Peavey ACM-1 User's Manual
Contents
1. SPECIFICATIONS Element Type Electret Condenser Polar Pattern Unidirectional Cardioid Front to back Rejection 20 GB typical Impedance Low approximately 500 ohms balanced Frequency Response 50 to 20 000 Hz Sensitivity Output Power Level 52 dB 0 dB 1 mW Pascal Open Circuit Voltage 67 0 dB 1 Volt dyne cm Signal to Noise Ratio Approximately 64 dB re 1 Pascal Maximum SPL 124 dB at 1 kHz Power Requirements 7 52 volt phantom Phasing Positive inward acoustic pressure at diaphragm produces positive voltage at pin 2 Finish Low gloss black Cable 25 miniature 2 conductor shielded Connector Microphone Tiny QG Output Module 3 pin XLR type Dimensions See line drawing Weight Microphone only 0 4 oz 11 gm With Cable 2 6 oz 73 gm Output Module 2 oz 57 gm Furnished Accessories Hanging adaptor foam windscreen output module mounting clips cable clamps FEATURES e Back electret condenser element e Small unobtrusive design e Unidirectional polar response e Smooth wide range frequency response e 25 miniature cable for long drops e 7 52 volt phantom capability FERVEN ARCHITECTURAL ACOUSTICSO ACM 1 Miniature Unidirectional Microphone SPECIFICATIONS DESCRIPTION The ACM 1 is a very small unidirectional condenser microphone designed primarily to be suspended over choirs instrumental ensembles or stage areas for so2. 22 6 E KA _ v 0 4 62 117 4 i 0 0 E SES y HANGING SUGGESTIONS The ACM 1 is designed to be suspended by its attached cable For ease in properly securing the cable to the supporting structure two small cable clamps are provided NOTE The output module is intended to be connected to the cable attached to the ACM Longer cables between the microphone and output module can result in performance deterioration When first hung the microphone will tend to rotate as the cable relaxes lt s suggested that the unit first be hung facing away from the desired position After 24 hours it should have turned to about the desired direction Small additional adjustments should be made by simply rotating the microphone slightly in the hanging adaptor ARCHITECTURAL amp ENGINEERING SPECIFICATIONS The microphone shall be a back electret condenser type with a frequency response of 50 Hz to 20 kHz The microphone shall have a cardioid polar pattern with a rear response which is typically 20 dB from the front response The microphone shall have an output power level of 52 dBm where 0 dB 1 milliwatt per Pascal and a nominal impedance of 500 ohms when connected to its output module The microphone shall have a low gloss black finish Microphone dimensions shall be 645 diameter by 1 38 long with an attached 25 cable 0 10 in diameter The cable shall be terminated with a mi
3. niature 3 pin connector to interface with the output module electronics package The output module shall have a low gloss black finish and be 0 89 in diameter by 4 62 long The diameter at the output connector end shall be reduced to permit direct connection with a panel mount input connector of the 3 pin XLR type The output module shall properly interface the microphone with any 7 to 52 volt phantom supply A vinyl coated hanging adaptor shall be included for proper aiming of the microphone when suspended by its cable The microphone shall be an Architectural Acoustics ACM 1 HESBVEY ARCHITECTURAL ACOUSTICS ONE YEAR LIMITED WARRANT Y Note For details refer to the warranty statment Copies of this statement may be obtained by contacting Peavey Electronics Corporation PO Box 2898 Meridian Mississippi 39302 2898 Features and specifications subject to change without notice A Division of Peavey Electronics Corporation 711 A Street P O Box 2898 Meridian MS 39302 2898 601 483 5376 Telex 504115 Fax 601 484 4278 1990 80301306 Printed in U S A 8 90
4. ture of the performing group the configuration of the performance area the auditorium and the sound system characteristics can all be important considerations In general the microphone s are hung somewhat above and in front of downstage from the front row of performers The microphones are usually aimed to point slightly above the nearest performers If the ensemble is large enough to require more than one microphone for good balance the 3 to 1 rule should be observed This simply means that the spacing between adjacent microphones should be at least three times the distance to the nearest performers for best overall sound quality Some experimentation during rehear sals generally proves very helpful in determining the optimum hanging locations For praperly hanging the ACM 1 the formed wire hanging adaptor should be used The microphone s cable is threaded through the coils with the large coils toward the microphone so that it is retained by each of the three coiled suspension areas The cable end of the microphone is then inserted into the large coils until the projecting portion is firmly engaged For final aiming the wire adaptor may be bent at the angled section as needed 40 dB per division 00 Hz 200 Hz 500 Hz 5kHz 10KHz FREQUENCY RESPONSE 1 38 3 5 645 16 4 DIMENSIONS INCHES MILLIMETERS 0 735 18 7 0 89
5. und reinforcement and or recording The small size allows one or more ACM 1 mics to be hung or flown in virtually any application with no distraction or sight line obstruction It can also be easily concealed in scenery or props when desired The very uniform cardioid polar response is highly effective in suppressing feedback and unwanted sounds as well as in minimizing undesirable coloration of off axis sources Since the ACM 1 is primarily designed to be hung somewhat above the projection axis of the performer a subtly rising high frequency response characteristic is incorporated into the design This characteristic compensates for the high frequency roll off innerent in this kind of pickup A formed wire hanging adaptor is supplied to facilitate proper positioning of the microphone when suspended by The very small diameter cable is quite inconspicuous in hanging applications but is well shielded and rugged enough to reliably support the ACM 1 and its hanging adaptor The cable plugs into a compact cylindrical Output Module which connects to the usual XLR type 3 pin microphone cable connector Power is obtained from any phantom source supplying from 7 to 52 volts APPLICATION NOTES CHOOSING POSITION When hanging one or more ACM 1 s to reproduce a choir or instrumental group the specific positioning for optimum sound quality balance and feedback control depends on many factors The size and na
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