Model SM12A User Guide
Contents
1. 67 0 dBV Pa 45 mV ee ere areas 1 Pa 94 dB SPL Hum Sensitivity typical 38 4 dB equivalent SPL in a 1 millioersted field Phasing Positive pressure on diaphragm produces positive voltage on pin 2 of microphone connector Connector Male XLR audio connector TA3M Receiver Type Dynamic Frequency Response 70 to 12 000 Hz Impedance 2 000 ohms at 1 kHz 200 ohms cartridge with matching transformer in phone plug Output Level 105 dB SPL with 1 4V at 1 kHz 1 0 mW into 2 cc cavity Phasing Positive voltage on phone plug tip produces positive pres sure in ear tube Connector Phone plug contains matching 200 2 000 ohm transformer GENERAL SPECIFICATIONS Cable Non detachable 1 5m 5 ft four conductor shielded plastic jacketed additional 762 mm 2 5 ft two conduc tor receiver cable attached to micorphone connector Case Black thermoplastic microphone and pivot housing anod ized aluminum end caps stainless steel grille ear tube and boom Dimensions See Figure 4 Net Weight 84 grams 3 ounces less cable and connectors Packaged Weight 978 grams 2 lb 2 1 2 oz CERTIFICATION Eligible to bear CE Marking Conforms to European EMC Di rective 89 336 EEC Meets applicable tests and perfor mance criteria in European Standard EN55103 1996 parts 1 and 2 for residential E1 and light industrial E2 environ ments ACCESSORIES AND REPLACEMENT PARTS The following furnished accessories an2. 19 to 300 ohms The microphone output shall be 66 0 dB where 0 dB 1 milliwatt per 10 microbars The receiver shall be a dynamic type with a frequency re sponse of 70 to 12 000 Hz The receiver shall be sup plied with an integral connector mounted matching transformer designed with an impedance of 2 000 ohms The microphone with receiver shall be a head worn type and shall be provided with a 1 5m 5 ft non detachable four conductor two conductor shielded cable with a pro fessional three pin audio connector designed to mate with Cannon XL series 3 Pin Mini Connector TA3M or equiva lent connectors An additional 762 mm 2 5 ft cable length shall be provided between microphone and receiver phone plug connectors The microphone shall also be provided with a headband two connector belt clips and a foam wind screen The overall dimensions of the microphone shall be 203 mm 8 in in length and 44 5 mm 1 3 4 in in maximum height pivot housing The microphone housing shall be 15 9 mm 5 8 in in diameter and 14 mm 9 16 in in height SHURE Incorporated Web Address http www shure com 222 Hartrey Avenue Evanston IL 60202 3696 U S A Phone 847 866 2200 Fax 847 866 2279 In Europe Phone 49 7131 72140 Fax 49 7131 721414 In Asia Phone 852 2893 4290 Fax 852 2893 4055 Elsewhere Phone 847 866 2200 Fax 847 866 2585
3. ERATION As supplied the microphone is positioned on the left side as shown in Figure 1 For right side usage see photo re move the retaining clip and attach it to the other unused hole in the headband arm so the screw is at the top CLEANING THE REVEIVER TIP A decrease in receiver output may be due to clogging of the receiver tip The tip may be cleaned by removing it from the ear tube and inserting a toothpick or similar device through the tip hole If clogging is apparent in the ear tube carefully remove the obstruction from the ear tube tip CAUTION Do not disturb the foam damping material lo cated just inside the ear tube tip WARNING Sustained high volume levels in conjunction with a tightly fitting receiver tip may adversely affect the user s hearing Make certain the volume is set to a confortable listening level and position the re ceiver tip at the entrance of the ear ASSEMBLY Headband Pivot Adjustment i Kno Headband Arm Retaining Clip Pivot Housing Receiver Tip Microphone SM12A POSITIONED FOR LEFT SIDE OPERATION FIGURE 1 1 Position the lower headband arms perpendicular to the headband 2 Snap the microphone pivot housing into the retaining clip with the pivot adjustment knob upward and the mi crophone toward the front Printed in U S A 3 Loosen the pivot adjustment knob position the boom so that the microphone is near where the side of the mouth will
