT. COD O.K. Shipping 100 or more. Monks CONRAD -JOHNSON fied check or money order to Campus Hi-Fi, 106 Market St., Record Sleeves 100 for $20. Samples $1.00. Audio House, Manchester, NH Tube Preamp (revised version) and Tube Power Amp are 03101. 1-0 4304 Brayan Dr., Swartz Creek, Mich. 48473 313.655- available for your listening pleasure. Moderate price, excep- 86394670. TF ELECTRONIC CROSSOVERS ALL TYPES tional tube performance. At G -B Electronics (201) 427.8885 - Updated de- finitive booklet describes applications, how to improve for Appointment in Northern New Jersey. 1-0 speak- B & 0 USES "ANY" CARTRIDGE with standard mounting er systems; $5.00 postpaid, credited to first purchase. Hunt- centers after our modification kit or at factory. Effective mass CONRAD JOHNSON ington Electronics, Box 2009-A Huntington, Conn. 06484. 2.5 grams. Adjustable silicone damping. $199.00 with money CJ tube amps & pre -amps now at AUDIO SALON, 2227 back guarantee. JML Company, 39,000 Highway 128, Clover - ELECTRO -VOICE INTERFACE and Greenway Ave., Charlotte NC 28204 (704) 377-6590. SENTRY SPEAKER SYS- date, CA 95425. TF Shipped Pre-paid. TEMS, RAW SPEAKERS, AND PRO-MUSIC PRODUCTS. IM- PRESSIVE DISCOUNTS. PROMPT DELIVERY TO ALL U S A CROWN SX-724 TAPE DECK -excellent. $1200. Van AI- AND FOREIGN DESTINATIONS. (305) 462-1976. BRITISH AMERICAN SOUND - SOUTH CAROLINA'S only stine Model 2 Amp -excellent. $900. 304-422-1091. high-end store: Threshold, Rappaport, Qysonic, Snell, Sym- ESOTERIC COMPONENTS AT LOWEST PRICES. Free Ca- dex, Acoustat, Linn-Sondek, DAHLGUIST LP -1 CROSSOVER $200; KENWOOD GAS, KA, Spendor, B&W, Rega, LO7M (1) talog list. Over 200 labels. Fast, Knowledgeable Service. Audio Precedent, Audio, Sonus, Hafler, $250; QUATRE GC500 $600; DENON Grace, Supex, JR, and oth- DA309 TONEARM World, Box 7518, G.R., MI. 49510. 616-241-2994. 2-7 pm. ers. Special prices on used $100; ALL EXCELLENT 901-386-4019. components for demonstration M -F. Visa/Master. and on selected new equipment; e.g. NEW Mitch Cotter transformer + Sleeping Beauty Shibata $550. P.O. Pox 1247; DAVID HAFLER IS BACK! FERROGRAPH The man behind the original Dynakits is back with his own Charleston, SC 29402 (803)723-6025. AUDIO EQUIPMENT/RECORDER TEST SETS. FERROGRAPH company and a new state-of-the-art preamplifier at a bargain QUALITY DESIGNED FOR O.E.M.'S & SERVICE SHOPS. COM- price! Available as a KIT or CUSTOM ASSEMBLED by expertly BO UNIT MEASURES DISTORTION, FREQ. RESPONSE, BRITISH AND EUROPEAN EQUIPMENT DIRECT TO YOU. ... trained wirers each performance certified. For further de- - SIG/NOISE RATIO, CROSS TALK, WOW FLUTTER, DRIFT, Most quality makes of equipment available at advantageous & tails write or call AUDIOKIT-260 Old Country Road, Hicks- prices. For price list and price quotes send Reply ERASURE, I/P SENSITIVITY, OUTPUT POWER, GAIN (LOAD- international ville, N.Y. 11801 (516) 822.5749 IMP. MATCHING Coupon. Audio T, Dept. B, 190 West End Lane, London NW6 ED & UNLOADED), (BAL & UNBAL), WEIGHTING, ETC. RTS-2/ATU-1 COMBO UNIT AT $1319.00 1SQ, England. Phone 01-794-7848. Visitors welcome. 4-0 DAVID HAFLER PREAMP F.O.B., N.Y. (N.Y. RESIDENTS ADD APPROPRIATE SALES Now available at Audio Ltd. CAMPUS REPS FOR ESOTERIC EQUIPMENT TAX) DETAILS FROM HAMMOND INDUSTRIES INC., P.O. 115 N. Walnut, Champaign, 1161820 (217) 359-3774 We need campus reps immediately to sell esoteric as well as a BOX 6028, HUNTSVILLE, AL 35806, (205) 772-0251. 4-9 vast selection of major brands. We have an unusually high FORMULA 4 ALIGNMENT PROTRACTOR devised by Percy selection of high end equipment, excellent prices, and unique DAYTON-WRIGHT XG-8 Mk III SPEAKERS $2200 PR. Wilson M.A. enables correct setting up all tonearm/cartridge advertising program. CROWN M 600 MONO AMP $1300. THRESHOLD 400A AMP assemblies, measures tracking accuracy over entire disc. $10 AUDIO SYSTEMS II $700. RTR-ESRIS TWEETER $400 PR. 215-322-6350. Bills only. Includes reviews etc. Mayware Ltd., P.O. 123 200 WEST 57th STREET, Suite 1004 Box 58, New York, N.Y. 10019 Dayton Wright XG8 mk III speakers, Yamaha C-2 preamp. Edgware, Middx. HA8 9UH England. 4.0 9-0 All perfect. Offer. John Boland, 2009 Meadows Dr. N., Rich- FORMULA 4 MC-2C MOVING COIL CARTRIDGE The best land, WA 99352, 509-783.9038. transducer only $85 incl. Airmail. Literature $1 Bill. Dealer CARTRIDGES UP TO 70% OFF!! Enquiries invited. Mayware Ltd., 15 Heather Walk, Edgeware, DEMO & TRADE EQUIPMENT SALE: Crown IC 150A $295; DIRECT DISCOUNTS LTD. is now fully stocked with top -rated Middx. England. 2.0 Crown D150 $295; Luxman CL 35 III $395; SAE 2900 $395; phono cartridges at unbelievable prices. We feature ACUTEX, Acuphase T100 $529; Dayton Wright X-G8MK Ill $1895 pr.; ADC, DYNAVECTOR, EMPIRE, GRADO, MICRO ACOUSTICS, For Sale one pair Infinity Monitor's QLSI Tower Speakers. KLH 9 $795 pr., Luxman 3045 $595 pr.; (2) Mark Levinson ORTOFON, PICKERING, SHURE, SONUS, STANTON, et al. Excellent Condition, Rarely Used, $1800 pair or offer (1.414- Ml -1 $1850 each; Dayton Wright SPA $795; Infinity Quan- Specials this month include: ADC XLM Mk. 111-49.95; DYNA- 367.1079). tum 5 $495 pr.; Infinity Quantum 4 $595 pr. OVATION AU- VECTOR 10X-89.95; GRADO F3E+-27.95; SONUS BLUE DIO 6019 BROAD ST. MALL, PITTSBURGH, PA. 15206 (412) (gold) -89.95. All fact. fresh w/manuf. warranty. We also han- 441-4550. FRANK VAN ALSTINE HAS DONE IT AGAIN. All new ZERO dle several esoteric pick-ups at competitive prices. Please call SLEW INDUCED DISTORTION modifications for DYNACO and us at 212-254-3125 for more information or write to: DIRECT DESIGN ACOUSTICS DEMONSTRATED other equipment. Walt Jung is right of course, but he over- DISCOUNTS LTD., P.O. Box 841, COOPER STATION, NY NEW YORK AND NEW JERSEY looks a few things we have not, such as the small signal ef- 10003. TF All Models in Stock fects of RFI and the low frequency analogy to S. I. D., which Phone your "MUSIC MAN" for demo appointment relates to the time constant ratio between low frequency cut- CHARLOTTE, NC 212-463.1208 OR 518-621-2126 off and power supply stiffness after regulation (we can prove Audio Salon demonstrates selected audio products by ap- Custom Audio Systems Designed and Installed that DC coupled inputs guarantee high distortion at low f re- pointment only 3-9 pm daily. quencies) Our new mods guarantee zero T. I. M. and until you Fried Haller DIAMOND NEEDLES and Stereo Cartridges at Discount pric- hear an amp or preamp achieving this, you haven't heard es for Shure, Pickering, Tech- PS Audio Thorens Stanton, Empire, Grado, Audio anything yet. For example our all new SUPERPAS mod will nica and ADC. Send for free catalog. LYLE CARTRIDGES, SME (704) 377-6590 Grace outplay any other vacuum tube preamp and its only our Dept. A, Box 69, Kensington Station, Brooklyn New York Decca Supex fourth best preamp design. Write for our detailed explanation 11218. For fast service call toll free 800-221-0906. TF AUDIO SALON 2227 Greenway Avenue 28204 that may shake the world of high end audio. Prompt quotes & pre -paid shipping US & Canada 9-0 DV505 $285, SP3A $450. Want 8B, 7C. (616)683-6860. JENSENS STEREO SHOP 2202 RIVER HILLS DRIVE COMMONWEALTH LOUDSPEAKERS BURNSVILLE, MINN 55337 612-890-3517 1.0 DYNACO COMPONENTS/ACCESSORIES ST -416/A, Fine quality loudspeakers also drive units, walnut veneer cabi- - $639; SCA-50/A, $109; C -100/A $179; A-25 II speakers, nets, air core inductors, mylar capacitors, crossover net- @$77; ST-150/K, $169. Call for quotes on other Dyna mod- FRIED SPEAKER KITS works. Choose from famous manufacturers like: Decca, els. Add 5% shipping. COD's welcomed! Ohio residents: 4% Fried speakers are exceptional. We offer the ABSOLUTE low- Coles, Dalesford, Richard Allan, Jordan, Schackman, Rad- tax. SCC, Box 8014 (1179A), Canton, OH 44711 - (216) est price on Fried speaker kits. Selection includes: (1) raw ford, and more. Send $3.00 for design, reprints, plans and 452-6332. 1-0 speakers, crossovers, hardware and assembled enclosures, catalog (refundable with first purchase.): COMMONWEALTH (2) assembled enclosure ready for speaker & crossover ELECTRONICS, 300 N. Allen, Pasadena, CA 91106, (213) DYNACO WALNUT CABINETS dramatically improve attachment, and (3) custom built, finished complete speakers 793-5184. 11-0 appearance of Dynakits! Single, $19.95; Double $24.95. Post- ready to connect to your amp. We have ready for delivery models BII, C, D, 0, and the Super Monitor. All enclosures are CONNECTICUT: A.D.S., Advent, A.P.T. Holman Audio Pulse, paid. (Please specify models.) SCC, Box 8014 (1179A), Can- made from solid wood in Oak, Birch, or Walnut. Shipping is B&O, B.I.C., Carver, Citation, Dahlquist, D.C.M. Time Win- ton, OH 44711. 1-0 free on several models. AUDIO SALON, 2227 Greenway Ave., dows Epicure, Hafler Harman/Kardon, J.B.L., Mitsubishi, Charlotte, NC 28204 (704) 377.6590. Nakamichi, Ortofon, Phase Linear, Micro -Acoustics, N.A.D., DYNACO OD -1 ambience recovery unit (Hafler designed). Stax, Tandberg, Yamaha, Cizek, Sonus. Will ship prepaid. Amazing special realism without extra amplifier! Perfect gift. GOLD PLATED phono jacks $1.00, han- Sounds Incredible, 39 Federal Road, Brookfield, CT.,06804. $19.95 (kit); $24.95 (wired). Postpaid SCC, Box 8014 plugs 854 ea., $1.00 dling. Reference Audio, Box 368, Rindge, NH (203) 775.1122 -phone quotes only. TF (1179A), Canton, OH 44711. 1-0 03461. 2-0 AUDIO January 1980 FOR SALE FOR SALE FOR SALE

GRAPHIC EQUALIZER KIT-ONLY $100 PPD. G -B ELECTRONICS HAFLER: AMP AND PREAMP

Twelve bands/channel, 100dB S/N. Free info or send $2.50 On demonstration: Snell Acoustics Loudspeaker, Spen Audio Ltd 115 N. Walnut Champaign 11 61820 217359.3774. for instruction manual with Len Feldman's review and copy of dor, Symdex, Chartwell, J.R., Rogers LS3.5A, Richard 11-0 May 1978 RadioElectronics cover story. (Refundable with Allen, Threshold, Conrad -Johnson, Precedent Audio. purchase.) Symmetric Sound Systems, Dept. A, 912 Knob. Preamp, Hapi, Berning Leach, Linn.Sondek, STD, Con. HAFLER DH -101 PREAMP cone Place, Loveland, CO 80537. 4.0 noisseur, Denon, Supex, Promethean, Grace, Hadcock, We expect to be in stock on this exciting new preamp by Dec. Decca, Platter Pad, Spectra Mat, Monster Cable, K. 12th. Kit price is $199.95. Custom wired and tested, GREAT GRACE & SUPER SUPEX Monks Record and others. Cleaning GB Electronics, $299.95. Immediate prepaid prepaid shipment shipment via We have in stock the Grace 707MKII, 704, F -8L, F.9L, Linn P.O. Box 385, Hawthorne, NJ 427.8885 07506 (201) for UPS. THE AUDIBLE DIFFERENCE, 435 Tasso, Palo Alto, Cali- Mods for the 707MKII, the Supex SD -900E+ Improved & SD. appointment. Northern New Serving Jersey Since 1945. fornia 94301. (415) 3281081. TF 900MKII. Free shipping. Visa & M.C. honored. By appt. OX- 1-0 FORD AUDIO CONSULTANTS, Box 145, Oxford, OH 45056, HAFLER DH 200 AMPLIFIER 513.523.3895. GET ACQUAINTED WITH TRANSCENDENTAL AUDIO'S Write or call for quote. AUDIO SALON, 2227 Greenway Ave., line of exciting raw advanced speakers, many used in systems Charlotte, NC 28204 (704) 377.6590. Shipped prepaid. by Tangent, Plasmatronics, Symdex, DAC etc., Bextrene cone

models in 5" to 10" most w/magnet, voice coil layer & Igth. HAFLER HEADQUARTERS IN CANTON, OHIO - The Listen- options. Very neutral SD tweeters plus a fascinating new driv. ing Room, 1807 Cleveland Ave. NW. (216) 452.6332. TF CRITICAL er w/1.3 gms moving mass that "traces" signal detail like The Dennesen Soundtractor is a the best electrostatic headphones, will definitely spoil you. HAFLER IN THE SOUTH! new precision cartridge alignment Design & application assistance from our lab available to help In stock, the superb Hafler DH -101 preamp. Kit $199, factory tool which will correctly set you realize the dream system you are planning from mini assembled $299. New:DH.200 amp. Immediate free ship- cartridge overhang and offset monitors, satellites, car systems to sub woofers, X' over de- ping. Also Fried, Audionics, more. READ BROS, STEREO, 593 angle for maximum fidelity and signs & parts including Mylar caps up to 10uí. Your inquiries King St., Charleston, S.C. 29403 (803) 723.7276. 7.9 minimum distortion in thirty & orders receive our prompt attention, send $1.00 for litera- seconds. Based on the universally ture. Transcendental Audio, 6550 Indiana Street, Golden, CO HAFLER PREAMP CABINETS. Literature. GEOMETRIX, Box recognized Baerwald formulas, the 80401. Innovative components & designs in high -end audio. 612, Mexico, MO 65265 7.9 ingenious Soundtractor requires Polydax (Audaz), Decca, E.J. Jordan, Dalesford. 303/420/

no measurements, no charts, and 7356. HIGHEST QUALITY USED EQUIPMENT: Lux - no graphs to achieve optimum man 4000 amp, $1000; Yamaha C2 preamp, alignment with verified accuracy GET INTO BROADCASTING! Learn how to receive free $450; IMF Monitor mk III, $700 ea. Yamaha CR within 0.003': records, tapes, get an FCC broadcast license, start your own 3020, $1000; Audio Research SP3, $360; Quad station. Free details. "Broadcasting", Box 130-N5, Paradise, 303, $175; Genesis III spkrs, $360 pr.; Har- We believe that the Soundtractor man/Kardon 11, $200; SAE mk 1M CA 95969. Citation is the single most important preamp, $285; B&O 4002 t.t., $550; Harman/Kar- investment that the critical don Citation 17S, $285; Harman/Kardon ST8 tt, audiophile can make this year. HAFLER DOES IT AGAIN! $285; Crown SX 824, $1000; Braun TG 1000, $500; Nakamichi 1000, $680; Nakamichi 530, $35.00 prepaid and insured. The Hafler DH200 state of the art Amp, 101 preamp, and $550; Yamaha Cl, $1000. Yamaha B1, $1000; 102 head amp are now available at: Audio Research D 52B amp, $950, Yamaha Al 124 Personalized Audio amp, $485. Nova 723 Bound Brook Rd. Dunellen NJ 08812 eanS All used equipment guaranteed 90 days parts 749 middle neck road/great neck, ny 11024 (201)752.3883 and labor. Audio Consultants, Inc, 1014 Davis (516) 466-5674 1.0 Street, Evanton, II. 60201, (312) 864-9565

