Sound Reinforcement
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Minimoog Model D Manual
3 IMPORTANT SAFETY INSTRUCTIONS WARNING - WHEN USING ELECTRIC PRODUCTS, THESE BASIC PRECAUTIONS SHOULD ALWAYS BE FOLLOWED. 1. Read all the instructions before using the product. 2. Do not use this product near water - for example, near a bathtub, washbowl, kitchen sink, in a wet basement, or near a swimming pool or the like. 3. This product, in combination with an amplifier and headphones or speakers, may be capable of producing sound levels that could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a level that is uncomfortable. 4. The product should be located so that its location does not interfere with its proper ventilation. 5. The product should be located away from heat sources such as radiators, heat registers, or other products that produce heat. No naked flame sources (such as candles, lighters, etc.) should be placed near this product. Do not operate in direct sunlight. 6. The product should be connected to a power supply only of the type described in the operating instructions or as marked on the product. 7. The power supply cord of the product should be unplugged from the outlet when left unused for a long period of time or during lightning storms. 8. Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings. There are no user serviceable parts inside. Refer all servicing to qualified personnel only. NOTE: This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC rules. -
Acoustical Engineering
National Aeronautics and Space Administration Engineering is Out of This World! Acoustical Engineering NASA is developing a new rocket called the Space Launch System, or SLS. The SLS will be able to carry astronauts and materials, known as payloads. Acoustical engineers are helping to build the SLS. Sound is a vibration. A vibration is a rapid motion of an object back and forth. Hold a piece of paper up right in front of your lips. Talk or sing into the paper. What do you feel? What do you think is causing the vibration? If too much noise, or acoustical loading, is ! caused by air passing over the SLS rocket, the vehicle could be damaged by the vibration! NAME: (Continued from front) Typical Sound Levels in Decibels (dB) Experiment with the paper. 130 — Jet takeoff Does talking louder or softer change the vibration? 120 — Pain threshold 110 — Car horn 100 — Motorcycle Is the vibration affected by the pitch of your voice? (Hint: Pitch is how deep or 90 — Power lawn mower ! high the sound is.) 80 — Vacuum cleaner 70 — Street traffic —Working area on ISS (65 db) Change the angle of the paper. What 60 — Normal conversation happens? 50 — Rain 40 — Library noise Why do you think NASA hires acoustical 30 — Purring cat engineers? (Hint: Think about how loud 20 — Rustling leaves rockets are!) 10 — Breathing 0 — Hearing Threshold How do you think the noise on an airplane compares to the noise on a rocket? Hearing protection is recommended at ! 85 decibels. NASA is currently researching ways to reduce the noise made by airplanes. -
Analog Synthesizer So There Is No Need for Soldering.)
Assembly time: Approximately 20 minutes (The electric circuit comes pre-assembled, Analog Synthesizer so there is no need for soldering.) How to Assemble and Use the Supplement Things you will need Parts in the Kit Phillips screwdriver (No. 1) AA alkaline batteries (4 new) Knobs (5) * Please note that rechargeable NiCd batteries and non-rechargeable Oxyride and nickel-based batteries should not be Washer head screws (7) used due to a high risk of components melting or fire breaking out with these batteries because of accidental short-circuiting or the like. Additionally, because this supplement was designed based on operation at 6 V, it may not operate in the desired way due to an excess of or a deficiency in voltage with the above batteries. Incidentally, most rechargeable batteries provide 1.2 V and Screws (3) Oxyride batteries, 1.7 V. Main unit Cellophane tape Notes for tightening screws The types of screws used for the supplement are those that carve grooves into the plastic as they are inserted (self-threading). The screwdriver most suited to tightening the screws is the #1 JIS screwdriver. When tightening screws, Circuit board firmly press the provided screwdriver straight against the screws and turn. It is said that 70 percent of the force applied is used for pushing against the screw and 30 percent for turning it. Precision screwdrivers are hard to turn, so use a small screwdriver with a grip diameter of about 2 cm. Electrode Slider panel Speaker Cut out the cardboard (Wrapped in cardboard.) case to use as a back cover. -
Standing Waves and Sound
