Shure Incorporated SM Series Headworn Microphone with Dual Enclosed Ear Receivers SM2

The SM2 microphone is a close-talking unidirectional dynamic with a response from 50 to 15,000 Hz. Because of its noise reducing character, it discriminates in favor of close sounds and against distant sounds. As a result, it can be used even under extremely noisy conditions without loss or masking of the voice signal. The microphone boom pivots through 155 degrees so that the microphone can be correctly positioned at the corner of the mouth either from the left or right side. A locking thumbscrew prevents the microphone from slipping or twisting out of place.
Type
Dynamic, Close-Talking
Frequency Response (at 8mm [5/16 in.])
50 to 15,000 Hz
Polar Pattern
Cardioid (unidirectional) response-uniform with frequency, symmetrical about axis
Impedance
Microphone rating impedance is 150 ohms (200 ohms actual) for connection to microphone inputs rated at 19 to 300 ohms
Microphone Sensitivity (close-talked at 1,000 Hz)
Open Circuit Voltage: -47.0 dBV/Pa*(4.5 mV)
*1Pa = 94 dB SPL
Hum Sensitivity (typical)
38.4 dB equivalent SPL in 1 m0e field
Polarity
Positive pressure on diaphragm produces positive voltage on RED cable lead with respect to BLACK cable lead
RECEIVERS
Type
Dynamic
Frequency Response
100 to 8,000 Hz
Output Level (at each ear)
104.0 dB SPL with 1.4V at 1 kHz (1.0 mW into 6 cc cavity)
Polarity
Positive voltage on WHITE and/or YELLOW cable leads produces positive pressure at receiver