FINEST STATE OF THE ART AUDIO COMPONENTS American PRI VATE DEMONSTRATIONS Audiophile INTIMATE ATMOSPHERE CONSTANT PROOF THAT THERE IS NO REASON TO MORTGAGE recreates the performance YOUR HOME TO GET FINE SONIC PERFORMANCE in your home through the WE FEATURE: finest audio components AUDIONICS LUSTRE AUDIO INNOVATIONS MARCOF available. AUDIO STANDARDS MICRO SEIKI AUDIO TECHNOLOGY NAD MOVE ONE STEP CLOSER AUDIRE NEXUS AXIOM PRECISION FIDELITY TO THE CONCERT HALL CIZEK PREMIER DAYTON WRIGHT RAPPAPORT DCM SHURE DECCA SIGNET DENON SME GRACE SPICA HADCOCK STAX HAFLER STD H.A.P.I. SUPEX IMPULSE VANDERSTEEN 5 Sunrise Plaza Valley Stream, NY 11580 IVIE VPI JANIS WIN LABORATORIES 516/561-7114 REFERENCE AUDIOPHILE RECORDINGS ALL SHIPMENTS PREPAID AND INSURED 716 Madison Ave. FREE THROUGHOUT CONTINENTAL U.S. New York, NY 10021 master charge MASTER CHARGE & VISA ACCEPTED 212/751-9733 FOR SALE FOR SALE FOR SALE

HIGH -END AUDIO AT LOW LOW PRICES! Aiwa, Allison, Au- dio Pulse, Bose, DBX, Cizek, ESS, Luxman, Micro Seiki, SAE. HAVE AN AFFAIR INFINITY 2000A, GARRARD 401, 312-246-3557. Technics Pro and many more! All factory fresh with full warranty. For discount price call 212.254.3125. Or send $2.00 Listen to the PRECISION FIDELITY C7 tube preamplifier with INFINITY QLS-1 SPEAKERS, UNUSED, FACT. SEALED, for our catalogue and price list to DIRECT DISCOUNTS LTD, inncwative cascode circuitry. The real David against all the MANUF. 12/78, MIRROR IMAGE, INCREDIBLE BASS AND P.O. Box 841, Cooper Station, NY 10003. Goliaths. Let your ears as well as your pocketbook relax. State of the art affair at $499. SMOOTH Hi END. 1 PR ONLY, $1600 INCL. SHIPPING. CALL 206.575.1291 or 206.2827846. HIGH END MINT EQUIPMENT. Levinson ML -1 (latest) with PRECISION FIDELITY, 1169 E. CHESS DR., full selection of Lemo cables inc. special 30ft. pre to amp/ FOSTER CITY, CA, 94404 6.0 xover and Verion-Lemo phono cable $1600; Van Alstine dou- IVIE ELECTRONICS REAL TIME ANALYZERS, etc. Some ble 400 with 14 farad power supply (2 Dyna C-100) $1150; HI-FI ENTHUSIASTS WANTED!!! Earn more than just spare very slightly used demonstrators at discount. Full factory war- Grace 707 Mkll $150; Technics EPA 100 (new) Universal money in your spare time, We need campus representatives ranty. Money -back guarantee. JML Company, 39,000 High- Tone Arm with cont. var. VTA during play $400; Technics to sell name brand stereo components at discount prices in way 128, Cloverdale, CA 95425. Obsedian base for SP -10, inc. plate for EPA 100 $200; Quan. your area. No investment required. Serious inquiries only trum Electronics DM IV mono tube amps with new tubes & lab please. Contact: Mail Order Dept., K&L Sound Services Co., checked $1000/pr. DB 100Hz xover $150; Burwen DNF 75 N. Beacon St., Watertown, Mass. 02172 TF 1201 $150; Soundcraftsman 2212 $150; evenings after 7:00 Platter Pad and weekends (617) 927.5464. GOLDEN Polk Audio AUDIOPHILES' HIGH FIDELITY COMPONENTS! gramophone® Quatre Bose, Yamaha, Tandberg, Revox, Nakamichi, ADS, Rega How is it that the inefficient, noisy, distortion prone, archaic Denon, Allison, Hafler, B&O, Ohm, GAS, Genesis, Rog- Revox vacuum tube can retain any acceptance among serious ers, Crown, Lux, Infinity, Advent, SAE, Nikko, others. Audio Resch Grace Rogers audiophiles? Why do manufacturers, large & small still ex- Low, Low Prices! AUDIO AMERICA (Virginia) 804.793. Advent Grado Sig. Setton pend enormous creative energy in desigining and making 3820. Call today for Low Prices! ADS Haller Shure/SME tube equipment? Who cares? We do ... MR. AUDIO'S BI- Denon Hiroka Mat Signet MONTHLY expounds the gospel of tube equipment but not at INFRASONIC COMPENSATOR MODEL A Dynavector Ken wood Sonus the Electra Resch Linn Sondek Stax exclusion of all else. We concede to permit solid state MC Reduce Power Wasting Distortion Increase Clarity and Solidi- E.M T. Magneplanar Technics head amps, xovers, bass amps & the like in a music system. fy Bass. Steep Cut -Off, Self Contained, A/C Powered Active FMI (Fulton) Mitch Cotter Ultracraft The tenacity with which tubes cling in spite of advanced solid Filter Removes Harmful Sub -Sonic Energy from your Comp:). G.A.S. Nakamichi Wintec state technology is a mystery to some - but not to us. MR. nent Stereo System..55DB (Minimum) at 4 CPS. Only $54.95 AUDIO's BIMONTHLY 6 issues 1st class $15. Overseas 2858 W. Market St., Akron, Ohio 44313 Phone (216) 864-4411 - Postpaid. AUDIO - SPECTRICS, P.O. Box 4223, Yuma, AZ $18-P.O. Box 3022, Monterey, Ca. 93940. 85364. 1.0

THE NO -COMPROMISE APPROACH BY

AUDIONICS of Oregon 125

RS -1 REFERENCE STANDARD PREAMPLIFIER

ALL CLASS -A OPERATION ULTRA -TIGHT RIAA EQUALIZATION HEAVILY REGULATED POWER SUPPLY GOLD-PLATED INPUT/OUTPUT JACKS RE -PROOF AXIAL TILT CORRECTION-MAXIMIZES CARTRIDGE SEPARATION AND MINIMIZES CROSSTALK CARTRIDGE RESISTIVE AND BA -150 CAPACITIVE LOADING ANALOG-DIGITAL STEREO POWER AMPLIFIER HYBRID TUBE/SOLID STATE DESIGN C-MOS AUTO-BIASTM CONTROL CIRCUITRY USER -SELECTABLE NEGATIVE FEEDBACK LOW -POWER SELECTION SWITCH

AVAILABLE AT AMERICAN AUDIOPHILE 5 SUNRISE PLAZA 716 MADISON AVE. VALLEY STREAM, NY 11581 NEW YORK, NY 10021 (516) 561-7114 (212) 751-9733 master charge MASTER CHARGE & VISA ACCEPTED

AUDIO January 1980 FOR SALE FOR SALE FOR SALE

In Illinois: Audionics, Conrad -Johnson, Polk, Spendor, Rogers IT'S HAPPENING IN JACKSONVILLE! LAUGH AND THINK. The Hi-Fi Game: A board game of fun JR 149, Precedent, Rotel, Connoisseur, JSH, Hadcock, Linn- More definition and "Focus" with the "Glassmat." This rigid, and thought. $11.95 from Penijon Games, Box 2129, Mar- Sondek. SYSTEMATIC SOUND, 512 Bridge St., Rockton, III. but acoustically "Dead" disc replaces poorly defined rubber tinez, CA 94553. Dealer inquiries welcome, too.

61072 (815) 624-4902. 1-0 or felt turntable mats, just $29.95 Fulton Cables and Head - UNN SONDEK MAIM LINN MODIFICATIONS shell Leads Mitch Cotter's B/2 Turntable Isolation Platform - - We offer the remarkable Linn Sondek LP12, the superb Naim INVISIBLE HANGERS FOR ADS, Braun, Visonik/David and Phono Preamp Modules SAEC Tonearm Cables Hart- head amp, the detailed Linn Asak MC cartridge, the giant speakers. Pair $12.00, $1.00 postage. Plexiforms, 10161 ley's New High Definition Speaker Cable The New "King of killing Nairn NAC42/NAP110 preamp/amp, 45 rpm adapter, Gilbert Court, Iowa City, IA. 52240 The Mini Monitors" KEF 101 Lustre GST -801 Tonearm friction hinged dust cover & Linn mods for the Grace 707MkII. Supex SDX-1000/SDF1000 Hafler Fidelity Research Pre- By appt. Free shipping in the USA. OXFORD AUDIO CON- cedent/Berning Hybrid Preamp Denon DP -80 QUAD ESL SULTANTS, Box 145, Oxford, OH 45056, 513.523.3895. Reference: 2 QUADS/2 Pyramid Ribbons/2 Custom Hart- ley's/2 Custom Oak Frames, All Tube A & Class Amplification LOWEST DISCOUNT PRICES ANYWHERE on audio equip- available as a complete system of "Building ACTIVE - Blocks " - ment. All major brands discounted. Write for quotes, K&L Conrad QUAD 44 Johnson Special On Decca London Rib- Sound Services, 75 N. Beacon St., Watertown, Mass. 02172. ELECTRONIC bons Infinity 4.5 RS Pyramid Threshold Audionics - TF CROSSOVERS STAX B&O Grace LUX 3045 Tube Amps M&K Marcof DBX RH Labs Digital, Direct, & Remastered Discs Most LOWEST PRICES ON STEREO-ESOTERIC COMPONENTS Plug-in Butterworth (maximally flat) fil- Items Prepaid Call us for the latest in fine Audio House of & Tapes. Over 150 brands. Send # 10 SASE for quotes. Au- ters in 6 12 db., or 18 db., per octave db., Stereo, 8169 Arlington Exwy, Jax, FL 32211 (904) 724-4988. dio Unlimited, 401 Reynolds Circle, San Jose, CA 95112 attenuation, any frequency specified. (408) Filters flat beyond 100 KHz. 289-8875 1-6 Monday thru Thursday. JBL DELPHI EQUIP. CAB. OILED WALNUT, in metal MINT. $250. LX - Complete crossover attractive "LOWEST PRICES: BOSE, SAE, DBX, HAFLER, GRADO, cabinet with all terminations and regu- 5 X-OVERS $100 PR. 1 -DRK MAHOGANY HARTSFIELD CAB. ADVENT, TANDBERG, AND MORE. DYNAMIC SOUND, BOX lated power supply; ONLY $500. PR WALNUT NEW HARTSFIELD CAB OR INCL 168, STARKVILLE, MS 39759. (601) 323.0750." 1p.m.- COMPONENTS. ALL F.O.B. BRIGHTON MI. 1-313-229-7378 STEREO BI -AMP $139 9p.m. 4-0 Tri -amp, quad -amp, and monaural types JBL PARAGON STEREO SPEAKER SYSTEM, oiled walnut, Low Prices: Immaculate (Sealed Container) Dual 939 Cas- available at comparable prices. Other new, perfect; $3900.00. Call 203-929-5255 or write Box sette Deck $425. New Quad 405, 33, FM 3 $650. Available available features: Summer for "single 2009 Huntington, CT 06484. woofer" systems, Subsonic noise elimina- Separately. Also M&K Woofer $75. Call Mark 716-631-0758. or bass 1-0 tion filters supplied with without KENWOOD LO 7 M Mono amps - $500; Janis boost, level controls. W-1 Subwoofer with Janis Interphase xover/amp $700; Yamaha B-2 amp MARANTZ 150 TUNER W/3" OSCILLOSCOPE. MINT FOR OEM'S AND $495; Yamaha C-2 pre -amp - $425; Dynaco St. 416 Fac. wired CONDITION. INCLUDES CABINET. $350. (717) 824.3790. HOME ASSEMBLERS amp $450; Phase Linear 70011 amp - $660: Phase

3000 pre -A - $425; Phase 5000 TNR - $425; Soundcraftsmen 500 Series dual filters and/or plug-in fil- Marantz 250M Ute use. Not working. Orig. cart. Best off. PE-2217-R pre -A - $420. All Demo or used with warranties. ters, regulated power supplies. (215) 279-3084 Days. FREE CATALOG & PRICE SHEET Sound Solutions, 190 Front St., Marietta, OH 45750. 614- 373-8486. Write to: MARANTZ 33 PREAMPS (2) $195. ea. MARANTZ 16B Amp /}J /// 100 W/Channel $225. Marantz 250 Amp. $325. Garrard Mu- 126 G`¡1O4adeey ENGINEERING LABORATORY KIT BUILDERS SPECIAL sic Recovery Module, New $90. All items perfect condition. Hafler pre -amp & amp/Fried's BII speakers. All in kit form. Ctns. Pvt. 609 455-6627. 11828 Jefferson BI.Culver City, CA 90230 Phone: (213) 397-9668 Specially priced package. AUDIO SALON, 2227 Greenway Ave., Charlotte, NC (704) 377.6590. Shipped Pre -paid. MARANTZ 7C, 9, McINTOSH C22, MC275, MC240. J. Fong, 1238 Green St., San Fran., CA 94109. (415)885-0596. 7.0