Standing Waves and Sound Waves are vibrations (jiggles) that move through a material Frequency: how often a piece of material in the wave moves back and forth. Waves can be longitudinal (back-and- forth motion) or transverse (up-and- down motion). When a wave is caught in between walls, it will bounce back and forth to create a standing wave, but only if its frequency is just right! Sound is a longitudinal wave that moves through air and other materials. In a sound wave the molecules jiggle back and forth, getting closer together and further apart. Work with a partner! Take turns being the “wall” (hold end steady) and the slinky mover. Making Waves with a Slinky 1. Each of you should hold one end of the slinky. Stand far enough apart that the slinky is stretched. 2. Try making a transverse wave pulse by having one partner move a slinky end up and down while the other holds their end fixed. What happens to the wave pulse when it reaches the fixed end of the slinky? Does it return upside down or the same way up? Try moving the end up and down faster: Does the wave pulse get narrower or wider? Does the wave pulse reach the other partner noticeably faster? 3. Without moving further apart, pull the slinky tighter, so it is more stretched (scrunch up some of the slinky in your hand). Make a transverse wave pulse again. Does the wave pulse reach the end faster or slower if the slinky is more stretched? 4. Try making a longitudinal wave pulse by folding some of the slinky into your hand and then letting go. -
Nuclear Acoustic Resonance Investigations of the Longitudinal and Transverse Electron-Lattice Interaction in Transition Metals and Alloys V
NUCLEAR ACOUSTIC RESONANCE INVESTIGATIONS OF THE LONGITUDINAL AND TRANSVERSE ELECTRON-LATTICE INTERACTION IN TRANSITION METALS AND ALLOYS V. Müller, G. Schanz, E.-J. Unterhorst, D. Maurer To cite this version: V. Müller, G. Schanz, E.-J. Unterhorst, D. Maurer. NUCLEAR ACOUSTIC RESONANCE INVES- TIGATIONS OF THE LONGITUDINAL AND TRANSVERSE ELECTRON-LATTICE INTERAC- TION IN TRANSITION METALS AND ALLOYS. Journal de Physique Colloques, 1981, 42 (C6), pp.C6-389-C6-391. 10.1051/jphyscol:19816113. jpa-00221175 HAL Id: jpa-00221175 https://hal.archives-ouvertes.fr/jpa-00221175 Submitted on 1 Jan 1981 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. JOURNAL DE PHYSIQUE CoZZoque C6, suppZe'ment au no 22, Tome 42, de'cembre 1981 page C6-389 NUCLEAR ACOUSTIC RESONANCE INVESTIGATIONS OF THE LONGITUDINAL AND TRANSVERSE ELECTRON-LATTICE INTERACTION IN TRANSITION METALS AND ALLOYS V. Miiller, G. Schanz, E.-J. Unterhorst and D. Maurer &eie Universit8G Berlin, Fachbereich Physik, Kiinigin-Luise-Str.28-30, 0-1000 Berlin 33, Gemany Abstract.- In metals the conduction electrons contribute significantly to the acoustic-wave-induced electric-field-gradient-tensor (DEFG) at the nuclear positions. Since nuclear electric quadrupole coupling to the DEFG is sensi- tive to acoustic shear modes only, nuclear acoustic resonance (NAR) is a par- ticularly useful tool in studying the coup1 ing of electrons to shear modes without being affected by volume dilatations. -
Blues Bass String Recommendations
Blues Bass String Recommendations Barr is sceptically flavoursome after orientating Orson bivouac his eyas ahead. Indo-Iranian Stearn rustle or damage some overstuffssnow-on-the-mountain immitigably or perceptively, clarifies any however conservatoriums. iatrogenic Berkeley screeches placidly or revenge. Skippy remains Eocene after Salomo As they deliver balanced string bass strings with coating on string Victor Wooten uses super light strings. All the strings listed above will make your bass sound great. This should appeal to a wide range of players, especially those playing modern styles. Blue Steel bass strings. However, the bass guitar has a different musical sound. Double bass Wikipedia. Can you tell us what in particular you find suspect? Some players perform with the sides of one, two, or three fingers, especially for walking basslines and slow tempo ballads, because this is purported to create a stronger and more solid tone. But certainly more difficult on some than others. They are made so that the acoustic instrument musicians feel just as appreciated as they need to be. What are the best bass strings? The good news though is that you only need to know the key points to appreciate which guitar strings will work best for you. Ernie Ball strings, in addition to hundreds of thousands of musicians the world over. For the first week or so on my XLs or boomers I find them to be harsher on my fingers till they are broken in. Having said that, if you want to experiment, then you could try halfwound strings. DR Strings is not just about being colorful. -
White Paper Utopia & Elear White Paper
