Shure SM12 User Guide

W A R N I N G

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 comfortable listening level and position the receiver tip at the entrance of the ear.

4.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.

5.Snap the microphone connector belt clip over the groove in the 3-pin male 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 beltor other clothing. Attach the 3-pin audio connector to the microphone cable and the phone plug to the monitoring unit cable.

6.NOTE: 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 located just inside the ear tube tip.

SPECIFICATIONS

MICROPHONE

Type

Dynamic, Close-Talking

Frequency Response (at 8 mm 15/16 in.]) 50 to 15,000 Hz (see Figure 2)

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FREOITIICV IN HERTZ

TYPICAL MICROPHONE FREQUENCY RESPONSE

FIGURE 2

Polar Pattern

Cardioid (unidirectional) response-uniform with frequency, symmetrical about axis (see Figure 3)

LEGEND

. ...... 4000 Hz

POLAR PATTERN

lmpedance

Microphone rating impedance is 150 ohms (200 ohms actual) for connection to microphone inputs rated at 19 to 300 ohms

Output Level (close-talked at 1,000 Hz)
Open Circuit Voltage . . . . . . . .	-47.0	dB	(4.5 mV)
(0 dB = 1 volt per 100 microbars)
Power Level . . . . . . . . . . . . . . .	-66.0	dB
(0 dB = 1 milliwatt per 10 microbars)

Hum Sensitivity (typical)

38.4 dB equivalent SPL l n a 1 millioersted field

Phasing

Positive pressure on diaphragm produces positive voltage on pin 2 of microphone connector

Connector

Professional three-pin male audio connector designed to mate with Cannon XL series, Switchcraft A3 (Q.G.)series or equivalent connectors.

RECEIVER

Type

Dynamic

Frequency Response

70 to 12,000 Hz

lmpedance

2,000 ohms at 1 kHz (200-ohm cartridge with matching transformer in phone plug)

Output Level

105 dB SPL with 1.414V at 1 kHz (1.0 mW into 2 cc cavity)

Phasing

Positive voltage on phone plug tip produces positive pressure in ear tube

Connector

Phone Plug (contains matching 200:2,000 ohm transformer)

GENERAL

Cable

Non-detachable, 1.5m (5 ft), four-conductor, shielded, plastic-jacketed; additional 762 mm (2.5 ft), two-con- ductor receiver cable attached to microphone connector

Case

Black thermoplastic microphone and pivot housing, anodized 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

FIGURE 3

797 grams (1 Ib, 12 oz)