MARK LEVINSON ML-2 CLASS A AMPLIFIERS IN MINT CON- DITION. GARLAND AUDIO (408) 244-6724. 2-0

McIntosh MC275 amp, tube cover, original manual, You can pay $5.00 for an advanced schematics $1000, C20 preamp $375, new Denon 103d cart. state-of-the-art 60 minute cassette. $150, SME II $50, Thorens TD124 $50, 603-224.6721. McINTOSH MX110, MC240, MC275. Want old JBL's. 2675 Why? Larksong will sell you Coldsprings, Xenia, OH 45385. (513)429-9586. METRO-NEW YORK CITY one for $1.30 or less:' G.A.S., FR, Dahlquist, B&O, Lux, Linn Sondek, AVID, Janis, Baure & Wilkens, Grace, Tangent, R.H. Labs, Direct Discs, Grado, many others. All issues of Absolute Sound. * Pure Micro -Acicular Ferric Oxide UNIVERSITY STEREO -Ridgewood, N.J., * Fully Bias and Equalization Compatible 57 E. Ridgewood Ave -(201) 447-5700 20 minutes from G.W. Bridge 12-9 * Five Screw Case MILWAUKEE! - The Audio Emporium: Audio Perfection * Outstanding Signal to Noise Ratio Cables, Audiopulse, Audio Research, B&O, Connoisseur, * Lifetime Guaranteed Dahlquist, Denon, Genesis, Grace, Grado, GAS, Hafler, Linn, Lux, Magnepan, Marcof, New Acoustic Dimension, Polk Audio, RH Labs, Revox, Rogers, Snell Acoustics, Sonus, Treat a your hungry power-packed tape machine to Larksong cassette and Sumo, Technics and Threshold. Over 100 direct discs and the get a lot more entertainment for your money. No longer does its Keith Monks record cleaning machine. 6900 W. Brown Deer thirst for quality cassettes need to be limited by your lean budget. Rd. Open Tues. Wed. Fri. Sat. 10-6, Thurs. 10-8. Closed Now you afford the best - Larksong. One top line of exceptional Sun.& Mon. (414)354-5082. cassettes available in two styles of boxes. * Dollar Special - MILWAUKEE & WISCONSIN'S Your first Larksong C-60 cassette with complete tape ONLY TRUE AUDIOPHILE DEALER specifications and postage -free order blank for only $1. Limit Specialists in components by; G.A.S., Yamaha, KEF, Tand - it one per customer. Larksong puts all together so you get berg, Dahlquist, DCM, Fried, Quatre, Stax, SAE, Connoisseur, 10m music ot. Larksong, Transcriptors, Grace, Nakamichi, Infinity, Dynaco, Crown, r 10 Scotte St., Point Arena, CADe995468. Ortofon, Sonus, AX, Hafler, DBX, Akai, Teac, Revox, MXR, Technics and many many more. Featuring a very unique WHOLESALE INQUIRIES INVITED switching system for instant component comparisons. Also, one of the largest tape recorder displays in the country, with The Real tape breakthrough you've waited for. over 130 machines on display. WACK ELECTRONICS, INC. 5722 W. NORTH AVE. MILWAUKEE, WI. 53208. PHONE: 414-442.3441 TF FOR SALE FOR SALE FOR SALE

MIXER made especially for tape duplication. Will produce en- PERFECTIONISTS PREFER DYNAKITS RECORDS/TAPES. Major labels, top names at distributor hanced high quality second generation tapes. KUHN ELEC- Before Purchase You Owe Yourself Our Quote Mainline Ila, prices. All categories. Complete set of catalogs $1.00 (re- TRONICS, 1801 Mills Ave., Norwood, OH 45212. TF 971 Fronheiser, Johnstown, PA 15902 TF fundable) Box 1111, Chatsworth, Calif. 91311.

MUSICIANS, SAVE MONEY, TIME, TROUBLE. BEFORE POLYDAX (AUDAX) Bextrenes, soft domes etc., Decca Rib- REINFORCEMENT, RECORDING DISCO equipment featur- YOU INVEST IN EQUIPMENT. SPEND $5.00 FIRST AND bon tweeters Leach Amplifiers. Catalog: TA Box 97A, W. ing Electro -Voice, Tapco, Numark, Whirlwind, etc. Competi- SAVE. SEND TO: JHA ENTERPRISES, P.O. BOX 1128, BAT- Cornwall CT. 06796. Postage now 406, please help with tive prices with fast competent mail order service is our spe- TLE CREEK, MICHIGAN 49016. stamps. 9-8 cialty. Write or call SONIX CO., Dept. A, Box 58, Indian Head, MD 20640, (301) 753.6432. 10.0 Nakamichi 1000 MKII $1100, Audio Research SP -4A Pream- PROPER TONEARM GEOMETRY!! Optimum offset angle, plifier with optional Head Amp MCP -1 $795. Harry Lawson, overhang, vertical pivot height and angle. Resonance damp- 3801 Hogue Rd., Evansville, IN 47712. (812)422-5851. 2-0 ing construction. Jewelled pivots. Height adjustable while &SINGER'S DREAM! playing records. Effective mass 2.5 grams. Damped cueing. - . _. ...-n r------.r NAKAMICHI 700, original, excellent condition w/original Anti -skate bias. TA -3A with silicone damping, $249.00, pkg. carton, $750 or best offer. SOUNDCRAFTSMEN RP2212 "Universal" nylon hardware, $1.00; alignment protractor, equalizer w/LEDs $200 with case. 713.784.0731 before 7 $3.00. Prices include postage and money -back guarantee. REMOVES VOCAL FROM MOST STEREO DISCS The Thompson Vocal Eliminator can actually remove most or p.m. CST. JML Company, 39,000 Highway 128, Cloverdale, CA 95425 virtually. all of a solo vocalist from a standard stereo record and TF yet leave most of the background music untouched! Not an NEW AMPEX MASTERING TAPE 406 (7") 2.25, 407 (7") equalizer! We can prove it works over the phone. Write for a brochure and demo record below. COST: $249.00 3.25 New Scotch or Ampex LN -HO 1200x7 1.50, 1800x7 PROTECT YOUR LPs. POLY SLEEVES FOR JACKET 10', 2.25, 4000x10 5.00 min. 20 pp. all boxed. New type 10" ROUND BOTTOM INNER SLEEVES 9', SQUARE BOTTOMS metal Reels Boxed $4 min. 10 pp. other tapes Avail. Large 6', POLY LINED PAPER SLEEVES 15', white jackets 35', YOU SHOULD SEE US SASE for Details. MIS, 2514 Seaboard Ave., SJ, CA 95131 POSTAGE $1.50. HOUSE OF RECORDS, HILLBURN, NEW 408.262-8793. YORK, 10931. TF For: Delay and Ambience NEW DV/KARAT-RUBY and DV/KARAT DIAMOND PS AUDIO Studio Echo/Reverb now available Dynavector moving coil cartridges: very The PS III Pre -amp & Amp combination is a real Giant Killer. stiff, very small (2.5mm), undamped cantilevers flat Tape Noise Reduction - Check it out. AUDIO SALON, 2227 Greenway Ave., Charlotte, Parametric Equalization response to 50kHx. Also available, the Mk II versions of NC 28204 (704) 377-6590. Shipped Pre -paid. the renowned 20A & 2013 high-outout moving coils with Electronic Crossovers 3.6mv output, high compliance, and flat, peak -free, re- FULTON-FMI PLUS REGA PLANAR Comp/Limiters sponse. To order or for information call or write. (617) TURNTABLES Mic Preamp/Mixers ...R1..'t..te'e. 874.0706, mon-fri, 6.8 pm, (ask for Dick). AUDIO CALI- Now in the Washington -Baltimore area. Featur- Patch Bays BRATION, Box 250, Westminster, MASS 01473. ing the fabulous FULTON Premiere, Nuance, We manufacture a full line of high quality audio and recording 100 and 80 speakers, cables and cartridge. the equipment. You will probably have to pay twice as much REGA Planars are among the very few correct- elsewhere to obtain comparable quality. Only Direct Sales make New or Used Elecsets. State type, Number and Price. After prices $1 for a brochure ly designed turntables that actually contribute our and quality possible. Send 20 page 5- 919-876-0645. and 20 minute demonstration record. to quality of music but sell at a reasonable Write to: LT Sound, Dept. AU, P.O. Box 729, price. Personal service. Free shipping. Hours Decatur, GA 30031. (404) 284-5155 NORTHERN CALIFORNIANS by appointment. PAIDE ELECTRONICS, 1805 It is our goal to make the joy of music possible for everyone. Alcan, Silver Spring, Md. 20902. Call (301) 127 At any price we offer solid value, superior performance, and 681-7462 evenings and weekends. traditional service. We operate on the theory that you as our customer will achieve the greatest long term satisfaction only through a careful analysis of your audio requirements. We strive to offer GET IT TOGETHER... sober, highly cost effective solutions to meet your specific needs. Please stop in for a refreshing experience with music. with a OUR SELECTION INCLUDES: Magnepan Audioics Dahlquist Speaker Kit Tandberg Threshold Chartwell Onkyo Audire B&W JVC Haller Cizek AKG P.S.E. AVID Denon Lux Stanton Micro Grado Sig. AIWA Connoisseur Sonus M&K Soundcraftsmen Grace Rogers

HIGH FIDELITY SHOPPE 1511 North Main Street Walnut Creek, Calif. 94596 (415) 932.2242 "WE BUILD BETTER SYSTEMS FOR YOU"

Northern N.J.'e finest store -Lux, Mod DQ-10, Grace, B&W, G.A.S. Sleeping Beauty, FR, B&0, Linn, Sondek, Janis, Tan- gent, R.H. Labs, Grado, AVID and more. University Stereo, 57 E. Ridgewood Ave., Ridgewood, N.J. 07450. 20 minutes from the G.W. Bridge. 201.447-5700. TF

NORTHWEST! The Tin Ear. Audio Research, Audionics, B&W, Grado, LUX, Magnepan, Polk Audio, RH Labs, Rogers, Supex, Technics, Yamaha and Audiophile recordings. 704 Symons, Richland, WA 99352, 509.946-4459. 9-0

OVERSTOCKED, MUST GO Phase Linear 400 II Power Amp SEAS SPEAKER KITS use $395, 4000 Pre -amp, $399, 5000 II Tuner $399, Pioneer the finest Scandinavian dryers in computer optimized three-way designs. from 2 Power Amp $539, RT 1011 10" Open Reel $399, CTF Spec $59.00. For literature and information on SEAS Speaker Kits, raw drivers, A 1000 Cassette Deck $399, TEAC 3340SX $849, A2340 and crossover networks. send S l.00 (refundable upon purchase) to: $499, AR 1011 Speakers $279 ea. Acoustat X 1495 Pr. ALL

NEW FACTORY WARRANTY. Used SAE MK I Pre -Amp $249, THE SPEAKER WORKS MK II Power Amp $299. OTHER GOOD DEALS, WRITE OR Box 303 CALL: STEREO CLEARANCE HOUSE, 1029 Jacoby St., Johns- Canaan, N.H. 03741 Dealer Inquiries Invited town, PA 15902. (814) 536-1611. p:1-0, (603-523-7389) AUDIO January 1980 HOW TO SAVE A SMALL FORTUNE FOR SALE FOR SALE RAPPAPORT PRE-1 $475, Citation 16 $410, AR.5 spkrs. & STATE OF THE ART IN N. CALIFORNIA MA.1 twtrs. $225. 302.368.9854. 2.0 is now on demonstration at The Audible Difference. Hear the Buy the new superb Threshold NS -10 preamp/400A power amp through RECORDS can sound more like the master tapes that Dick Sequerra's stunning Metronome loudspeakers. Audition Fried Super made them with a DYNAVECTOR moving -coil cartridge. Peter Snell's superb Snell Acoustics Type A loudspeaker sys. Monitors in The new 20A Type -2 has a high 3.6mV output & requires tem with Threshold's new medium power CAS-1 amplifier. For no degrading step-up device, weighs a mere 5.3 grams the ultimate in high -power amplification, audition the Thresh. Inexpensive & has a very high compliance of 24X10 ". A bargain at old 8000A mono amplifiers. Hear how good a bi -amp system Kit form $230, UPS -COD shipping included. Satisfaction guaran. can be with John Curl's new transient perfect crossover from teed or your money back. Literature free upon request. Symmetry, the ACS -1, plus Paragon's 125 watt solid state Most of us have wasted a good deal of ALLEGRO SOUND, home of the evolutionary Gold Aero/ bass amp. Experience the beautiful new Paragon 12A money by buying loudspeakers that are ALLEGRO B Series audiophile tubes, 15015 Ventura preamp, plus Thaedra II from G.A.S. initially impressive - only to discover that Blvd., Sherman Oaks, CA 91403. (213) 766.9101 9.12 Hear the ultimate direct drive turntable, the Denon DP. theydrive us up a wall after living with them am. 6000, plus the audiophile reference Linn Sondek with Linn- for a few months. What happened to the modified Grace 707 tonearm. Examine the precisely ma- throaty sob of the soloist? Where did the RENOUNCE ROTTEN RECORDINGS! chined bearing of the new glass platter, belt drive Planar ta- high impact bass of the orchestra go? Read selected British reviews in the bi -monthly bles from Rega Research. Hear the ultra -musical Paragon Why are the violas lost among the violins? EURO.DISC GAZETTE, then order these European System E preamp, plus the new high performance, moderate Where is the recording hall ambience? So discs judged the finest in technical and musi cost Thalia/grandson combination from G.A.S. Audition we sell our "old" speakers and resume the cal excellence. Selections mainly classical. Send for free sam- a new generation of compact high performance loudspeakers quest. ple issue. No obligation. EURO.DISC GAZETTE, PO Box 337. from Polk and Cizek, plus BBC A, Peterborough, NH 03458. TF minimonitors from Spendor It doesn't have to be that way. The new and Rogers. For the music listener who demands the best, we Fried Super Monitor System will break the ROGERS REFERENCE MONITOR SYSTEM offer the Breuer Dynamic Tonearm, plus the EMT cartridge cycle for you. Rather than the "tinsel and This is a biamped system designed by Rogers using the in. with Verion transformer. glitter" offered by most speaker systems, credible LS3/5a's. Hear this system well For that extra measure of sonic purity so important to the the Super Monitor is designed for utter as as the Rogers Monitor II's, critical audiophile, we recommend and stock Polk neutrality firmly in the English tradition, Compact Monitor's, A100 amp and T75 tuner. Sound - Cables; Mogami wire; as the other less expensive Fried By appt. Free shipping. Visa & M.C. honored. OXFORD AUDIO the anti -resonant Platter Pad, $24.95; speakers. CONSULTANTS, Box 145, Oxford, OH 45056, 513523.3895 Audio Perfection audio interconnect low capacitance cables, $15/pr; plus the Stylift at $19.95 and a wide selection of There's no tinkly treble, forward midrange SACRIFICE MUST SELL SME 3009 SII! TONEARM audiophile quality recordings including Gale Maximum, Fidel'. or boomy bass to be found here. What you - - ($125), SHURE V-15 IV CARTRIDGE ($150). BOTH BRAND ty and Denon PCM. will find is neutral, uncolored, seamlessly NEW- NEVER OUT OF BOX. CALL MIKE 919.893-4885 AF- We ship all products prepaid throughout integrated sound. The advanced slow the United States. TER 6 P.M. THE AUDIBLE slope crossover utilizes the very finest DIFFERENCE 435 Tasso, Palo Alto, CA 94301 components. The advanced crossover is SAE 2300 150/ch. 1 Year Old. Transferable Warranty $600 in a compensating configuration (415) 328.1081 that allows or Best Offer. 703 569.3539 No. VA. all of the recorded information to be TF reproduced, including recording hall Ortofon MC20 + MCA78 $225 SAVE UP TO 89% ON OVER 100 TOP BRAND AUDIO COM- ambience (the downfall of many or b/o. ERA Mk 6c with SME other PONENTS FROM CARSTON NEW 128 systems pretending to greatness). II $175.206.329.1494. STUDIOS. ENGLAND'S AU- DIO SUPERMARKET ONE OF THE OLDEST MAIL ORDER The Super Monitor System is made up of FIRMS (EST 1952) AND CERTAINLY ONE OF THE MOST Fried's C Pyramid mini monitors used RELIABLE. ALL ORDERS SHIPPED FROM STOCKED WARE- with Fried's Super Subwoofer: Rdd0em HOUSE. SEND FOR PRICE QUOTE AND PRICE LIST. CARS - The Model C Pyramid houses a newly TON STUDIOS, OLD BROOKFIELD ROAD, DANBURY, CONN. developed 61/2", high -force -factor Bextrene 06`84e` 06810. TF woofer/midrange. It yields far better bass Oe,e, ,pc`,oÇeO`°òa'S' extension than the more common 5" unit SEAS SPEAKER COMPONENTS. Raw Drivers, crossover in used other currently popular mini - e+ °D`° o°r networks, speaker kits and more! Drivers and plans for mini monitors. The 1" soft dome tweeter ' cA 4,dIàr°0or41`6 kit and subwoofer kit. For information and literature combines silk -smooth response far 5 c° a send $1 o6.p ce refundable upon purchase to: beyond audibility with virtually unlimited ele4rpmoy,3 e° The Speaker Works power handling capacity. The C's, whether ese' ``+ r° 0é' c' ° Dept A used alone or as the upper portion of the p, a.,,m a s Super Monitor System, are simply superb e40r°`° 0ar0° Box 303 C+p Canaan, NH speakers - the finest in their class. tp0t es' e°a°cc 03741 The Super Subwoofer is the latest in oso4;ti`r Ji ,pès the long line of world famous Fried SIEMENS, TELEFUNKEN, GENALEX AND AMPEREX and transmission line designs. It uses a new other top quality audio tubes available very Fried-designed 12" Bextrene woofer which +4 at competitive S prices. Contact Jim Wallace at 1203 Success St., Pittsburg, achieves far greater transient accuracy in e' PA 15212 or (412) 322.4706 the crucial 20-50 Hz region than previous TF Fried subwoofers. If you seek increased dynamic range and a higher output of uncolored bass,the Super Sub is for you. Now, SONIKIT makes these Fried monitors available in easy -to -assemble AT SOUND COMPONENTS, INC kit form at great savings over the pre - assembled price: WE'VE fiOT IT Assembled Complete Klt Savings A« Model Price Each Price Each Per Pair Audionics Bang & C Pyramid $ 450 $340 $ 220 .... Olufsen ....Beveridge Cylindrical .... Bryston

