SHURE
 MX391, MX392, and MX393 Microflex Boundary Installed Microphones

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MX391, MX392, and MX393 Microflex Boundary Microphones


Product Code: MX391, MX392,MX393

 MX391, MX392 and MX393 Microflex® Wired Boundary Microphones from Shure are the smartest boundary microphones yet. Equipped with features like programmable, silent membrane switches, logic inputs and outputs, and LED indicators, Microflex Boundary microphones are the high-quality solution for a range of applications, such as altars, boardrooms and distance learning centers. Every Microflex Boundary microphone features a choice of interchangeable condenser cartridges.

Available in cardioid, supercardioid and omnidirectional polar patterns, the Microflex cartridges give you superior Shure quality sound for every application. In addition, their programmable switches offer the flexibility to be set for Push to Talk, Push to Mute or Push On/Push Off modes. Attractively designed with a low profile, professional appearance, the Microflex Boundary microphones come with an easy to use paint mask for your custom-color installations. Find out why we call the Microflex Boundary microphones "the smart choice" for just about every application. Take a listen today.

The polar pattern of the cartridge is indicated by the model number suffix:
C = Cardioid, S = Supercardioid, O= Omnidirectional

MX391: Includes an attached 4 meter (12 ft) cable terminated with a 4-pin mini connector and a separate preamplifier. A rubber strain relief is provided for applications where you want to remove the 4-pin mini connector and connect the microphone cable directly to screw terminals in the preamplifier.
  • MX391/C -- Cardioid, Black
  • MX391/S -- Supercardioid, Black
  • MX391/O -- Omnidirectional, Black
  • MX391W/C -- Cardioid, White
  • MX391W/S -- Supercardioid, White
  • MX391W/O -- Omnidirectional, White

MX392: Surface-mount microphone; includes a programmable membrane on/off switch, LED logic input/switch logic output terminals, an on/off indicator LED, screw terminal connections, and attached unterminated cable

  • MX392/C -- Cardioid, Black
  • MX392/S -- Supercardioid, Black
  • MX392/O -- Omnidirectional, Black

MX393: Surface-mount microphone; includes a programmable membrane on/off switch, an on/off indicator LED, and a miniature, three pin connector.  Includes 12 foot XLR cable.  

  • MX393/C -- Cardioid, Black
  • MX393/S -- Supercardioid, Black
  • MX393/O -- Omnidirectional, Black

The MX391BP microphones have been discontinued.
Features
  • Flat frequency response across the vocal range for uncolored sound
  • Interchangeable cardioid, supercardioid, and omnidirectional cartridges that provide optimal choice for each application
  • Sleek, low-profile design for unobtrusive appearance
  • Balanced, transformerless output for increased immunity to noise over long cable runs
  • Programmable on/off switch and LED on/off indicator (MX392/MX393 models only)
  • LED logic input and switch logic output terminals for remote control or use with automatic mixers (MX392 models only)
Specifications
MX391
  • Polar Pattern
    Cardioid (MX391/C, MX391W/C)
    Supercardioid (MX391/S, MX391W/S)
    Omnidirectional (MX391/O, MX391W/O)
  • Environmental Requirements
    Operating Temperature Range: -18 to 57 degrees C (0 to 135 degrees F)
    Relative Humidity: 0 to 95%
  • Dimensions : See User Guide
  • PREAMPLIFIER SPECIFICATIONS MX391 ONLY
    These specifications apply only to the MX391/MX391W microphones when used with the supplied preamplifier. All measurements taken with the microphone mounted on a 76.2 cm x 76.2 cm (30 in. x 30 in.) wooden surface and with the sound source incident at 30 degrees with respect to the surface plane.
  • Frequency Response : 50 to 17,000 Hz
  • Output Impedance (at 1000 Hz) : 180 ohms actual (rated at 150 ohms)
  • Open Circuit Sensitivity 1 kHz ref. 1 V per Pascal *
    Cardioid: -29.6 dB (33.5 mV)
    Supercardioid: -28.3 dB (38.5 mV)
    Omnidirectional: -21.5 dB (81.4 mV)
    All settings -12 dB at 0 gain; *1 Pascal = 94 dB SPL
  • Maximum Sound Pressure Level (1 kHz at 1% Total Harmonic Distortion, 1 k ohm load)
    Cardioid: 118.8 dB
    Supercardioid: 117.5 dB
    Omnidirectional: 110.7 dB
    All settings +6 dB at 0 gain
  • Signal to Noise Ratio (referenced at 94 dB SPL)
    Cardioid: 71.4 dB
    Supercardioid: 72.7 dB
    Omnidirectional: 79.5 dB
  • Equivalent Output Noise (A-weighted)
    Cardioid: 22.6 dB SPL
    Supercardioid: 21.3 dB SPL
    Omnidirectional: 14.5 dB SPL
  • Dynamic Range at 1 k ohm Load
    96.2 dB
    100 dB at 0 gain
  • Common Mode Rejection : 45 dB minimum, 10 Hz to 100 kHz
  • Preamplifier Output Clipping Level
    -6 dBV (0.5 V)
    12 dB at 0 gain
  • Polarity : Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of the preamplifier XLR output connector.
  • Power Requirements
    11 to 52 Vdc phantom
    2.0 mA current consumption

MX392 & MX 393

  • Frequency Response : 50 to 17,000 Hz
  • Polar Pattern
    Cardioid (MX392/C, MX393/C)
    Supercardioid (MX392/S, MX393/S)
    Omnidirectional (MX392/O, MX393/O)
  • Output Impedance
    EIA Rated at 150 ohms (180 ohms actual)
    Sensitivity (at 1 kHz, open circuit voltage)
    Cardioid Cartridge: -27.5 dBV/Pa (42.2 mV)
    Supercardioid Cartridge: -26.5 dBV/Pa (47.3 mV)
    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)
    Cardioid: 117.0 dB
    Supercardioid: 116.0 dB
    Omnidirectional: 111.5 dB
  • Signal to Noise Ratio (referenced at 94 dB SPL)
    Cardioid: 71.0 dB
    Supercardioid: 72.0 dB
    Omnidirectional: 76.5 dB
  • Equivalent Output Noise (A-weighted)
    Cardioid: 23.0 dB SPL
    Supercardioid: 22.0 dB SPL
    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.
  • Logic Connections (MX392 Only)
    LED IN: Active low (<1.0v), TTL compatible. Absolute maximum voltage: -0.7V to 50V.
    SWITCH OUT: Active low (<0.5V), sinks up to 20mA, TTL compatible. Absolute maximum voltage: -0.7V to 24V (up to 50V through 3 k ohms).
  • 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%
  • Dimensions : See User Guide

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