UTOPIA & ELEAR WHITE PAPER UTOPIA & ELEAR WHITE PAPER Focal’s DNA is, by essence, the com- bination of the absolute acoustic quest, total control of the manufacturing process and the “je ne sais quoi” brought by the com- pany’s designers into every single product. The extreme care paid to each detail, from the early stages of R&D, to utilizing the latest manufactu- ring techniques and thorough quality control sums up our philosophy. Since the very beginning, Focal has brought major innovations that pushed the limits of loudspeakers and their performance, thanks to the flagship pro- jects within the brand such as, Utopia III, Utopia Be car audio kits or SM9 studio monitors. During the development of these flagship products in each of their respective divisions, the amount of time and resources devoted to the research phase far ou- tweighed the actual production. These products were “born” thanks to this approach in order to reach the ultimate acoustic truth. > Grande Utopia EM > SM9 > Ultima kit UTOPIA & ELEAR WHITE PAPER However, to keep on innovating and to reach such a target requires a different way of thinking. We needed to be able to capitalize on our core know-how and past experiences, but also to challenge traditional thinking of what is possible and what could be achieved. This strategy resulted in the creation of numerous > "W" composite exclusive technology, such as “W” composite sandwich sandwich cone cones or IAL tweeters that brought major improvements in term of acoustic translation of the original audio signal. Before starting on the Focal flagship headphone project, we already had the relevant background with our in-house knowledge, thanks to the well-received Spirit headphone line. -
Perceptual Fusion of Noise and Complex Tone by Means of Amplitude Modulation
Perceptual Fusion of Noise and Complex Tone by Means of Amplitude Modulation Pär Johansson Master’s Thesis Department of Speech, Music and Hearing The Royal Institute of Technology, Stockholm Abstract This report investigates pulse-synchronised amplitude modulation as a method for perceptual fusion of noise and tone. It is shown that when the noise is amplitude modulated by the waveform envelope of the tone, higher amplitude modulation depth yields stronger fusion. In addition, the evidence suggests that fusion remains constant for tone frequencies from 150 to at least 600 Hz. Sammanfattning Det är numera välkänt att olika former av brus är en väsentlig del av klangfärgen hos de flesta akustiska instrument, vilket ofta förbises vid konstruktionen av elektroniska och digitala musik- instrument. Forskning inom detta område har visat att bruset tillför en ökad realism till syntetiserade instrument, men också att det inte är tillräckligt att bara mixa en ton med vitt brus för att vi skall uppfatta de båda komponenterna som en sammansatt klang – en lyckad sammansmältning eller perceptuell fusion kräver att bruset och tonen är korrelerade. Ett sätt att åstadkomma detta är att amplitudmodulera bruset med tonens frekvens. Detta är ett fenomen som uppstår naturligt i bl a röst, blås- och stråkinstrument. Denna uppsats behandlar dels hur modulationsdjupet påverkar fusionen, dels hur fusionen varierar med tonens frekvens. En enkel modell av ett instrument med en bruskälla skapades, där tonens frekvens och ljudnivå, brusets ljudnivå och modulationsdjupet kunde variera. För att pröva hypoteserna 1) fusionen ökar med modulationsdjupet och 2) fusionen minskar med frekvensen, gjordes lyssnartest vid frekvenserna 150, 300 och 600 Hz. -
Owner's Manual
KC-80 Owner’s Manual Keyboard Amplifier KC-80 KC-200 KC-200 Owner’s Manual 取扱説明書 Bedienungsanleitung Mode d’emploi Manuale dell'utente Manual del usuario Manual do Proprietário Gebruikershandleiding WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture. CAUTION The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the RISK OF ELECTRIC SHOCK DO NOT OPEN presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to ATTENTION: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR constitute a risk of electric shock to persons. CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, The exclamation point within an equilateral triangle is DO NOT REMOVE COVER (OR BACK). intended to alert the user to the presence of important NO USER-SERVICEABLE PARTS INSIDE. operating and maintenance (servicing) instructions in the literature accompanying the product. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS. IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS WARNING - When using electric products, basic precautions should always be followed, including the following: 1. Read these instructions. 10. Protect the power cord from being walked on or pinched 2. Keep these instructions. particularly at plugs, convenience receptacles, and the 3. Heed all warnings. point where they exit from the apparatus. 4. Follow all instructions. 11. Only use attachments/accessories specified 5. Do not use this apparatus near water. by the manufacturer. 6. Clean only with a dry cloth. -
3. Intercultural Tension in Music by Chaya Czernowin and Isabel Mundry: Variations on Identity and Musical Meaning