Soper Sub $1550 . . $595 $1910 ...DCM... Denon ...Dynavector Fidelity Research... Fulton .. . These kits are complete with genuine walnut veneer side panels. Grace ...Great American Sound... Hafler . . H.Q.D. Reference System Send for complete details now - use the coupon below ------, ...Janis... KEF... Kenwood Purist ...Linn Sondek... Magnepan .. . Mark Levinson Paragon Pyramid Metronome Rega E hespeokzrsoecbfsts ...... Quad ... _1 173B - 65th Street ... Rogers ... Sonex ... Spendor ... Stax... Verion ... Yamaha .. . ICILOakland,CA 94608 Master Charge & Visa accepted We ship prepaid within U S Pease se'ia free Fried Brochure - Al8 SOUND COMPONENTS, INC. Name 2710 Ponce de Leon Blvd., Coral Gables, Fla. 33134 I Address (305) 446-1659

%City State Zip H&H INTERNATIONAL FOR SALE FOR SALE NEWSLETTERR SNELL ACOUSTIC LOUDSPEAKER SOUND STORAGE RESEARCH LIMITED New Products from H&H We have on demonstration this superb full.range speaker sys is pleased to announce its first record release, a spirited per. tern now bi-amped with the Snell Active Crossover and the formante by the San Francisco Trio of Brahms' Piano Trio JR 150 LOUDSPEAKERS extraordinary Threshold electronics. A marvelous listening ex- No. 2, Op. 87. The long awaited JR 150 loudspeaker Is perience awaits you. At G -B Electronics (201) 427.8885 for now appointment in Northern New Jersey. 1.0 To capture this music SSR Ltd. used the only two -microphone available and is receiving an excellent arrangement capable of preserving the original: response both here and abroad. It will play SNELL ACOUSTICS MODEL A SPEAKERS $795. Technics spatial balance (depth); approximately twice as loud as the JR 149 SP -10 $295. Larry Hunsicker, HHSR, Margaretville, NY reverberation patterns (ambience); or the LS 3/5A and is much more efficient. 12455.914.586.3161. instrument timbre (detail). The workmanship and design are impec- The result is a stereo disc containing the information neces- cable. The speakers will retail for $825.00 sary to reconstruct the sound in a coherent field which is per pair. Attractive chrome or black stands ! ! ! SALE! uniformly spread between and beyond the arc of the are available. TWO FOR LESS THAN THE PRICE Now you OF ONE. can buy loudspeakers. In order to preserve this information and dy DUNLOP SYSTEMDEK 2 SPEED two fine RCA (Japan) direct to disc records, Beethoven's ap- namic range the entire recording and mastering chain was TRANSCRIPTION TURNTABLE passionata and Lew Tabackin quartet's trackin' for only transformerless and the absolute phase is non -inverted. The SYSTEMDEK is designed with advanc- $11.95 including postage. That's right. Two records for Required processing followed: ed acoustic and engineering innovations $11.95! Rated as reference recordings in the Absolute Sound 1/2 -speed mastering at the JVC Cutting Center; that make it, quite simply, one of the best & Stereophile, these records retail for $30 for both. Hurry, immediate plating by Sheffield Labs; platforms for disc reproduction yet devis- supply limited. Send check or money order to: Specs Corp., pressing virgin vinyl Record Technology. on at ed. 130 Fallen Leaf Drive, Hillsborough, Calif. 94010 CA resi The plinth incorporates six highly damped dents add Sales tax. 2.0 a repro. Each 3315 record, including technical paper on sound acoustic barriers, which are specially duction, is available from audiophile dealers or can be or- designed to eliminate the effects of vibra- SAVE UP TO 40% ON DIRECT DISCS dered directly from SSR Ltd. for $13. postage paid; outside PCM, and Japa- tion and acoustic interference. Select from over 250 different direct discs, North America: $18. US sent by air. Send The turntable is finished in an attractive nese Audiophile records. Over 30 labels to choose from, SPECIAL ORDER: For equipment evaluation, a limited num- Dynamic black and aluminum "Pagoda" styling. $1 for complete list and prices. ($2 outside U.S.) ber of packages are available, consisting of a one-sided 1.0 A bush bearing that pumps oll and Discs, P.O. Box 0, Tarzana, CA 91356. record and a one-to-one open reel copy, made to your specifi- unique cations, of the master. Both contain reference level tones so eliminates metal contact, thus eliminating SOUND COMPONENTS INC. that accurate adjustments and comparisons are possible. friction and rumble, is part of the DUNLOP EXCLUSIVE SOUTHEAST design philosophy. The precision 10mm DEALER FOR THE SOUND STORAGE RESEARCH LIMITED stainless steel spindle is recessed to ac- INCOMPARABLE 166 Homestead Boulevard cept an 8mm ball thrust bearing which is MARK LEVINSON H.Q.D. Mill Valley, California 94941 seated in a self lubricating PTFE cup. The REFERENCE SYSTEM 415 383.2824 101/2 Ib. (4.7 Kg) aluminum platter is in- i The H.Q.D. reference playback system consists of the follow- dividually balanced and is belt driven from ing components: SOUND TECHNOLOGY 17006 W/Auto Level & IM opt. - 24 pole synchronous motor. 2 Hartley 24 in sub -woofers Many Tek. Scopes -Send for List: SCHMIDT ENGINEERING Another unique feature is that all ad- 4 Quad ESL loudspeakers CO. 914.724.3376. P.O. Box 103 Stormville, NY 12582. justments can be made from above. 129 2 Decca ribbon tweeters (modified) Mr. Peter Dunlop designed the original 2 Levinson LNC-2 Crossovers Ariston turntable. He has spent con- (l00 hz & 1 Khz) Buy with confidence siderable time developing the SYSTEMDEK 1 Levinson ML -1 (LEMO) preamp and feels, as do we, that it easily competes 6 Levinson ML -2 amplifiers fact: Send foice with or surpasses the older Fons, Linn, or 1pr. Hand-crafted oak or ash trestle Oarr Shure STD designs. stands (for Quads & Decca) the IV does more. Pr 0v on & Tables will be available momentarily and THE H.Q.D. STYSTEM WITH GOOD SOURCE MATERIAL, SHUREE- Ferrous Vhe will sell for approximately $650.00. WILL REPRODUCE A MUSICAL EVENT BETTER THAN ANY \,. IS T) puIV i SYSTEM WE KNOW OF. SUPER TRacICIV. BAS, BEARD SOUND AMPLIFIERS For more information, please write or call: Stereo Dynetic Phono Cartridge The BAS tube amplifiers and preamplifiers SOUND COMPONENTS Consistent record tracking has always been chal. have quickly become the standard of 2710 Ponce de Leon Boulevard lenged by such ever present factors as warp, reference in England and Europe. The Coral Gables, Florida, 33134 static, lint and dust-especially when these a dual power supply and 305.446.1659 factors combine with today's "hot" recordings. amplifier features a floating bias (no adjustments ever need- TWX 812.848.7627 tt 146 OLD BROOKFIELD RD jCARSTONI ; TERSO' Danbury, Conn. olialo ed). All metal work is executed by com- SOUTH CAROLINA'S ONLY HIGH -END STORE the finest (203) 744-6421 (212) 369-6212 puterized machinery and the design, parts audiophile equipment: British American Sound, P.O. Box MON.. NI MID III 1 00 S 30 and workmanship is of such extraordinary Tiiaa. 100 00 1 M UV, 004 3U 1247 186 King Street, Charleston, SC 29402 TF quality that no amplifier has ever failed. PROFILE ACOUSTICS The Profile loudspeaker is of large bookshelf configuration, and uses three very special drivers. The materials employed in the cabinet construction are unique. The workmanship is the finest we have ever seen. Needless to say, we feel In todays ever changing field of audio there exists a storni of hype and confusion By that the sonic quality is most pleasing adhering to certain guidelines we have clearl7 found our calm in the eye of the storni along with a superb bass response. The Honesty, integrity, and expertise have heLbed us to create a unique audio environment Profile loudspeaker will retail for over that is indeed professional in the true sense of the word. $1000.00 a pair. The lines' we represent speak tor themselves. Please contact me for further information. Audio. Research B & W Pyranuti Nakano lu Dealer inquiries welcome. Vandersteen KEF Prnmethean Lux, nan Linn Sondek Dayton Wright GAS Bang E. OvIL;,'n Theta Denon MEN Dynavector RH Labs, Best regards, Dahiquist Grace EMT Vein Audire Grado Signature NICIESY Marcuf Aiivenl AUO10 Sse-STE MS r Paul Heath We ship prepaid throughout the U.S. (714)897-0166 15102 Bolsa Chica Suite A Hintington Beach, CA. 92649 H&H INTERNATIONAL Store Hours - Mon thru Fri 1 00-9 00 Sat 10 30-5 00 Sun 1230-5 00 3047 W. HENRIETTA RD. ROCHESTER NEW YORK 14623 (716) 424-4827

AUDIO January 1980 Free information se To AUDIO readers ... from AUDIO advertisers Look over the below list of advertisers and select those *Write the numbers on the Reader Inquiry Card and from whom you want more product information. fill in all the information. We will rush your request to each company.

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ADC 85 Audio Research 12-43 Ears Nova 124,135 170000 Turntable Hi-Fi Equipment Audio Store Enter No.1 on Reader Service Card Enter No. 6 on Reader Service Card Write Direct to Advertiser Dealer Listing Enter No. 6 on Reader Service Card Electro -Voice 48 ADS 18 Interface: C Speakers L81D-lI Speakers Enter No.15 on Reader Service Card Write Direct to Advertiser Audio Technica 4 Moving Coil Cartridge Write Direct to Advertiser Empire 5 Allison Acoustics 6 EDR. Phono Cartridge Allison Five & Six Speakers Enter No. 16 on Reader Service Card Enter No. 2 on Reader Service Card BSR 25 EMI Tapes 30 ADC Sound Shaper Equalizers Enter No. 17 on Reader Service Card Enter No. 9 on Reader Service Card Altec Lansing 49 Audio 136 Hi-Fi Equipment Garland Audio Store Enter No. 3 on Reader Service Card B&W 26 DM2/II Speakers Write Direct to Advertiser Write Direct to Advertiser American Audiophile 124, 125 Golden Gramophone 125 Audio Store Audio Store 95 Advertiser Bang & Olufsen Write Direct to Advertiser Write Direct to Hi-Fi Equipment Enter No. 11 on Reader Service Card 130 136 14 Goodwin, Inc Apt Hi-Fi Components Hi-Fi Equipment 120 Barclay Electronics Write Direct to Advertiser Enter No. 4 on Reader Service Card Hi-Fi Components Write Direct to Advertiser

H & H International 129 Audiocorn 136 119 Newsletter Audio Store Bryston Write Direct to Advertiser Write Direct to Advertiser Hi-Fi Equipment Enter No. 10 on Reader Service Card Christopher Hansen, Ltd 134 Audiovox 73 129 Hi-Fi Components Carston Studios Write Direct to Advertiser Hi-Fi Equipment Stereo Receiver Entei No. 8 on Reader Service Card Write Direct to Advertiser Havens & Hardesty 129 Carver 55 Audio Components Audio Concepts 136, 140 Write Direct to Advertiser Hi-Fi Components Hi-Fi Equipment Write Direct to Advertiser Enter No. 12 on Reader Service Card Henry's Camera Shop 137 Chestnut Hill Audio 139 Hi-Fi Components Audio Critic 117 Audio Store Write Direct to Advertiser Publication Write Direct to Advertiser Write Direct to Advertiser International Hi-Fi 118 Crown - 74, 75 Equipment Distributors Audio Den, Ltd 121 SA2 Stereo Amplifier Enter No. 19 on Reader Service Card KEF Speakers Write Direct to Advertiser Write Direct to Advertiser Itone Audio 122 VMPS Speakers Custom Craft 117 Write Direct to Advertiser Audio Excellence 139 Dimension Miniature Speakers Hi-Fi Components Enter No. 13 on Reader Service Card Write Direct to Advertiser JBL 11 Speakers DeCoursey Engineering 126 Enter No. 20 on Reader Service Card Audio Horizons 137 Electronic Crossovers Publication Write Direct to Advertiser Write Direct to Advertiser 'VC 27 Hi-Fi Equipment Discwasher 2 Cov. TV Enter No. 21 on Reader Service Card Audio Insight 129 SC1 Stylus Cleaner Audio Equipment Write Direct to Advertiser Jensen 59 D3 Record Cleaning System Write Direct to Advertiser Series I Triax Car Speakers Write Direct to Advertiser Enter No. 22 on Reader Service Card

Audio People 120 Dynaco 112 KEF 79 Hi-Fi Components Speakers Models 303 & 304 Speakers Write Direct to Advertiser Enter No. 14 on Reader Service Card Enter No. 23 on Reader Service Card ree information service AUDIO readers ... from AUDIO advertisers below list of advertisers and select those Write the numbers on the Reader Inquiry Card and you want more product information. fill in all the information. We will rush your request to each company.

