Shure MX391W/C Microflex Condenser Boundary Microphone (White, Cardioid)


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Dale #:SHUR-MX391WC

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  • 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.

    MX391: Includes attached 4 meter (12 ft) cable terminated with a 4-pin mini connector and separate preamplifier. A rubber strain relief is provided for applications that require removing the 4-pin mini connector and connecting the mic cable directly to screw terminals in the preamplifier.


    • 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)
  • Polar PatternSupercardioid (MX391/S, MX391W/S)
    Environmental Requirements
    Operating Temperature Range-18 to 57 degrees C (0 to 135 degrees F)
    Relative Humidity0 to 95%
    Frequency Response50 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)
    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
    All settings +6 dB at 0 gain
    Signal to Noise Ratio (referenced at 94 dB SPL)Cardioid: 71.4 dB
    Equivalent Output Noise (A-weighted)Cardioid: 22.6 dB SPL
    Dynamic Range at 1 k ohm Load96.2 dB
    100 dB at 0 gain
    Common Mode Rejection45 dB minimum, 10 Hz to 100 kHz
    Preamplifier Output Clipping Level-6 dBV (0.5 V)
    12 dB at 0 gain
    PolarityPositive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of the preamplifier XLR output connector.
    Power Requirements11 to 52 Vdc phantom
    2.0 mA current consumption
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