Shure SM12A User Manual page 2

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
microphone as close as possible to the corner of the
mouth. For optimum close-talking operation, the
microphone 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
explosive 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
microphone 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 frequency, sym-
metrical about axis (see Figure 3)
Impedance
Microphone rating impedance is 150 ohms (200 ohms actual)
for connection to microphone inputs rated at 19 to 300 ohms
Sensitivity (close-talked at 1,000 Hz)
Open Circuit Voltage. . . . . . . . . . . . . . –67.0 dBV/Pa (.45 mV)
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
Impedance
Output Level
Phasing
Connector
GENERAL SPECIFICATIONS
Cable
Case
Dimensions
Net Weight
Packaged Weight
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC
Directive
performance criteria in European Standard EN55103 (1996)
parts 1 and 2, for residential (E1) and light industrial (E2)
environments.
ACCESSORIES AND REPLACEMENT PARTS
The following furnished accessories and replacement parts
(1 Pa = 94 dB SPL)
may
Professional Products Dealer or from Shure Incorporated.
Connector Belt Clip .......................................................RK200BC
Windscreen ................................................................RK 184WS
Carrying Case .............................................................. 90DJ2600
Microphone Cartridge............................................................. R93
Receiver Cartridge ....................................................... 90EL2600
Headband Assembly ..........................................................RK352
Receiver Tip ................................................................. 90FS2600
2
70 to 12,000 Hz
2,000 ohms at 1 kHz (200-ohms cartridge with matching trans-
former in phone plug)
105 dB SPL with 1.4V at 1 kHz (1.0 mW into 2 cc cavity)
Positive voltage on phone plug tip produces positive pressure in
ear tube
Phone plug (contains matching 200:2,000 ohm transformer)
Non-detachable, 1.5m (5 ft), four conductor, shielded, plas-
tic-jacketed; additional 762 mm (2.5 ft), two-conductor receiver
cable attached to microphone connector.
Black thermoplastic microphone and pivot housing, anodized
aluminum end caps, stainless steel grille, ear tube and boom
See Figure 4
84 grams (3 ounces) less cable and connectors
978 grams (2 lb, 2 1/2 oz)
89/336/EEC.
be ordered through
Meets applicable tests
your Authorized
and
Shure