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17 Phase Linear 23 Sound Components 128 .. Equipment Phase 7000 Cassette Deck Hi-Fi Components Enter No. 24 on Reader Service Card Enter No. 32 on Reader Service Card Write Direct to Advertiser

L.T. Sound 127 Hi-Fi Components Pioneer Cover II, 1 Sou ndcraftsmen 21 Write Direct to Advertiser Hi-Fi Equipment Hi-Fi Equipment - Enter No. 33 on Reader Service Card Enter No. 43 on Reader Service Card

Larksong 126 Stereo Equipment Polyline Corporation 121 Speakerlab 119 ,128, 139 Write Direct to Advertiser Hi-Fi Equipment Thirties Speakers Write Direct to Advertiser Write Direct to Advertiser Leigh Instruments 115 Speaker Kits ECD Speakers Radio Shack 63 Write Direct to Advertiser Enter No.7 on Reader Service Card Realistic Receivers Write Direct to Advertiser The Speaker Works 127 Lux 65 Speaker Kits Hi-Fi Equipment Reference Monitor International 138 Write Direct to Advertiser Write Direct to Advertiser Speakers Write Direct to Advertiser Spectro Acoustics 51 McIntosh 24 Equipment Rogers Sound Labs 50 Hi-Fi C 32 Preamplifier Enter No. 44 on Reader Service Card Enter No. 25 on Reader Service Card Hi-Fi Equipment Enter No. 34 on Reader Service Card 133

Stanton 3 Mc K's Tapetown 140 Sansui Coy. Ill Hi-Fi Equipment Blank tapes, etc. AU -919 Amplifiers Enter No. 46 on Reader Service Card Write Direct to Adverti.er Enter No. 35 on Reader Service Card

Saxitone 140 Studer Re Vox 93 Maxell 7 B760 Tuner Tapes & Tape Recordings Audio Tapes Enter No. 45 on Reader Service Card Enter No.26 on Reader Service Card Write Direct to Advertiser

TDK 57 Mitsubishi 70,71 Scott 81 Hi-Fi Equipment Honeycomb Speakers Receivers Enter No. 47 on Reader Service Card Enter No. 27 on Reader Service Card Enter No. 36on Reader Service Card

TEAC 61 The Sensible Sound 134 Mordaunt-hort 97 Hi-Fi Equipment Publication Direct Advertiser Speakers Write Direct to Advertiser Write to Enter No.28 on Reader Service Card

Shure 110,111 Take 5 140 Nautilus 72 Hi-Fi Equipment Audio Store Recordings Enter No. 37 on Reader Service Card Write Direct to Advertiser Enter No. 29 on Reiider Service Card Hi-Fi Equipment Enter No. 38 on Reader Service Card 31 Hi -Ft Equipment Tandberg Tape Recording Systems Enter No. 39 on Reader Service Card Niles Audio Corporation 138 Enter No. 48 on Reader Service Card Audio Equipment Write Direct to Advertiser Snell 113 141) Type A Loudspeakers Tape World Blank etc. Enter No. 40 on Reader Service Card Tapes, Onkyo - 47 Write Direct to Advertiser TX-MK11 Receivers 128 Enter No. 30 on Reader Service Card Sonikit 15 Speaker Kits Technics Write Direct to Advertiser Hi-Fi Equipment Enter No. 49 on Reader Service Card Ovation Audio 139 Audio Components Sony 12,13 87 Write Direct to Advertiser Hi-Fi Equipment Toshiba Hi-Fi Equipment Enter No. 41 on Reader Service Card Enter No. 50 on Reader Service Card Pacific Image, Inc.... 137 Sound Advice 121 Renaissance Series United Audio (Dual) 19 Write Direct to Advertiser Audio Components Write Direct to Advertiser ULM Tonearm & Cartridge System Write Direct to Advertiser

Paia 118 Sound Barrier 99 Yamaha 67 Free 1980 Catalogue I1i-Fi Equipment Enter No. 31 on (Reader Service Card Enter No. 42 on Reader Service Card Speakers Write Direct to Advertiser AUDIO January 1980 FOR SALE FOR SALE F.

ADIRONDACK AUDIOPHILES Northern New York State INCREDIBLE House of Hi-Fi is now open with Hegeman, Conrad Johnson, SUPEX - ORTOFON - DENOt, In Just about every way the SONIC DEVELOPMENTS D235 Fidelity Research, Marcof, Grafyx, Haller, D.C. Time Win- TRIDGE OWNERS Send 50' f' stero amplifier is incredible. dows, Ampzilla (G.A.S.) Polk Audio Monitors, KEF, Harmon Preamp. Superb Performance at $. PERFORMANCE: Superb transients, clear extended highs, Kardon ST8, Sleeping Beauty, Audionics, N.A.D., Mayware tronics, Box 2009-A, Huntington, Conr solid bass down through the entire audible range, and trouble formula 4 tonearm, Signet moving coils, AKG cartridges, free reliable cool operation. Toshiba, Sony, and Aiwa. For info. call 518-793.6639 Mon. to Revox TT/Grado Sig. 11 like no $b. PRICE: Only $310 plus shipping. Fri. 11.9 Sat. 10-6. House of Hi-Fi, 50 Miller Rd. (Rt. 9), Glen arm/Grado Sig. 11 like no $51,. GUARANTEE: In addition to a standard 2 yr. parts/labor 2251 Falls, NY 12801. craftsman PE2217 $250, Sony warranty, a MONEY BACK SATISFACTION guarantee. If for Rabco 518E 125, Denon Av320/1036 any reason you are not satisfied, return your D235 within 7 415-941-4762. GREAT GRACE & SUPER SUPEX days and your purchase price of $310 will be refunded. 704, F -8L, F -9L, Linn KOSS MODEL ONE-A ELECTROSTATIL We have in stock the Grace 707MKII, The D235 is a modest powered (35w RMS minimum per Mods for the 707MKII, the Supex SD -900E+ Improved & SD- SPEAKERS - $1500 pr., IMMACULATE channel, both channels driven) solid state amp of the highest 308-237-7993. 900MKII. Free shipping. Visa & M.C. honored. By appt. OX- quality. Because of its superior power supply the D235 is FORD AUDIO CONSULTANTS, Box 145, Oxford, OH 45056, comparable on music reproduction to amps rated at 75w per Revox B-790 Turntable wlOrtofon $650, Fried 513.523-3895. channel and higher and selling for hundreds of dollars more. 13A Speakers $395, Pioneer TX9500 Tuner It is the ideal choice for use with small "monitor" type speak- $115, Kenwood 3070 Turntable w/Shure M95G ers (LS3/5A, JR149, etc.), Quad ELS (truly incredible), mid- $125. All Mint Condition. Eddie; 904-724-8765; late evenings - till 1:00 AM. range/treble units of multi amp set-ups, larger speakers in small to moderate size rooms, and recording studios. The McIntosh C-28 Preamplifier, Immaculate condi- Christo her D235 measures 17"w x 10"d x 4"h behind a 3/16" thick tion $425. Call Binghamton, N.Y. 607-669-4521. brushed aluminum face plate 19"w x 41"h. It is suitable for shelf mounting in rack systems. Crown SX-724, Marantz 7T, Thorens TD -125 IA ansen Here then is your opportunity to PERSONALLY JUDGE the Much more. Box 713, Des Moines, 50303 515.284.1723. incredible sonic performance of this MONEY SAVING amp td under ideal conditions. Compare the D235 with your current JBL AQUARIUS IV S-1091 or pair. B. Sparadeo, Mark Levinson/Sales & Service amp or any amp you are considering buying in YOUR OWN 41 Peach Hill Ave., N.P., RI 02911. SYSTEM AND IN YOUR OWN HOME for up to 7 days. You risk in the West Onkyo 303 Preamp $225.00. 1-218-741-0167. nothing and could save hundreds of dollars. Send your On Display: The entire Mark check' or COD approval to: EMT X5D-15 never used $300. Roy, JR., P.O. Levinson line, including the SONIC DEVELOPMENTS Box 73, North Bend, WA 98045. 134 CLAREWILL AVENUE HQD Reference System; Koetsu, UPPER MONTCLAIR, NJ 07043 INFINITY GRAPHITE on Kenwood KD -500 -810 Fidelity Research, Rega, Linn Products, 'Include non-refundable shipping charges of $5 east coast, w/AT feet, mint, $300. Yamaha CA amp, mint $275. 415-673-4300. Rogers LS3/5A, Pyramid Metronome $7 mid west and central, $8 west coast. New Jersey residents include 5% sales tax. "BRAUN 1020 TRI!-AMPED SPEAKER SYSTEM Showroom Open: Saturday 11 to 5 PR. $700. VAN ALSTINE MODEL 1 PRE -AMP $400, SHEFFIELD 510 MISSING LINC NEW By Appointment: Tues. -Fri. 10 to 5 ELECTRONIC CROSSOVERS ALL TYPES Updated de- 134 - $100. WANTED KYNA PAS -3 (503) 641-5937." finitive booklet describes applications, how to improve speak- 9014 Burton Way er systems; $5.00 postpaid, credited to first purchase. Hunt- HAFLER PRODUCTS AND MODIFICATIONS Beverly Hills, CA 90211 ington Electronics, Box 2009.A Huntington, Conn. 06484. We have in stock the following: DH -101K 213-858-8112 $199.95, DH -101A $299.95, DH -102 head amp We ship prepaid within the U.S. $74.95, DH-101A/DH-102 $399.95, DH -103 black knobs $19.95, DH -106 circuit update for DH -101 $19.95. We have been shipping DH -200's since July, 1979. The supply has been low and the demand high. When this appears we hope to have in stock the DH -200K $229.95, DH -200A $399.95, DH-200KE (universal transformer) $325.00, DH -201 rack mount $24.95, DH -202 bridging kit $24.95. Circuit update installed with precision components $50. Low frequency phono mod installed $22. both mods installed $62. Worldwide shipping, Free shipping in Patented circuitry U.S. Visa & M.C. honored. by appt. OXFORD eliminates pumping AUDIO CONSULTANTS, Box 145, Oxford, OH and breathing. 45056, 513-523-3895

For Information write: RG Dynamics "IMPORTER HAS LIMITED QUANTITY OF 4448 W. Howard St.. Skokie. IL 60076 MOST RECENT PRODUCTION VERSION OF ELECTRO-COMPANIET AMPLIFIERS. 813-366-9414." PROCESSOR THE RG PRO -16W DYNAMIC "MARK LENINSON LNP-2 W/RCA INPUTS $1900.00. THRESHOLD NS -10 (CURRENT FAC- TORY MOD.) M-1 HEAD AMP $850.00. 813-366-9414."

THE POWER AMP COMPARISON TEST: Hafler DH -200, Nikko Alpha Ill, GAS Grand- Grado F3E, $25. 12a Speaker Wire 30ft. All son, Hitachi HMA-7500, Audionics CCp2, Spectro Acoustics 500R, Threshold Free Ship. Save on Hafler and 100 others. Audio Concepts, 1919 S. 19th St., La Crosse, 400A, Series 20 M-22, Bryston 2B, Audire M-2, Mitsubishi DA-A100C. W isc. 54601. SENSIBLE SPEAKERS: Qysonic Array, Tangent RS -4, Thiel 03, KA Imp, DEA Cobra. Symdex Sigma, M -S Festival, Cizek II, Infinity Quantum 3, Acoustat 3 & 4, ESS GUARANTED LOWEST PRICES IN U.S.A. On OUND Transar, Boston Acoustics A-200, Pyramid Metronome 3, Great white Whale huge selection of fine stereo and video equip- Point 3 & 4. CARTRIDGES: Denon 103 & 103D, Onkyo MC -100, Satin M -18X, ment. Over 170 brands available for immediate Supex SD -900E Super +, Dynavector 10X, B&O MMC 20CL, Sonus Gold/Blue. delivery, including most esoteric lines. Credit AKG P8ES, Empire .9, Signet TK7SU. PREAMPS: Levinson ML -1, Rappaport cards. Defective exchange privileges. Please write today! Stellar Sound, 13906, Ventura Pre -1, Threshold NS -10, Spatial. MISC: BIC T-1 & T-2, Harman Kardon 3500. Blvd., Suite 193, Sherman Oaks, CA 91423, NAD integrated, EAR plugs. Philips AH -673. Spectra mat, Statibrush. 3020 (213) 766-9790. ISSUE: ADC LMG -1, BIB accessories. ARTICLES: Speaker Wire, The Hype Abounds. The Conical Stylus -Fact & Fancy. Metal Tape, Should You Buy Now?, The HEATHKITS: AA -1640 $395., AP -1615 Preamp 403 DARWIN, SNYDER, NY 14226 Listening Room & How To Improve Yours, The Smashed Groove Caper. PLEASE $85., AJ-1515 Digital Tuner $285., AA -1515 In- REQUIRED READING BEFORE JOIN US-$15 (4 issues), $19 Foriegn air mail-VERY SENSIBLE. tegrated Amp $185., AD -1304 active processor Shipped prepaid in MAKING ANY PURCHASE $125. All specs guaranteed. 48. (616) 429-2007. FOR SALE FOR SALE FOR SALE

SOUND TECHNOLOGY TEST EQUIPMENT. 10004, opt. "TEAC TASCAN 80-8 EIGHT CHANNEL SYML*SYNC REEL Tired of trying to erase cassette box labeling liners when you Ml. 2, 3, 5. 100, 110, 120. $1900. 17008, opt. 2, 3, 4, DECK. NEVER USED, STILL IN ORIGINAL PACKING. $2500. re-record? New line on heavy index card stock 12 for $2.00 $2300. Excellent condition (517) 882.7284. MR BRCWN (518)783-1974- OR 283-3228." Postpaid. R. Peeler, Box 51, Essex Fells, NJ 07021.