V. New Music and Beyond: Music-Historical and Cultural Entanglements 385 3. Intercultural Tension in Music by Chaya Czernowin and Isabel Mundry: Variations on Identity and Musical Meaning A phenomenon crucial for the perception of new music, and which is featured prominently in Helmut Lachenmann’s sound typology, is the transition between structure and texture: the more information is conveyed at once in a musical context, the more it is perceived in terms of “global” characteristics – that is, structure (conceived as an interaction of individual sound elements or “families”) morphs into texture (in which one global characteristic dominates) – and the reverse process is, of course, equally relevant. Although this principle was particularly well- known and much explored in “sound composition” during the 1960s, it plays a certain role in listening to almost any polyphonic or multi-layered music. Complex and dazzling musical strat- ification was derived by many composers in the twentieth century from the legacy of Romantic orchestral magic (→ VI.1). Such a “dialogue” between layers can give rise to a morphological viv- idness that communicates itself directly, even without the framework of tonal harmony. In the music that emerged from the fault lines of cultural globalization from the end of the nineteenth century, it was, as we have seen, a much-used procedure to conceptualize the differ- ences between cultural idioms in the form of such a layered structure: groups of instruments and/or musical timbres were often arranged “culturally” (and usually differing composition- al techniques applied to such groups mirrored this cultural segregation). In Tan Dun’s Ghost Opera (1994), the string quartet was culturally “identified” by the C# minor prelude from volume 1 of Bach’s Well-Tempered Clavier, the Chinese pipa by the Chinese folk song Xiao bai cai. -
KEYBOARD AMP/PA SYSTEM KX1200 Technical Specifications Technical Version 1.0
Technical Specifications ENGLISH Version 1.0 May 2001 KEYBOARD AMP/PA SYSTEM KX1200 SYSTEM AMP/PA KEYBOARD KEYBOARD AMP/PA SYSTEM Ultra-flexible 120-Watt, 4-channel keyboard amplifier with effects path and microphone input KX1200 s Powerful 120-Watt (RMS) keyboard amplifier with built-in 3-way bass reflex cabinet s Special custom-made 15" woofer, 5" midrange speaker plus tweeter s 4-channel operation with line inputs and dedicated volume controls s Effects/monitor path on all 4 channels s Additional XLR input on channel 1 for microphone connection s Tape input for line-level signals (e.g. CD player, drum computer) s Tape output for recording and live applications s Balanced direct output on XLR connector for easy connection to a mixing console s Main Output for connection of additional power amps s Active 4-band EQ with that excellent sound s Short-circuit-proof and indestructible power amp with 2-stage fan s Master Volume control and stereo headphones output s Extremely rugged construction ensures long life even under the most demanding conditions s Generously dimensioned power supply for excellent pulse response s Manufactured under ISO9000 certified management system 2 SPECIFICATIONS AUDIO INPUTS Line In 1 - 4 1/4" TRS Input impedance approx. 30 kW balanced FX Return 1/4" stereo jack Input impedance approx. 20 kW unbalanced Tape In RCA connector Input impedance approx. 30 kW unbalanced Mic 1 XLR connector Input impedance approx. 2 kW balanced AUDIO OUTPUTS Headphones connector 1/4" stereo jack Main Out 1/4" stereo jack Output impedance approx.100 W unbalanced D.I. -
1977 Catalog Martin Archery Inc
1977 CATALOG MARTIN ARCHERY INC. ROUTE 5. BOX 127, WALLA WALLA WASHINGTON 99362 U.S.A. AREA 509 529-2554 INDEX Accessory Case .......... ... ..... 70 Game Bag ........ .... ........ 74 Armguards ........ .... ....... 15 Glove Powder ...... .. ... ... ..... 36 Arromcter ................... .. 31 Gloves ........................ 14 Arrows .................... 7,8, 9 Ground Quivers ..... ... ... .... .. 16 Arrow Boxes .......... ... .. 71 Arrow Case ............ .. ... 70 Insect Repellent ... .... .... .. .. 57 Arrow Clips .................. 67 Arrow Holders ....... .. .... ... 49 Kisser Buttons .... ............ .. 41 Arrow Numbers .. .... ...... ... 58 Knives ...... ... .. .... .... ... 74 Arrow Rests ............ ...... 35 Kwik Knurl ................. .. 13 Arrow Straightener ......... .... 46 Lacquer .... .. ........ ...... 58, 76 Backpacks ............. ... ... .. 75 Lure .............. .. .. ... .... 50 Belt ............... ... ..... 18 Berger Button ........ ... ........ 35 Matts, Easel ......... ..... ... .. 63 Blun ts .............. ......... 13 Books ............... ..... 68 69 Nocks ......... .. .... .... ... 66 Bows ................... .... 19-30 Nocking Points ... ............. .. 48 Bow Cases ......... ...... 70, 71 Bow Covers ................. 53 Points: Field, Target, Blunts ......... 13 Bow Levels .................. .40 Pouch ............... ... .... 34 Bow Saddles .................. 34 Powder Pouch ............ ....... 34 Bowslings .......... .... .. ... 34 Bow Squares........ ...... .... 46 Buwstri ngs .................