Shure Incorporated Microflex Series Compact Boundary Microphone with On/Off Switch (Omnidirectional) MX393/O

The MX393 Microflex® Wired Boundary Microphone from Shure is equipped with a programmable, silent membrane switch and green LED indicator. It is a high-quality solution for a range of applications such as altars, boardrooms and distance learning centers. Includes miniature three pin connector and 12' XLR cable.
All measurements taken with microphone mounted on a wooden surface 76.2 cm x 76.2 cm (30 in. x 30 in.).
Frequency Response
50 to 17,000 Hz
Polar Pattern
Omnidirectional
Output Impedance
EIA Rated at 150 ohms (180 ohms actual)
Sensitivity (at 1 kHz, open circuit voltage)
Omnidirectional: -22.0 dBV/Pa (79.4 mV)
1 Pascal=94 dB SPL
Maximum Sound Pressure Level (1 kHz at 1% Total Harmonic Distortion, 1 k ohm load)
Omnidirectional: 111.5 dB
Signal to Noise Ratio (referenced at 94 dB SPL)
Omnidirectional: 76.5 dB
Equivalent Output Noise (A-weighted)
Omnidirectional: 17.5 dB SPL
Dynamic Range
94.0 dB
Common Mode Rejection
45 dB minimum, 10 Hz to 100 kHz
Switch Attenuation
50 dB minimum
Preamplifier Output Clipping Level
-6 dBV (0.5 V)
Polarity
Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output connector.
Power Requirements
11 to 52 Vdc phantom
2.0 mA current consumption
Environmental Requirements
Operating Temperature Range: -18 to 57 degrees C (0 to 135 degrees F)
Relative Humidity: 0 to 95%