Shure MX391 Microflex Boundary Microphone White Cardioid
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Shure MX391 Microflex Boundary Microphone White Cardioid

SKU: SHMX391WAC MFR: MX391W-A/C
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Key Features

  • Capture crystal-clear audio with the Shure MX391 boundary microphone, perfect for meetings.
  • Achieve professional sound quality with this condenser microphone's wide 50 Hz - 17 kHz range.
  • Selectable polar patterns (cardioid, supercardioid, omni) tailor the mic to any application.
  • Ensure clear recordings with low noise; excellent 71.4 dB signal-to-noise ratio (cardioid).
  • Durable Shure microphone designed to withstand operating temperatures from -0.4 to 134.6 °F.
  • Discreet, low-profile design integrates seamlessly into any conference room or recording space.
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Questions & Answers

FAQ

What makes the MX391 Microflex Boundary Microphone suitable for a wide range of applications?

The MX391 Microflex Boundary Microphone is engineered with an interchangeable condenser cartridge and a low-profile design, making it versatile for various environments like altars, boardrooms, and distance learning centers.

What are the special features of the MX391 Microflex Boundary Microphone?

The MX391 Microflex Boundary Microphone is equipped with programmable, silent membrane switches, logic inputs, and outputs. It also offers a selection of interchangeable condenser cartridges for customized audio.

What is included with the MX391 Microflex Boundary Microphone?

The MX391 model comes with an attached 4-meter (12 ft) cable, terminated with a 4-pin mini connector and a separate preamplifier. A rubber strain relief is also provided for applications that require direct mic cable connection to the preamplifier.

What is the purpose of the interchangeable condenser cartridges in the MX391 Microflex Boundary Microphone?

The interchangeable condenser cartridges in the MX391 Microflex Boundary Microphone allow for customization and adaptability, ensuring that your audio needs are always met with precision and clarity.

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Review Summary

Shure MX391 Specifications

  • Color

    White

  • Type

    Condenser (electret bias)

  • Frequency Response

    50 Hz - 17 kHz

  • Polar Pattern

    MX391/C: Cardioid
    MX391/S: Supercardioid
    MX391/O: Omnidirectional

  • Output Impedance

    EIA rated at 150 Ohm (180 Ohm actual)

  • Environmental Conditions

    Operating temperature range: -0.4 Degree F - 134.6 Degree F (-18 Degree C - 57 Degree C)
    Relative Humidity: 0 - 95%

  • Power Requirements

    11 - 52 Vdc phantom, 2.0 mA

  • Sensitivity

    At 1 kHz, open circuit voltage; 1 Pascal = 94 dB SPL; All settings -12 dB at 0 gain (internal modification):
    Cardioid -29.5 dB (33.5 mV)
    Supercardioid -28.3 dB (38.5 mV
    Omnidirectional -21.8 dB (81.4 mV)

  • Maximum SPL

    1 kHz at 1% THD, 1 kOhm load; All settings +6 dB at 0 gain (internal modification):
    Cardioid: 118.8 dB
    Supercardioid: 117.5 dB
    Omnidirectional: 110.7 dB

  • Equivalent Output Noise A-weighted

    Cardioid: 22.6 dB SPL
    Supercardioid: 21.3 dB SPL
    Omnidirectional: 14.5 dB SPL

  • Signal-to-Noise Ratio

    Referenced at 94 dB SPL at 1 kHz:
    Cardioid: 71.4 dB
    Supercardioid: 72.7 dB
    Omnidirectional: 79.5 dB

  • Dynamic Range 1kOhm load @ 1kHz

    96.2 dB

  • Common Mode Rejection

    45 dB minimum, 10 Hz to 100 kHz

  • Preamplifier Output Clipping Level

    1% THD: -6 dBV (0.5 V)

  • Polarity

    Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of the preamplifier XLR output

  • UPC Code

    042406576864

About Shure MX391

Boundary microphone provides high-quality sound for a wide range of applications due to its interchangeable condenser cartridge and low-profile design.

Equipped with features like programmable, silent membrane switches, logic inputs and outputs, 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.

Shure MX391 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

Warranty Information

This product has a limited warranty of 24 months.

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Product Documents

User Manual

Key Features

  • Capture crystal-clear audio with the Shure MX391 boundary microphone, perfect for meetings.
  • Achieve professional sound quality with this condenser microphone's wide 50 Hz - 17 kHz range.
  • Selectable polar patterns (cardioid, supercardioid, omni) tailor the mic to any application.
  • Ensure clear recordings with low noise; excellent 71.4 dB signal-to-noise ratio (cardioid).
  • Durable Shure microphone designed to withstand operating temperatures from -0.4 to 134.6 °F.
  • Discreet, low-profile design integrates seamlessly into any conference room or recording space.

What's in the box:

  • Shure MX391 Microflex Boundary Microphone
  • Zipper Bag
  • In-Line Preamplifier
  • Hex Wrench
  • Shure 2 Year Limited Warranty