Microflex Series Compact Boundary Microphone with On/Off Switch (Supercardioid)
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Shure Incorporated
Mac & Win
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The MX393 is a surface-mount condenser boundary microphone designed for boardrooms, alters, and conference room tables. It features a silent programmable membrane switch, interchangeable cartridge, logic input/output, LED indicators, and miniature three pin connector. Available with cardioid, supercardioid, or omnidirectional cartridges.

Programmable membrane on/off switch plus LED on/off indicator

Balanced, transformerless output for increased immunity to noise over long cable runs

Sleek, low-profile design for unobtrusive appearance

Interchangeable cardioid, supercardioid, and omnidirectional cartridges that provide optimal choice for each application

Flat frequency response across the vocal range for uncolored sound

Frequency Response

50 to 17,000 Hz


Polar Pattern



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 HarmonicDistortion, 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)



Positive sound pressure on diaphragm produces positivevoltage 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 135degrees F)

Relative Humidity: 0 to 95%

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