4. SHURE Model SM12A User Guide HEAD WORN MICROPHONE WITH RECEIVER i GENERAL The Shure Model SM12A Professional Head Worn Micro phone with Receiver is a low impedance unidirectional dy namic microphone with an integral earphone assembly The SM12A offers convenient hands free operation for sports and news announcing interviewing and intercommunica tion systems and for special events remote broadcasting A close talking unit the SM12A can be used under noisy con ditions without loss or masking of voice signals The SM12A and the supplied dual spring steel headband is rugged and reliable A miniature windscreen to protect against wind noise and explosive breath sounds and two connector belt clips are also supplied Features e Close talk operation and unidirectional polar pattern for effective noise reduction e Smooth natural voice frequency response e Locking adjustment knob permits boom to pivot 20 in any direction e Boom length adjustment through 89 mm 3 1 2 in range e Built in receiver protection circuit automatically avoids excessive sound pressure level e Receiver ear tube adjustable through 55 arc e Light weight plus dual headband eliminate user fatigue e Does not interfere with eyeglasses e Ruggedly constructed of stainless steel aluminum and high impact thermoplastic e Convenient secure clips attach connectors to belt or clothing 2003 Shure Incorporated 27B2325 CC RIGHT SIDE OP
5. SM12A earphone receiver to be connected to the speaker output of a power amplifier with an output of up to 200 watts into 4 ohms The volume control need not be connected di rectly to the power amplifier It can also be connected to an unused phone jack on a working stage monitor WARNING Although the SM12A s receiver circuit is protected against excessive level it is capable of an output of over 121 dB SPL sufficient to cause hearing damage with prolonged exposure Always take care to turn the vol ume control on this circuit all the way down before insert ing the earpiece into your ear Then turn the control up gradually until a confortable listening level is reached RESISTOR POTENTIOMETER K 1 K 1W 2 2K 1W 25 INPUT el OUTPUT FROM TO AMPL SM12A EARPHONE VOLUME CONTROL FIGURE 6 PARTS LIST IE EE T Two circuit phone jacks E OEE EE EE EA EATE Resistor 2 2k 1W 0 EREE E Potentiometer 25k 1W or larger E E dat eee EEE EEEE Plastic or metal box ETT ee eee ee aetna es Connecting leads ARCHITECT S SPECIFICATIONS The microphone with receiver shall be the Shure Model SM12A or equivalent The microphone shall be a moving coil dynamic type with a frequency response of 50 to 15 000 Hz The unit shall have a cardioid polar characteris tic The cancellation at the rear shall be 15 to 20 dB The mi crophone shall be low impedance with a rated impedance of 150 ohms for connection to microphone inputs rated at
6. be and tighten the pivot adjustment knob 4 Place the assembled microphone on the user s head and pull the headband arms downward until they rest against the head just over the ears Position the receiver tip at the entrance to the ear Make certain cable is free of receiver ear tube 5 Loosen the pivot adjustment knob and position the mi crophone as close as possible to the corner of the mouth For optimum close talking operation the micro phone should be less than 25 mm 1 in from the corner of the mouth Be sure to position the microphone at the corner not the center of the mouth to eliminate explo sive breath sounds pop Tighten the adjustment knob 6 Snap the microphone connector belt clip over the groove in the 3 pin audio connector and the receiver connector belt clip over the groove in the phone plug The clips can now be fastened to the user s belt or other clothing Attach the 3 pin audio connector to the micro phone cable and the phone plug to the monitoring unit cable MICROPHONE SPECIFICATIONS TYPE Dynamic Close Talking FREQUENCY RESPONSE At 8 mm 5 16 in 50 to 15 000 Hz see Figure 2 POLAR PATTERN Cardioid unidirectional response uniform with frequen cy symmetrical about axis See Figure 3 Impedance Microphone rating impedance is 150 ohms 200 ohms ac tual for connection to microphone inputs rated at 19 to 300 ohms Sensitivity close talked at 1 000 Hz Open Circuit Voltage
7. d replacement parts may be ordered through your Authorized Shure Pro fessional Products Dealer or from Shure Incorporated Connector Belt Clip RK200BC Windscreen cece eee eee RK 184WS Carrying Case 0c eee eee 90DJ2600 Microphone Cartridge 00 eee R93 Receiver Cartridge 2000 90EL2600 Headband Assembly 0e eee ee RK352 Receiver Tip sisi ees e K e e bee eked Pee es 90FS2600 RELATIVE RESPONSE IN dB 20 30 100 1 000 10 000 20 000 FREQUENCY IN HERTZ 500 HZ 1000 HZ TYPICAL MICROPHONE FREQUENCY RESPONSE 2 os 4000 Hz FIGURE 2 TYPICAL POLAR PATTERN FIGURE 3 203 mm 8 IN 102 mm 3 1 4 IN MIN 186 mm 7 5 16 IN MAX 15 9 mm 14 mm 5 6 IN DIA 9 16 IN PIVOT ADJUSTMENT KNOB MICROPHONE 16 9 mm mal 21 32 IN HOUSING MICROPHONE CONNECTOR ASSEMBLY MICROPHONE CARTRIDGE Za J BOOM ope RED Ae EA E BLK H Sree e WHT l RECEIVER GRN REO CARTRIDGE x 15 6 i BLK bo er RED RECEIVER PHONE PLUG ASSEMBLY_ LO Rep WHT RED 3 PIN CONNECTOR oi Lore foy SLEEVE BLK i BLK GRN OVERALL DIMENSIONS INTERNAL CONNECTIONS FIGURE 4 FIGURE 5 EARPHONE VOLUME CONTROL A simple volume control circuit can be built to enable the
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