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.
Close-talk microphone operation and unidirectional polar pattern for effective noise reduction
Smooth, natural microphone voice frequency response
Microphone can be worn on right or left side, boom pivots through 155 degrees
Microphone boom length adjusts through 89 mm (3 1/2" in) range
High sensitivity enclosed ear receivers block out room noise, enhance clarity of reception
Self-adjusting, free-swiveling cushioned earpieces promote user comfort and lower fatigue during extended periods of use
Cardioid dynamic
MICROPHONE
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
