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STEREO HI-FI PREVIEW ISSUE J:.Jvgin EERING the Aut Oritative Magazine About High Fidelity 1.181 ARY

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STEREO HI-FI PREVIEW ISSUE J:.Jvgin EERING the Aut Oritative Magazine About High Fidelity 1.181 ARY STEREO HI-FI PREVIEW ISSUE j:.jVGIN EERING the aut oritative magazine about high fidelity 1.181 ARY CDC L CALIFORNIA INSTITUTE : F PLUS: ABZ's ofa} 9 UDIO CLINIC RECORD 'LVIEWSayE TAPE GUIDE G -C www.americanradiohistory.comAmericanRadioHistory.Com Here's what's happening ... the only stereo compacts expand your range of musical enjoyment. with component circuitry, component features and com- 6. Electric guitar and microphone inputs and mixer ponent sound! provide you with a stereo showcase for your own talents. 1. Radically new Field Effect Transistors let you hear 7. Complete component controls, including dual Bass more stations more clearly. and Treble, let you tune the music to your taste and 2 Professional automatic turntable with magnetic car- room requirements. tridge just as used in expensive component systems. 8. Provision for extra speakers lets you bring great Scott 3. Exclusive automatic variable bandwidth gives amaz- sound to other rooms. ing clarity to AM broadcasts. 9. Stereo headphone output enables you to listen in 4. All silicon circuitry for rugged trouble -free perfor- privacy, without disturbing others. mance. $339.95 (Model 2502, illustrated. Other models start 5, Tape recorder and tape cartridge player connections at $249.95) Optional transparent dustcover, $22.95 0Scott....here SCOTT" innovation is a tradition For complete information, write: H.H. Scott, Inc., Dept 35-08 , 111 Powdermlll Foad, Maynard, Mass., 10754 Export: Scott International, Maynard, Mass. Another innovation from Scott, manufacturers of superb components, compacts, kits, speakers, and consoles. © copyright 1967, H.H. Scott, Inc. Check No. 100 on Reader Service Card www.americanradiohistory.comAmericanRadioHistory.Com August, 1967 Vol. 51, No. 8 Number 47 in a series of discussions by Electro -Voice engineers Successor to RAMO Est. 1911 AL7DI0 SANFORD L. CAHN Marketing Director LEE IRGANG C. G. MCPRouD, Publisher Circulation Development R. KENNETH BAXTER ARTHUR P. SALSBERG, Editor Production Manager ROBERT JACKSON Project Engineer, EDWARD TATNALL CANBY PETER RENICH MARY CLAFFEY Microphones Associate Editor Art Director Subscription Manager In recent years, hand-held microphones have Contributing Editors enjoyed an increase in popularity, especially in connection with the performance of popular HERMAN BURSTEIN JOSEPH GIOVANELLI music. Because of the unusual demands placed LEONARD FELDMAN ALEXANDER ROSNER on a microphone in this application, two new designs have been created to improve perfor- BERTRAM STANLEIGH mance. In addition to the new omnidirectional E -V Model 631, the cardioid Model 627 has been AUDIO ARTICLES developed to meet this specific need. Unlike other Electro -Voice dynamic cardioid micro- phones, the 627 is not classed as a Variable -D® Forum on Microphones & Headphones, Part 2 17 Arthur P. Salsberg microphone. The two ports to the rear of the diaphragm are symmetrically disposed quite The New NAB Magnetic Tape Standards, close to the front of the microphone. 2 22 Burstein Part Herman The result is a smooth cardioid pattern with a front -to -back ratio of about 18 db. The prox- imity effect that is inevitable with this class of microphone has proved useful in giving "body" ANNUAL PRODUCT and depth to young voices when used quite PREVIEW SECTION close. However, this "intimate" microphone technique normally gives rise to problems of blasting and popping, so special attention was Amplifiers 24 paid to suppression of these effects. Preamplifiers 30 Diaphragm and voice coil suspension was im- Tuners 31 proved to eliminate "bottoming" under extreme 34 pressures, and a multi -stage pop filter is em- Receivers ployed, using Acoustifoam® plus an extended Modular Systems 42 windscreen. Pop suppression exceeds that of Record Changers 43 microphones using much larger ball screens, yet size remains small so that the microphone Turntables and Arms 46 does not hide the performer. 51 Phono Cartridges An unusual approach to elimination of shock Loudspeaker Mechanisms 54 and handling noise increases the usefulness Loudspeaker Systems 58 of the microphone for hand-held applications. Typical designs have used the body of the Tape Recorders 68 microphone as a resonant cavity for control of Video Tape Recorders 76 bass response. This makes it difficult to shock 78 mount the microphone element. Any movement Microphones of the microphone element as a whole changes Headphones 83 the effective size of the back cavity. This intro- Miscellaneous 85 duces pressure changes that result in noise as the element moves in its mount. Directory of Manufacturers 87 To eliminate this problem, the 627 uses a separate rear cavity cup, attached directly to the back of the element, and independent of AUDIO IN GENERAL the microphone body. This permits very effec- tive shock mounting of the element with greatly reduced handling noise. It also provides in- Audioclinic 2 