Shure MX391/C Microflex Cardioid Condenser Boundary Microphone


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Dale #:SHUR-MX391C

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  • Microflex models from Shure, 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 C/S/O and MX391W C/S/O (white) models: have 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 applicationswhere you want to remove the 4-pin mini connector and connect the microphone cable directly to screw terminals in the preamplifier.

    MX391LP C/S/O and MX391WLP C/S/O (white) models: have an attached 4 meter (12 ft) cable terminated with a 4-pin mini connector, but do not include a preamplifier. These models are solely for use with a Shure wireless body-pack transmitter.

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

    MX393 C/S/O Models: Surface-mount microphone; includes a programmable membrane on/off switch, an on/off indicator LED, and a miniature, three pin connector.


    • 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
    • Logic input/output terminals for remote control or use with automatic mixers (MX392 models only)
    Polar PatternCardioid
    Environmental RequirementsOperating Temperature Range: -18 to 57 degrees C (0 to 135 degrees F)
    Relative Humidity: 0 to 95%
    PREAMPLIFIERThese 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 . with respect to the surface plane.
    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-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)118.8 dB, All settings +6 dB at 0 gain
    Signal to Noise Ratio (referenced at 94 dB SPL)71.4 dB
    Equivalent Output Noise (A-weighted)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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