SOUND ADVICE AND POLK AUDIO LOUDSPEAKERS We THE AUDIOGRAM®, a pithy independent newsletter now in THOUSANDS OF LIKE NEW LP's and prerecorded tapes. have the incredible Polk Audio Monitor Series loudspeakers in its third year, provides timely, money saving reports on the Catalogue-$2.00. House of Records, Hillbum, New York stock. The Polk's are definitely the best performance per dol- latest products and techniques. Our critical integrity and real- 10931. TF lar value ever offered in a truly accurated inexpensive istic sense of proportion fill the gap between the commercial loudspeaker. State of the art sound is now available from less magazines and the neurotic underground press. Our latest HORNS-WOOFERSMIDS-TWEETERS at tremendous OEM than $200 per pair. We ship freight prepaid anywhere in the issue of number 12 contains reviews of: savings. Altec, CTS, Electro-Voice, Pioneer, Panasonic, Peer- U.S. within 24 hours upon receipt of order. Write or call for - The best moving magnet cartridge less, Phillips, Polydax and many others. Dozens of hard to information on the Polk Audio Monitor Loudspeakers. - The best headamps find items used in major manufacturers most expensive sys- SOUND ADVICE - The best turntable mat tems. Huge selection of crossover newwork components, au- Village Plaza Ruston, LA 71270 - The best tube preamp tomobile systems, and musical instrument loudspeakers. (318) 255-8000 - Ultracraft AC300 Mark II Send $1.00 for catalog. SRC Audio Dept. AD, 3238 Tower- 9-9 A review of tonearms by Paul Messenger. wood Dr., Dallas, TX 75234. $10/4 issues/1 year. AUDIOGRAM, Box 27406, St. Louis. STAN WHITE MO 63141. Latest thoughts on loudspeaker enclosure Geometry OR 'Demise of the Theory of Relativity' Send $1.00 to: Tachyons THE SOUNDING BOARD, INC. P.O. Box 204 Bloomingdale, II. 60108. 75 Franklin Ave. Nrltt iEari Ridgewood, NJ STATE-OF-THE-ART RIP-OFF? Some people charge $300/ (201)445.5006 $500. We ask $150 T24 Universal MC Transformer No Bet- Come to listen at northern N.J.'s brand new audio salon. We in (0Iit Thirk ter Exists. Similarly our $85 Formula 4 MC -2C moving coil carry quality products such as: Adcom Allison Audio Pro cartridge equals $200/$300 ones. Literature $1 Bill. May DAHLQUIST, D.B. SYSTEMS, VAN ALSTINE, I.M.F., OBELISK, ware Ltd., P.O. Box 58, Edgware, Middx. HA8 9UH England. SERIES 20 Berning Bryston Connoisseur 1.0 UNN SONDEK, CIZEK, TANDBERG, MITSUBISHI, QYSONIC, Conrad -Johnson Dennesen Grace AVID, WINTEK, DUAL, CONNIOSSEUR, GRADO SIGNATURE, Keith Monks Kenwood Purist STEREO REPRESENTATIVES NEEDED!!! GRADO DECCA, STAX, and more. Linn-Asak Linn-Isobarjk Sell 100 brands!! Lowest Possible Prices!! Krasco-REP Linn-Sondek Mitchell A. Cotter DEPT. -998 Orange Ave. West Haven, Conn. THE MONITOR SERIES FROM POLK AUDIO NAD Nairn Precedent 06516TFFILE AUDIO BREAKTHROUGHS now has on demonstration the Professional Systems Engineering remarkable new Polk loudspeakers priced from less than Pyramid $200 per pair. Compare them to the finest loudspeakers in Shahinian Obelisk Signet SUMO "THE POWER" AMPLIFIER, "THE MOAT" BRIDGE. the world: All Polk Audio Monitors utilize high definition po- Snell Symdex Thiel V.P.I. NEW IN BOX - MAKE OFFER. ALSO USED ARC D100 $700, lymer laminate bass -midrange drivers, wide dispersion soft ARC D -100A $850, Levinson ML2 $1425. (408) 244-6724 A new approach to presenting dome tweeters and fluid coupled sub -bass radiators. They are GARLAND AUDIO. 2-0 fine high fidelity components capable of reproducing a highly defined phase accurate three and recordings. 135 TAMPA BAY AREA AUDIOPHILES dimensional sonic image which rivals the thousand dollar super speakers. They sound great with a receiver, Hear the incomparable Theta preamp, Fried speakers and small yet Win Cartridge/turntable. Also J.H., Marcof, etc. Friendly, reveal the fine subtleties of state of the art electronics. Shipped free in U.S. Send for free brochures Polk WW1 knowledgeable service. Call for appointment. on or our other fine lines. AUDIO BREAKTHROUGHS, 1534 Northern 749 middle neck road/great neck, ny 11024 DAJG Audio: 1-813-9374147 1-0 Blvd., Manhasset, U, NY 11030 (516) 627-7333 TF (516) 466-5674

Tandberg TD 20A: 101/2" Reel Tape Deck, 344 271/2 IPS., Lined Mixing Controls & Designed for both Oxide & Metal

Tape: 8 mos. old w/8 Maxell 35-180 Tapes - $1,250. (216) 855.4356. 1-0

TAPCO and ELECTRO-VOICE, mixers, equilizers, amps, mics, and raw loudspeakers. Write for low mail order prices, Sonix Co., P.O. Box 58, Indian Head, MD 20640 8-9

TAPE HEAD REFINISHING - Precision method full frequency The lowest distortion response. $15.00 ea. One day service. E. Maher, 5 Evans of any expander Place, Orinda, CA 94563. available.

TDK SA-C90's $2.89 ea. SA-C60's $2.00 ea. Min. 10. Ship: For information write: RG Oynamics $1.60 /ea 10. CC/MO/MC. Audio World Box 7518, G.R., MI 4448 W. Howard St.. Skokie. IL 60076 49510. BC THE RG PRO -20W DYNAMIC PROCESSOR THE LISTENING ROOM INC. 590 Central Park Avenue Scarsdale, N.Y. 10583 (914)472.4558 Now in Fort Lauderdale... Cordially invites you to audition our fine line of equipment. State of the art components for the

THRESHOLD - BRYSTON - SPATIAL - PYRAMID audio perfectionist and serious listener. METRONOME 2+2 - PLASMATRONIC SPEAKER - DAYTON WRIGHT ESL - QUAD ESL - SNELL ACOUSTICS DAHLQUIST KEF105-DYNAVECTOR-DENON- YAMAHA TANDBERG Audio Research Acoustat Denon B &W Armstrong Chartwell Lux POLK AUDIO - - GRACE NAKAMICHI STAX - R.H. LAB - :S3/ Tangent Polk GAS Conrad Johnson Audire Ariston Connoisseur 5A BBC MINI MONITOR BY CHARTWELL - KEITH MONK - SEQUERRA ADC Grace Supex Grado Goldring DB Systems Quatre Stax HAFLER JANIS FONTEK HEADPHONES - AUDIO PUSLE - LINN SONDEK OASIS GREAT AMERICAN Theta Plasmatronics Transcriptors Dynavector Vandersteen

SOUND -EMT - HADCOCK -SRATHCLYDEPSE - OBELISK - Complete selection of direct to disc recordings. MARCOFF - ULTRACRAFT TONE ARM AUDIO STANDARD

GRADO SIGNATURE III - IMPULSE - FIDELITY RESEARCH TANGENT - DIRECT TO DISK RECORDS AUDIO INSIGHT i The Promenade at Bay Colony Visit our private studios. We ship free anywhere in the Conti- 6286 N. Federal Hwy., Ft. Lauderdale, FI 33308 305/491-7677 nental U.S. We invite Inquiries. TF AUDIO January 1980 FOR SALE FOR SALE FOR SALE

THE AUDIO JOURNAL TM, in its upcoming third issue, re- The Listening Room Loves views the Threshold 51.10 preamp, the Audioetc/Rabco L.A.-SOUTHERN CALIFORNIA straight line tracking tonearm, the Dayton -Wright XG-10 elec- POLK AUDIO MONITORS We carry the smallest selection of only the best trostatic speaker system, the Magnepan MG -2A planar values and the best equipment. We demonstrate by speakers, the Threshold 4000 amplifier, the Orotofon MC -30 The golden ear of Marcel Wittman has established the Listen- appointment to insure a meaningful demonstration. cartridge, the Theta tube preamp, and several others as well. ing Room as one of the nation's premier audio salons. Not Linn Sondek turntable. Linn Asak cartridge. Spatial The recordings section boasts articles about contemporary only do we have the finest esoteric audio equipment costing Coherence TFET Valve preamp. Rogers BBC LS3 15A composers and recordings of their music. The Audio Journal well into the five figures price range, we have the Polk Audio speaker. PSE Studio One preamp & Studio Two is fast becoming the leading publication for audio enthusiasts Monitor Series Loudspeakers beginning at just $99.95 each, power amp. Stax headphones. Musical Fidelity pre- and music lovers everywhere. Subscription rates for four and easily worth many times their price in sound value. Come preamp. Denon tables. arms. cartridges. Meridian issues: USA - $18 (first class), Canada - $22 (first class), in to listen, write them for full literature, or give us a call. amp. preamp. tuner Decca Ribbon Tweeters. Koss Outside North America - $24 (Air mail). Send a check or Shipped free anywhere in the U.S. Electrostatic speakers. Satterberg subwoofers. SAEC money order today to: The Audio Journal, P.O. Box 4205, Listening Room metal record pad & Cables. Chartwell polypropylene Macon, Georgia 31208. Foreign subscribers please remit in 590 Central Park Avenue speakers. LiveWire & live Wire Litz. Peterson Audio US funds only. 1-0 Scarsdale, N.Y. 10583 link cables. Haller amp & Preamp. Osawa record (914) 472-4558 pad 9.9 Three Phase Audio EXECUTIVE AUDIO BY APPOINTMENT ONLY (2131 395-6400 2210 Wilshire Blvd Suite N 207 Santa Monica. CA PAUL HEATH AUDIO 104 Lafayette Drive (318) 981-4951 Offers the following new or mint -condition Lafayette, LA 70503(318) 981.4952 used equipment at sacrifice prices: NEW ENGLAND AUDIOPHILES Goodwin's Inc. is unique in the audio field, offering a few select products Beveridge 2SW1 System (latest), Acoustat Ariston Mitsubishi Auto which are acknowledged to be the finest. These prod- Monitors, Sequerra Pyramids, Harbeth Mone- Audio Technica Mobile Fidelity ucts are properly set-up, and may be auditioned in a tors, Koss Electrostatics, Rogers Export Moni- Becker MXR comfortable, relaxed, living room environment tors, Dahlquist Woofer & electronic crossover, Berning Osawa Our reference is the Mark Levinson HQD system, with Janis Subwoofer, Obelisk loudspeakers, RH B&W Plasmatronics a Mark Levinson Studer Labs 30ips master tapes played on Subwoofer, Bose 901's. BGW Precedent Audio A-80. The degree to which this system approaches the PRE -14 Theta preamp, Rappaport preamp, Dual PS Audio sound of live music is literally breathtaking. Quatre GC 500 and DG 250C gain cells and Fuji Quatre Goodwin's represents: Mark Levinson, Quad, Linn Son- preamp, GAS "Grandson", Bedini/Strelioff 200/ Fulton Revox dek, Syrinx, Verion, Draco, Symdex, Precedent Audio, 200, M -A T.V.A.-1 tube amplifier, AEA Analogue Shure Fidelity Research, Pedersen Acoustics, and Win Labs. 520 preamplifier and 620 stereo amplifer, HAPI Hartley preamplifier, STD turntable, Ariston turntable Kenwood Sonai If you would like to avoid the planned obsolescence of and numerous others. Please Inquire. Monks Sony most stereo components, and are interested in the finest ... Keith music reproduction, please call Goodwin's for an Marcof Ultracraft PAUL HEATH AUDIO Meridian appointment. 3047 W. Henrietta Rd. 136 Goodwin's Inc. 33 Newbury St. Rochester, N.Y. 14623 (617) 266-0608 Boston, MA 02116 (716) 424-4916 TONEARMS-CARTRIDGES-TURNTABLES at lowest prices. Most brands available, including MC. Send # 10 SASE for quotes. Audio Unlimited, 401 Reynolds Circle, San Jose, CA 95112.

TRADE UP to the MICRO CPU 100 fm tuner Audiocom High Technology Audio It may have been out of the question at $2000, but the new retail is $995. Subtract even more for your trade-in ADS, Allison, Apt, Audio Pulse, Audionics, B&W, Bruer, Burwen, Cotter, Dahl- and this magnificent tuner can be yours at a surprisingly quist, DCM, Denon, Draco, EMT, EV, Eumig, FR, GAS, Grace, Grado, Janis, JR, low price. We offer very generous trade-in allowances on KEF, Mitsubishi, MK, NAD, Nakamichi, Ortofon, RH Labs, Revox, Rogers, Snell, your old tuner or other audio equipment. A rare chance Spectro, Stax, Symmetry, Tandberg, VA Systems to own the best at a reasonable price (see Audio, Nov. '77). Write us for a quote, or better yet, phone after Major credit cards honored. Phone orders shipped promptly: business hours and we can discuss your trade-in: (617) 874-0706, mon.-fri., 6-8 pm. (ask for Dick) 177 Sound Beach Avenue, Old Greenwich, CT Phone: (203) 637-3621 AUDIO CALIBRATION, box 250, Westminster, MASS 01473. TF

ROGERS REFERENCE MONITOR SYSTEM This is a biamped system designed by Rogers using the incredible LS3/5a's. Hear this system as well as the Rogers E/A. GARLAND AUDIO, INC. Monitor II's, Compact Monitor's, A100 amp and T75 tuner. By appt. Free shipping. Visa & M.C. honored. OXFORD AUDIO CONSULTANTS, Box 145, Oxford, OH 45056, 513.523.3895 WIH!EIRE IGvILS`' 11-11-1 IF_ IFIIvEST IIS IGIGIGIG IEv11) 0111

AUDIO RESEARCH B & W MARK LEVINSON MAGNEPAN ROGERS SEQUERRA LUXMAN NAKAMICHI QUATRE DENON MITCH COTTER GRACE GALE FIDELITY RESEARCH QUAD F.M.I. R.H. LABORATORY G.A.S.

Call or write for a FREE subscription to our quarterly newsletter! GARLAND AUDIO 60 Stevens Creek Blvd. San Jose (408) 244-6724 es/Thurs, 11-8 - Wed Fri, 12-6 - Sat, 10-5 -and by appointment- L q FOR SALE FOR SALE FOR SALE

