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Shure MX391/C - Cardioid Boundary Condenser Microphone (Black)

B&H # SHMX391C MFR # MX391/C
In Stock
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You Pay: $185.00

There's never been smarter boundary microphones than the Microflex models from Shure. With many models to choose from, 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 one of the new interchangeable condenser cartridges. Available in cardioid, supercardioid and omnidirectional polar patterns, the Microflex cartridges give you superior Shure quality sound options for every installation. 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 new Microflex Boundary microphones "the smart choice" for just about every application. Take a listen today.

The MX391C is a miniature black condenser boundary microphone with an in-line preamp, a 12 foot (4 meter) attached cable that terminates to a 4-pin mini 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
Cardioid pickup pattern for general sound reinforcement applications. Pickup angle (-3 dB) = 130°
Transducer Condenser
Polar Pattern Cardioid
Frequency Response 50 Hz to 17 kHz
Dynamic Range (Typical) 96.2 dB
Signal-to-Noise Ratio 71.4 dB
Maximum Input Sound Level 118.8 dB, (1 kHz at 1% Total Harmonic Distortion, 1 kW Load)
Power Requirements 11 to 52v DC, Phantom
Output Impedance 150 Ohms (180 Ohms Actual)
Output Connectors 4-Pin Mini Connector, (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.)
Preamplifier Ultimately Terminates to XLR-3M Connector.
Pad None
Low Frequency Roll-Off None
Applications General Sound Reinforcement Applications
Dimensions 3.126 x 2.088 x .750" (7.940 x 5.304 x 1.905cm) LxWxH
Weight Microphone: 4.16 oz. (117.9 g)
RK183PK Pre-Amplifier: 3.21 oz. (91 g)
Shure MX391/C - Cardioid Boundary Condenser Microphone (Black)
  • (RK183PK) Preamplifier (4-Pin Mini to XLR-3M)
  • 2 Year Warranty

    by PowerReviews
    ShureMX391/C - Cardioid Condenser Mic (Black)

    (based on 1 review)

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    Reviewed by 1 customer

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    Excellent boundary mic

    By kconnor9000

    from Seattle, WA

    About Me Experienced

    Verified Buyer


    • Elegant
    • Great Pickup
    • Long Cable
    • Well-made


    • Long Cable - Tangles

    Best Uses

      Comments about Shure MX391/C - Cardioid Condenser Mic (Black):

      This is astoundingly good boundary mic for ~$. Much more solid, heavy, and elegant (both the mic and the inline preamp unit) than I expected. Pattern and noise are just as advertised. For most conference room applications, the room noise (computers, AC, etc.) is going to be much louder than the self-noise of these mics. I will probably pick up more. This version does NOT have a mute button, BTW. B&H delivery and pricing were top notch, per usual!

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