Joseph Giovanelli creased protection to the element. The use of 4 the separate cavity also permits a more effec- ABZ's of FM Leonard Feldman tive rear seal which insures unchanging response Audio ETC. 8 Edward Tatnall Canby for an extended period. Tape Guide 10 Herman Burstein Since the die-cast body of the microphone Letters 12 serves primarily as a handle it was possible to 14 achieve good physical balance without excessive Editor's Review weight. No sealing is needed around the on -off Record Review 89 switch, thus eliminating another possibility for Classified 90 change in response. Advertisers' Index 92 Careful attention to design details has resulted e in a microphone uniquely suited for the rugged use intended. Initial field testing indicates that e ABC a every major design goal has been met in this AUDIO (title registered U. S. Pat. Off.) is published monthly by North American Publishing Co., I. J. Borowsky, President; Frank Nemeyer, C. G. new product. McProud, and Arthur Sitner, Vice Presidents. Subscription rates-U. S. Possessions, Canada, and Mexico, $5.00 for one year; $9.00 for two years; For technical data on any E -V product, write: all other countries, $6.00 per year. Printed in U.S.A. at Philadelphia, Pa. ELECTRO -VOICE, INC., Dept. 873A All rights reserved. Entire contents copyrighted 1967 by North American 602 Cecil SL, Buchanan, Michigan 49107 Publishing Co. Second class postage paid at Philadelphia, Pa., and addi- tional mailing offices. REGIONAL SALES OFFICES: Sanford L. Cahn, 663 Fifth Ave., New York, N. Y. 10022; (212) 753-8824. Louis Weber, 2927 W. Touhy Ave., Chicago, III. 60645 (312) 743-1206. Jay Martin, 9350 Wilshire Blvd., Beverly Hills, Calif.; (213) 273-1495. REPRESENTATIVE: Warren Birkenhead, Inc., No. 25, 2-chome, Shiba Hama- aleetiaict matsu -cho, Minato-ku, Tokyo, Japan. SETTING NEW STANDARDS IN SOUND AUDIO, Editorial and Publishing Offices, 134 N. 13th St., Philadelphia, Pa. 19107 Postmaster: Send Form 3579 to the above address. Check No. 103 on Reader Service Card AUDIO AUGUST 1967 1 www.americanradiohistory.comAmericanRadioHistory.Com Coming in AUDIOCLINIC JOSEPH GIOVANELLI ing versus a non -shorting switch, con- September a or question on If you have problem sider a SPDT rotary switch. If this audio, write to Mr. Joseph Giovanelli switch is of the so-called, non -shorting at AUDIO, 134 North Thirteenth Street, variety, following will happen when FEATURE ARTICLES: Philadelphia, Pa. 19107. All letters are the answered. Please enclose a stamped, the switch is moved from one position Build a Solid -State Limiter- self-addressed envelope. to the other. As the shaft moves, the wiper will leave the contact on which Wayne B. Denny presents it was resting. It will move a short dis- plans for building a Power Output Versus Impedance tance before touching the remaining transistorized limiter to Q. When an amplifier is rated at, say contact of the switch. 100 The so-called shorting type has a improve tape recording Watts, 4 Ohms, what will the same amplifier's wattage be at an impedance similar action. Here, however, as the quality. of 15 Ohms?-Alfred R. Halpern, Ot- shaft turns, the contacting arm, or tawa, Ontario, Canada. wiper, starts to leave the terminal on Sound Reinforcement- A. The question of power ratings of which it has been resting. Before leav- Martin Borish examines the amplifiers versus their impedance in ing, it has touched the remaining con- a need for electronic sound Ohms is difficult to give in terms of a tact on the switch. Thus, for brief specific answer. If the amplifier under period during the time the shaft is reinforcement in concert consideration is a tube -operated de- turning, both contacts are energized. If halls, using a practical vice, the power output will be substan- there was a third contact associated example of how it is tially unchanged because you can select with the switch, a similar shorting ac- the proper impedance match from an tion would take place between the sec- accomplished. output transformer tap. ond and third contact; the first contact The solid-state amplifier, however, would not be involved in the action. The New NAB Magnetic Tape does not have a similar selection of out- Though many people refer to the Standards-Herman Burstein put taps available. It has one "basic" above switch as a shorting switch, it is discusses equalization curves, impedance. When the impedance of more properly called a "make -before - comparing NAB and RIAA the load (the device to which the out- break" switch. put of the amplifier is connected) is reproducing characteristics A true shorting switch is something above or below this impedance, the quite different. To illustrate, assume for magnetic tape. power output will decrease from what that this component is a single pole, appears at maximum efficiency-a cor- four -position unit. In position one, the EQUIPMENT PROFILES: rect impedance match. The amount of wiper (contacting arm) touches one power loss is partially dependent upon switch contact. In position . two, the the amount of feedback employed Ortofon SL15T stereo phono in wiper is in contact with the first and the amplifier.
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