THRESHOLD VACUUM TUBES, tube -peculiar parts. All kits/parts for cir- The Class A Power Amps and Preamps are on display for your cuitries described in our 230+ page Modification Manual. auditioning, State of the Art performance and meticulous Write for list to AUDIO DIMENSIONS, 8888 Clairemont Mesa craftsmanship. At G -B Electronics (201) 427.8885 for ap- Blvd., San Diego, CA 92123. (714) 278-3310. 9.0 TWO $500 WONDERS pointment in Northern New Jersey. 1.0 VERION MK1 TRANSFORMER $265. (315) 478-2753. Threshold 4000, state of art super amp, perfect condition, AXIOM TLT-1 (2011746.2794. Williamson Tube Power Amp W -5M 25 Watt Mono with Pre Amp. Excellent Condition $150 + postage; 501224.2390. TOP -RATED CARTRIDGES UP TO 70% OFF!! LOUDSPEAKER We feature just about all of the finest phono cartridges on the Wisconsin Has: Audionics, Denon, Luxman, Haller, Polk, market at the lowest possible prices. Our selection includes Mayware, STAX, Micro -Acoustics, Connoisseur, Nagatronics, cartridges that are normally sold for the full retail price! Our Aiwa, I-itachi, Kenwood. Lit. and prices on request: The SYSTEM most popular lines include Acutex, ADC, Crado, Nagatron, Sound Seller, 1706 Main St., Marinette, WI 54143 715-735- Ortofon, Shure, Sonus, Stanton and many others that we 9002. The affordable floorstanding speakers can't even mention by name. Just call us at 212-254-3125 with the for more information or write to Direct Discounts Ltd., P.O. Wisconsin Has; Audionics, Denon, Luxman, Hafler, Polk, speed, tonal balance and imaging Box 841, Cooper Station, NY 10003. We accept phone orders NAD, Aiwa, Connoisseur, Braun, STAX, Nagatronics, Grado, not normally achieved by with your M/C or VISA. R.G., Grafyx, Soundcable and more. Write or call for prices comparably priced products. and literature: Sound Seller, Box 224, Marinette, WI 54143. TOURING SOUND SYSTEMS, 2, 4 and 8 Track Studios. (715) 735-9002. Disco Sound, Cervin Vega BGW, Altec, Shure, AKG, Tapco, PRECISION Dyna, Revox, EV, Beyer, Cetec, etc. K & L Sound Service, 75 WORLD AUDIO WESTCHESTER, INC. North Beacon At., Watertown, Mass. 02172. (617) 787-4072- Westchester's finest audio sales and service dealer is proud to Att: Ken Berger. TF announce the addition of: FIDELITY C7 Fried Loudspeakers TREMENDOUS SAVINGS to the already fine lines ON DUALITY COMPONENTS of AR, AKG, ADC, Pro-Accutrac, The cost effective cascode tube preamp AND CARTRIDGES. Over 200 labels. Audioworld, Quanta, CM Labs, Celestion, Decca, Dir. -to -Disc, Discwasher, P.O. Box which 7518, G.R., MI 49510.616-241-2994 J.V.C., J.V.C. Pro., Kos, Lux, L.S.S., Maxell, Panasonite, offers 2.7 pm. Pick- quiet, open and transparent reproduction. ering, Qysonic Array, Rotel, Scott, Sennheiser, Soundcrafts- TUBE AFFECTIONADOS: If you own an Audio Re- man, Sound Source, Stanton, Supex, Thoren, Tandberg, TDK. search, Brook, Conrad -Johnson, Dyna, Dynavector, Shipping is free in continental U.S. Fisher, H -K, Heath, Leak, Leonard, Lux, Marantz, McIn- WORLD AUDIO WESTCHESTER, INC. AMERICAN AUDIOPHILE tosh, Precision Fidelity, Quad, Scott, Sherwood, NA, 211 North Avenue Western Electric or any other fine tube preamp, 716 Madison Ave, New York, NY 10021 amp or New Rochelle, NY 10801 tuner that uses a 12AX7/ECC83, (212) 751-9733 12AU7/ECC82 or 914-576.3230 12AT7/ECC81, you are not getting all that you paid for. 2-0 5 Sunnse Plaza, Valley Stream, NY 11581 Replace your old tubes with our newly -designed state -of. (516) 561-7114 the -art Gold Aero/ALLEGRO 12AX7B-12AU7B-12AT7B YAMAHA C-2 PREAMP, $395. (614) 451.1890, (614) 261. ALL SHIPMENTS PREPAID AND INSURED & experience greater clarity & definition without glare or 2446. FREE THROUGHOUT CONTINENTAL U.S. 137 harshness. The ALLEGRO B Series are the first & only MASTER CHARGE & VISA ACCEPTED tubes guaranteed to improve your system or your money 4 channel, 4 track Crown recorder. Contact Dave (214) 758- back. Free replacement against defects for one full year! 3913. Only $6.95 each + $2 handling per order (minimum order=6) + shipping. All orders shipped via UPS -COD. OEM & resale pricing available upon request. ALLEGRO Issue #3 is now available. It contains reviews of the AUDIO STANDARDS MX -10A SOUND, home of the fabled SP3A-leegro preamp, 15015 pre -preamplifier, the DENNESEN Soundtracktor, the DENON PCC -1000 phono Ventura Blvd., Sherman Oaks, CA 91403. (213) 766- crosstalk canceller, the JML protractor, and the THETA preamplifier Issue #3 also features reviews of the BREUER 5C, DENON DA -3d7, 91019-12am. Good health & good sound, Richard David AUDIO DYNAVECTOR DV -505, FIDELITY RESEARCH FR -64s, GRACE G-707MKII, G-704 and G-714. HADCOCK Katz GH -228 Super, INFINITY "Black Widow" GF. JH Audio Labs, LUSTRE GST -1 and iiORVONS GST -801. MAYWARE Formula IV Series III MICRO MA -505X, MISSION 774, SME III, TURNTABLES, TONEARMS, M/C CARTRIDGES AT TRE- 3009 Series STAX UA-7cf-m, SYRINX PUt, WOODLESS LURNE WLP-1, and ULTRACRAFT AC-3000MC pickup arms, plus reviews of the DENON DL -303, MENDOUS SAVINGS. Fantastic selection. No BS Pricing. FIDELITY RESEARCH FR -1 MK3F, FULTON RS, GRADO Signature III, KOETSU AUDIOWORLD, Box 7518, G.R., MI 49510. 606-241.2994. 2- MC -ONE, LINN ASAK DC -2100K, MISSION 773, ORTOFON MC -30, PRECISION FIDELITY, SUMO II. SUPEX SD -900 Super Il and SDX-1000, WIN LABS SDT-10Type 7 pm. M.F. V/M. P.O. BOX 10973 IIC, and YAMAHA MC -1S phono cartridges. Subscription rates to AUDIO HORIZONS'. for six issues are U S - $18, Canada and Mexico - 520: and outside North America - $26 Two Rabco SL 8E arms - $75 each - (206) 746.8621. St. Louis, MO 63135 (AIR MAIL). Please remit in U S funds only. Sample copies of all issues of AUDIO HORIZONS are available for S4.50 each (U. S., Canada, and Mexico). and $6.00 each (outside North America) USED AND DEMO SALE: Mark Levinson ML 1, $1325; Spati- al NA 1, $750; Luxman CL -35 Mk III, $425; Threshold NS

10. $800; Paragon 12A, $550; G.A.S. Thadra II, $750; Ken - wood L -07-M, $495 pr.; Audio Research D100A, $775; Lux - man M-2000, $600; Threshold 4000, $1600; Ariston RD l Is, $225. GOLDEN GRAMOPHONE, 2858 W. Market St., Akron, Pacific Image, Inc. is proud to announce Ohio 44313 (216) 864-4411. 2-0 its appointment as the exclusive San Francisco bay area dealer STEREO COMPONENT for the astonishing Video Tape Equipment AKAI B1C Harman Kardon RENAISSANCE SERIES Phase LinearALTEC Kenwood Electrostatic loudspeakers, brilliantly engineered and built by TEACMarantz Sony Technics. SanyoJVC JBL Pioneer Dual Dr. Roger West of SOUND LAB ELECTRONICS. RCA Photographic Equipment Too! If you enjoy the means to be able to indulge yourself in what TO ORDER CALL TOLL FREE 111 will no doubt become the most sought after esoteric speaker (800) system yet available, arrange for an audition. By appointment 421.8537 !1 only. R PS . t PACIFIC IMAGE, INC. P.O. Box 169 Woodacre, California 94973 trgäwi 415-488-0293 [CM CAMERA t.FIaVIDEO Prepaid shipping within the continental U.S. HI516 W. 8, St. Downtown 90014 AUDIO January 1980 SPEAKERS WANTED TO BUY BUSINESS OR TRADE OPPORTUNITIES VENEER SPEAKER CABINETS Hardwood Walnut Speaker with grill. Routed or unrouted, front baffles, or com- Cabinets PIONEER SD 1000 OR SD 1100, SCOPE DISPLAYS, NEED CABLE FM BROADCAST STATION. Unique no investment/ self-addressed stamped enve- plete SPEAKER KITS. Send NOT BE WORKING! 805-526.8650. experience business makes money! Others work for you! Free lope for complete brochure. KUSTOMIZED SPEAKER SYS- Details "CAFM," Box 130444, Paradise, CA 95969 TEMS, 2604 GLENN CIRCLE, POWELL, TN 37849. WANTED - Instruction booklet for Kenwood 5066 Tape - Performance Box Recorder. (or Copy) Henry S. Taylor - 10170 Huguenot Rd., CAMPUS REPS High Loudspeakeirs, WANTED TO BUY Richmond, VA 23235. 1-0 18009, Seattle, WN 98118 TF OR TRADE WANTED: MARANTZ & McINTOSH TUBE EQUIPMENT. Want money? Hate hard work? Lazy way to big money. Sam Aberst, P.O. Box 480436, L.A., Calif. 90048 (213) 276- Cleaver plan $2.00 (Refundable) Noble, Box 10033, Houston, 6727. 9-9 TX. 77206. JBL HARTS-FIELD 1 or Pr. 313-229.7378. 2.9

WANTED MARANTZ 7C, 9A's. G Sabourin, 3463 Ste Fam- Manufacturer Seeking Inventions. Advantek, 1100 17th ille, # 2107, Montreal, H2X 2K7. NW, Washington, DC 20036. 10-0 HIGH FIDELITY

BRITISH HIGH FIDELITY in El Paso, Texas. There are even McINTOSH C22 & 275 and Marantz 7c & model 9's, Exc. to PLANS & KITS fewer for sale second-hand. Ls3/5A Monitor. The much ac- mint. 713.729-1658, Texas. 1.0 claimed BBC design for small speakers. Louis Peinado ANTIGRAVITY Propulsion Device. Free Brochure. RDA, Box ("King's Kid") 915.542-1614. McINTOSH OR MARANTZ any kind of tube amps: Pay top 873-N, Concord, NC 28025. dollar (213) 278.3430, 8633 Airdrome St., LA, Calif. 90035. UNZOO OBFUSCATION OF SALON AUDIO. STATE-OF- FREE! Exotic Veneer Sample Plus Illustrated Supply Cata- II, ANALOG, TECHNICS, PRO, McIntosh 3500 and Marantz 240 or 250 US urgently need- THE-ART: PHASELIN-EAR log With Simplified Instructions. Announcing! New Iron -On ed. Pay the best price. (514) 482.9372 call collect. 3.0 NAKAMICHI, KENWOOD PURIST, PSE, NIKKO, PRO DENON, Veneering Technique. Learn How To Create Beautifully RTR, MARK LEVINSON, VAN ALSTINE, DYNA, TANDBERG, OPEN REEL pre-recorded tapes. Rock, folk, jazz, classical Veneered Furniture Quickly, Easily! Exotic Veneers, Inlays, KIRKSAETER, LECSON. OTHERS: ADS, BOSE, B & O. MCIN- Supplies. Hurry! Morgan Allk13, 1123 Bardstown Rd., Louis- stereo, quad (8 - track quad also). A few of each for sale too. TOSH, KLIPSCH, AUDIO PULSE, BRYSTON, THRESHOLD, 40204. SASE. Ray, 1293 French Ave., Lakewood, Ohio 44107. 11.9 ville, Kentucky DAHLQUIST, KEF, SAE, YAMAHA, LUX, AND OVER 141 MORE. INCREDIBLE DISCOUNTS, PROFESSIONAL ENGI- TAPE-SLIDE SYNCHRONIZER, multiprojector lap-dissolve NEER AVAILABLE TO GIVE FREE, NO B.S. ADVICE AND plans, $5.50. With mixer, compressor, preamp schematics, INFORMATION. SEND $5.00 FOR NEW 36 PAGE CATALOG $8.50. The Millers, 1896 Maywood, S. Euclid, OH 44121. TF CONTAINING 2,500 HIGH -END AUDIO FTEMS; PASSIVE EVALUATED:G.E.A./E., Drawer 33 (DEPT: A.), Blackhawk, UNCONVENTIONAL REPLACEMENT KIT for single -play COLORADO, 80452, OR CALL: (303) 582-5200, 1:00 p.m, turntable mat. Greatly reduces dust contact. $3.50 postpaid. BUT POWERFUL until 9:00 p.m. (MST) GOLDEN EAR AUDIO/ELECTRONICS AUDIO PLEASURE, P.O. Box 498, Croton-on -Hudson, NY ACCEPTS: MC, VISA, BANK, CHECKS, TRADE-INS AND 10520. 2.0 HOME TRIALS.

MOM 138 11111103M -.4 A í A

The CPM-31 Universal Component Patching Matrix combines tape decks, equalizers and signal processors in nearly limitless combinations. It simplifies the tasks of recording, dubbing, equalization, mixing, monitoring and signal processing. It eliminates the "patch -cord headache." And the CPM-31 adds no hum, noise or distortion. For more information, write to:

Niles Audio Corporation P.O. Box 160818 Miami, FL. 33116

Hiles /,, The most accurate audio Rogers mini monitor in the world. BRITISH E HIGH-FIDELITY Dealer Inquiries encouraged. Reference Monitor Int. Inc., 2380 "C" Camino Vida Roble, Carlsbad, CA 92008 HELP WANTED RECORDS FOR SALE

AUSTRALIA-NEW ZEALAND WANT YOU!! 50,000 Jobs! AUDIOPHILES! Direct -Disc, Digital, Mobil Fidelity -All labels - Big Pay! Reports $2.00. AUSTCO, Box 2069-K, La Puente, CA Low Prices Fast Service. Write for free catalog. Direct Disc 91746 1-0 Discounters, 2245 New Hope Church Rd., Raleigh, NC 27604. 9.9 RADIO-TV Jobs... Stations hiring nationwide! Free details: Western "Job Leads," 1680 -PH Vine Hollywood, CA 90028 DIRECT TO DISC AND DIGITAL RECORDINGS: All labels at low prices. Telearc, Discwasher, Audio-Technica, Sheffield, Pennsylvania's INSTRUCTION & Denon PCM, Crystal Clear, Mobile Fidelity Labs...WE HAVE THEM ALL!! (and morel!) Send for FREE price list and Quality Audio EDUCATION Newsletter or $2.00 for descriptive cataloge DISConnection, P.O. Box I0705 Tampa FL 33679. Dealer "PASS FCC EXAM" over 1200 questions, answers, discus- Thresh-ld sions, illustrations. 3rd, 2nd, 1st, phone, radar, broadcast, FREE SOUNDTRACKS & CASTS CATALOG! Personalities! Watson Labs endorsements. $14.95. SPECIFIC SKILLS INTERNATIONAL ST/OC Valuebook: $4. RTSA 711 W. 17th G-1 Costa Mesa, Brystor M&K Systems Inc., P.O. Box 1233, Cocoa, Florida 32922. Mastercharge/ CA 92627. TF Apt/Holman Magneplanar VISA. 2-0 Nikko Polk MILWAUKEE! The Audio Emporium: we have over 100 di- DCM Speakers PUBLICATIONS rect discs and other high quality LPs, most labels and con- Sony stantly new releases. We also have the Keith Monks record Hafler Rogers LS3 5A FREE CATALOG ... Classical Cassettes ... pure .. . cleaning machine. 6900 W. Brown Deer Rd. Open Tues. thru Duntec-t Infinity natural sound ... FOREIGN DEALERS INVITED EKR Sat. 10-6, (414) 354-5082. ... TF Linn Altec Lansing Classics, GPO Box 1977AX, New York, N.Y. 10001. Scndek RARE OUT-OF -PRINT LP's. Factory Sealed - 99c to $3.99 Grado Janis TERRIFIC SWAP OFFERS NATIONWIDE ea. Over 25,000 in stock. List - $1.00 Record Warehouse, Denon - Thorens Rcvrs., amps, Us, Audio, Ham Gear, Etc. 5 issues $2! "Elec- Box 4617, Dept, AO, Rochester, New York 14613. Fidelity Research ADC tronic Trader," Box 73-A, Folly Beach, SC 29439. T.F. Supex SAE RECORD HOUND, Box 88A, Eagleville, PA 19408. Fills want YELLOW PAGES OF AUDIO --$3.95 Ariston Visonjk list? Doggone right!!! 334 specialist. Fast, friendly Sourcebook to 1,100 periodicals, 250 books, 7,500 products! service. Grace Blaupunkt 10-0 Future Publications, 137 Valley Park S, Bethlehem, PA 18018 Scheiber Decoder Grundig 1.0 "RECORD JACKETS. Replace old, torn, LP jackets with Cotter AIWA clean, glossy, pure white or black jackets. Plastic lined inner Marcoft Sony ANNOUNCEMENTS sleeves, 78 sleeves, opera boxes. Free catalog. CASCO A6, Symmetry Technics- Pro. Box 8212, Columbus, Ohio 43201." TF Free Promotional Albums, Concert Tickets, Stereos, Etc. plus mu4h m'aie... Information: Barry Publications, 477 82nd Street, Brooklyn, RECORDSAVERS, POLY -LINED INNER SLEEVES TEN NY 11209. Direct -To-Disc Recordings CENTS EACH, POSTPAID, MINIMUM 100. DEO, INC., BOX EMPLOYMENT 452D, GLENVIEW, IL 60025. 6.0 SH.PPED PREPAID b INSURED INFORMATION RECORDS, RECORDS, RECORDS OWIT10N AUDIO Old, New & Direct Disc too! Send $1. for Complete Info, 6019 Broad St.. Mall S.E.O.J., 519 Wheat, Johnstown, PA 15902. 4-9 v JOURNEYMAN CREDENTIALS GRANTED LEGITIMATE! Pittsburgh, Pa. 16206 Write: National Craftsman Union, 210 Fifth Avenue, Suite SOUSA RECORDS. Free catalog upon request. Stanford. Box 1102, New York, NY 10010. 10-0 36163, Grosse Pointe, Mich. 48236. 1.0 (412) 441.4550 JEWELRY

GEM STONES, INVESTMENT. Direct from importer, save. Send $50 check, specify Aquamarine, Saphire. Approximately LEGENDS MOVE Am) mow two carat size. Monthly investment plan available. Candlelight Chestnut Hill Audio has moved and grown. We now represent Audionics, Bowers & Wilkins, Jewelry, Box 15024, Nashville, TN 37215. 1-0 Bryston, Cotter, DCM, Denon, Fidelity Research, Grace, Grado, Hafler, Hegeman, Impulse, Janis, JR149, Linn Sondek, Levinson, Marcof, Precedent, Quad, Rappaport, Revox, Rogers, MUSICAL INSTRUMENTS Sequerra, Snell Acoustics, Sony/Pro, Spendor, Symdex, Symmetry, TVA, Tandberg, Tangent, Technics/Pro, Theta, Threshold and Vandersteen. All of these legends at 311 Cherry Street, ELECTRONIC MUSIC and home recording in Polyphony Philadelphia, Pa. 19106. (215) 923-3035. magazine. Advanced applications, interviews, projects, computer music. Sample, $1.50. Subscription (6 issues), $8 US/ POLYPHONY, I:I'I). $10 foreign. Box AM20305, HILL Okla. City, OK CHESTNUT Ml)I() 73156. 5-0

GIBSON LES PAUL, OVATION, GUILD, MARTIN GUITARS: 41% OFF, LOWEST PRICES. FREE CATALOG. MANDOLIN BROS., 629 FOREST, S.I., NY 10310. (212) 981-3226. 1.0 udio xcellence SpeakerGuts. IF' TO THE PERFECTIONIST L7////// A I1,'910 STE RFO SHOWROOM OH)!('A1-E1) The absolute latest in Presenting Components from the Prestigious Companies of advanced speaker technology. Wave Aperature'' THRESHOLD ROGERS MAGNEPAN KOETSU Drivers, the Patented G' Nestrovic Woofer System. raw I IJllllllll AUDIONICS SNELL PYRAMID SIGNET speaker components selected for their excellence. Horns, crossovers, subwoofers, woofers, WIN LABS DENON OBELISK HAFLER midranges, horn and dome tweeters. Over 30 in all. Build your own speaker system and we'll provide top quality BEVERIDGE AXIOM SYMDEX BRYSTON speakers and design information. Send for FREE 48 page color catalog from the largest. most experienced speaker LINN SONDEK DCM MARCOF SPATIAL kit manufacturer in the world. DON'T DELAY. Write today, M.A. COTTER PSE SUPEX SYMMETRY PLASMATRONICS LUX TVA FID. RES. 584 Washington Street. San Francisco 94111 415-433-1335 4eciketIcñA -AD, 735 N. Northlake Way ept. Seattle, Washington 98103 AUDIO January 1980 TAPE AND TAPE AND SERVICES TAPE RECORDERS TAPE RECORDERS CUSTOM RECORDING SERVICE, Tapes, discs, and cassettes. Stereo and mono. Live and copies. Editing. Masters NAME -BRAND RECORDING TAPE, custom loaded. Avail- ACTION SALE! TDK AUDIO TAPE (Lots of 10 only) and pressings. High quality at reasonable rates. Joseph able in cassettes, reels, cartridges. Huge savings from manu- Dc -60 $1.19 each, DC -90 $1.49 each, SAC -60 $2.10 Giovanelli, Audio-Tech Laboratories, 2819 Newkirk Ave., facturer. Also low everyday prices on Maxell, TDK, Ampex, each, SAC -90 $2.90 each. TDK VIDEO TAPE (No mini- Brooklyn, N.Y. IN9.7134 TF Scotch, BASF, etc. New catalogue now available. MJS, 2514 mum order) 1120 4HR. VHS $16.95, L500 2HR. BETA Seaboard Ave., San Jose, CA 95131. (408) 262-8793. $13.95. Add $3.00 shipping per order. N.Y.S. residents JBL SPEAKER WARRANTY STATION- RCI, 8550 2nd Ave- add 8% sales tax. Empire Action Audio/Visual, P.O. Box nue, Silver Spring, Md. 20910. Mall orders Welcome. SCOTCH RECORDING TAPE, lowest TAPE prices CENTER 248, Dept. A, Howard Beach, New York, 11414. 1.0 Box 4305B Washington, D.C. 20012. USA, APO, FPO 5.9 NASHVILLE RECORD PRODUCTIONS WILL PRESS HIGH QUALITY PURE VINYL RECORDS FROM YOUR TAPES. SEND TDK, MAXELL, MEMOREX, BASF, cassettes, reels 8 -tracks. TAPE RECORDINGS FOR SAMPLE RECORD AND PRICE LIST. ALSO FINEST DISC Lowest prices. New, Guaranteed. FREE CATALOG. S & S MASTERING. 469 CHESTNUT ST., NASHVILLE TENNESSEE Audio, P.O. Box 94485, Schaumburg, IL 60194 TF 37203 TF CHRISTMAS CAROLS CASSETTE ... 60 minutes ... $2.95 plus 50c postage ... EKR Classics, GPO Box 1977A0, New !!!QUAD LIVES!!! For all the latest happenings on the sur- SAVE up to 00% BY MAIL on: SCOTCH, TDK, BASF, York City, 10001. 10.0 round -sound scene, tune into 4 QUAD/EVOLUTION. THE MAXELL, MEMOREX, CAPITOL MUSIC TAPE, CERTRON newsletter for the disc-criminating Quadraphile! Discounts on (over 180 different reel á cassette tapes to choose from); ON OPEN REEL from master tapes. Argo, Telefunken, Van- hard and software!!! 4 QUAD/EVOLUTION, 23757 Canzonet top brand recorders; America's largest collection of taping guard, Unicorn, MHS. Catalogue $1.00. Barclay-Crocker, St., Woodland Hills, CA 91367. 2-0 accessories, too. Same day service. FREE catalog. Room 1470-A, 11 Broadway, NYC, 10004. TF America's Recording Tape Specialists OPEN REEL TAPES. Nips, Dolbyized releases from RCA, MISCELLANEOUS London, DG, Warner and others. Airline tapes, quad. Catalog STaXITONC COLLEGE STUDENTS! Improve your grades. Send $1.00 for 1776 e Columbia Rd., Washington, D.C. 20009 and updates, $1. THE REEL SOCIETY, P.O. Box 55099-A, (202)462-0800 Valencia, CA 91355. 9-9 356 -page, collegiate research papers catalog. 10,250 available. RESEARCH ASSISTANCE, Box 25918AD, Los Angeles, California, 90025. (213)477-8226. 9-0 BLANK TAPE SALE RADIO PROGRAMS

TON SA C90 05 AMPEX GRANDMASTER I.90 2 69 TURNTABLE DUST COVER POLISH. Eliminate scratches. TIM AD-C90 45 AMPEX GRANDMASTER 11.90 309 4oz. bottle, $4.00. Barbalan Enterprises, Box 7278, Stn.M, TON o -c90 59 Scotch 212-7R1B00 399 CATALOGS. Broadcasts, soundtracks. Personalities of Thir- TOK 5ÁC60 15 Soundgoard Record Pres KII / 59 Edmonton, Alta., Canada, T5E 6C8. ties, Forties. Box 225, New N.Y. BASF PAO I C-90 79 TDK L1800 513 York, 10028. TF BASF PRO II or rt1C-90 89 TDK LB -1 B00 6 31

BASF Studer 1 or 11c-90 59 AMPEX Grandmaster 1800n Reel 5 95 16mm Films, Videotapes. SAVINGS on reels, equipment. Big AGE SCOTCH Master II or IlIC-90 15 SCOTCH 207-1R-IB00 5 09 GOLDEN RADIO. Your best source for radio tapes, reels list. Urbanski, 8142 Kenneth, Chicago, IL 60652. 10-9 SCOTCH:. Master IC -90 69 BASF Studio 1800 R Reel 6 49 or cassettes. Box 25215-D, Portland, Oregon 97225. 9-0 All tapes can se assorted No mmmlum order Shipping 3 00 per order 0r rode lot Tree catalog plover 250 products. Including lowest prices on all Martell products All tapes 100 Addri guaranteed Free gal with every order 412-283.8621 MTh 9.4 GREAT ENTERTAINMENT. Enjoy old radio programs on TAPE WORLD. 220 Spnng St.. BNM, PA 16001 reels, cassettes, and 8 -track. Free catalog. Radio Memories, d Box 56-A, California, MD 20619. (215) 574-9600 140 is your rFUJI maxelÌ Sound Guard RENT RADIO SHOWS: Make your own copies or just listen. Great way to build your collection reasonably. Catalog $1 information Scotch *TUK ENPIFE refundable. OTR Rental, Box 1146, Ö Livermore. Ca. 94550 TF ® PICKERING cc 1=3=1=1 HOTLINE VINTAGE RADIO and T.V. -Lowest rates. Post Free, Trading, BLANK TAPES CARTRIDGES Video too; Signals, Box 5063 Station E., Edmonton, Alta. Can- for ada T5P 4C1. U.S. Inquiries. 81 RECORD CARE PRODUCTS Classified Ads. AT WHOLESALE PRICES YESTERDAYS RADIO ON TAPE. Reels -Cassettes. Quality Just ask for Call TOLL FREE or write for LOW PRICES Sound. Reliable Service. Giant catalog $1.00 refundable with 1 IN first order. ADVENTURES, Box 4822-A, Inglewood, California Carolynn 800/40/472 1783 90302. TF Approved by phone 1930-1962 RADIO PROGRAMS. Beats television!! Tapes. $1.00 hour! Established esteemed dealer, informative 200 McK's IrQPE page catalog $1.25. Cassette samples $2.00. AM Treasures. 111 S. COLLEGE AVE. PO BOX 5000 Box 192AU, Babylon, N.Y. 11702 TF CLAREMONT CA 91711 the audio advocate

Connecticut's Progressive Audio Store Over 350 Titles of Direct -Disc Acoustat Apt Holman Audionics Bryston SME Conrad -Johnson Keith Monks Record Clean- Cizek Cotter Cybele DAC DCM Time Polk Keith Monks ing 5 Listening Rooms Window Denon Grace Grado Hafler M -W 10-7, TH -F 10-8, 5 10-5 JR Levitation KMAL LS -3/5A M&K Gale Nakamichi All r pre -paid & insured. Signet Master Ch rK Express NAD Pyramid Quatre Rappaport Cizek Acoustat Tangent Sounds Concepts Supex .$ymdex Supex LS3/5A Yamaha Audiophile Accessories. H Ariston Onkyo TAKE 105 Whitney Ave., New Haven, CT 06511 (203) 777-1750 5 AUDIO Magnepan Hafler Apt Holman Grado Gulf Coast Fulton Cable Rega Houston and the é Audio Research ADC Mark Levinson/Threshold/GA.S./Apt/Holman/Hafler/Advent/Nakamichi/Dahlquist/ Magneplanar/KEF/Acoustat/KM Systems/DCM Time Window/Cizek/Snell/Denon/ Kljpsch/ Fidelity Research/Grace/Signet/Cotter/Ivie Analyzers AudioGancepts 505 Milburn Avenue Milburn, NJ 2200 SW Freeway at Greenbriar Houston, Texas 77098 713/527-0774 (201) 467-8988 Credit Cards Accepted Freight Prepaid in Continental USA t ', 22b Many amps can deliver pure sound. The Sansui AU -919 delivers pure music.

Today's audio engineering has reached the point Our DD/DC (Diamond Differential/DC)* circuitry where you can select among a number of afforda- provides the extremely high drive current necessary ble high -power amplifiers that have virtually no "total to use proper amounts of negative feedback to re- harmonic distortion." That's good. But THD measure- duce conventionally-measured THD (no more than ments only indicate an amplifier's response to a pure, 0.008%, 5Hz-20,000Hz into 8 ohms at 110 watts, continuously repeating, steady-state test signal (be- min. RMS) without compromising our extraordinary low, left). They don't tell you how the amp responds 200V/µSec slew rate, ensuring vanishingly -low TIM, to the never-repeating, rapidly -changing transient as well. The power amplifier frequency response waveforms of real music (below, right). And only an extends from zero Hz to 500,000Hz. amplifier designed to reproduce the demanding Since ultimate tonal quality depends on more dynamics of music signals can satisfy the critical than the power amplifier alone, Sansui also uses audiophile. An amp like the Sansui AU -919. its DD/DC* circuitry in the phono equalizer section- where current demands are also particularly high - to prevent TIM. ICL (input capacitorless) FET circuits are used throughout the AU -919, and a "jump switch" is provided that will let you run pure DC from the Aux. input to the output. Visit your authorized Sansui dealer today, and he'll show you a lot more that the AU -919 has to offer. Like twin -detector protection circuitry and our Penta -Power Supply system. Two -deck monitor- SINE WAVE DYNAMIC MUSIC SIGNALS ing/recording/dubbing facilities. And a high-performance ICL/FET pre-preamp for moving -coil Because low THD without low TIM is like cartridges. sound without music, the Sansui AU -919 is designed Then listen to the AU -919 with the most de- to respond well to both simple sine -wave test signals manding music find. You'll hear the way the and also to handle the jagged, pulsive edges you can music Like music. Not just like sound. required for realistic reproduction of music- should sound. without imparting that harsh, metallic quality known *The Diamond Differential/DC, Sansui's (patent pending) totally symetrical double ended circuitry with eight transistors, is named for its Diamond-shaped schematic as "transient intermodulation distortion" (TIM). representation. The Sansui AU -919 sounds better than con- SANSUI ELECTRONICS CORP. ventional amps because Sansui developed a Lyndhurst, New Jersey 07071 Gardena, Ca. 90247 is of Sansui Electric Co., Ltd., Tokyo, Japan unique (patent pending) circuit that capable Sansui Audio Europe S.A., Antwerp, Belgium achieving both low THD and low TIM simultaneously. In Canada: Electronic Distributors SQ/L

Enter No. 35 on Reader Service Card INVESTMENT LETTER

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Seek Dut Discwasher R products at dealers worldwide who are interested in preserving your discwasher, inc. 1407 N. Providence Rd. musical portfolio. Columbia, Missouri 6520-