28% Off

Shure MX391 Microflex Boundary Microphone White Omnidirectional

SKU: SHMX391WAO MFR: MX391W-A/O
Earn VIP Reward Points

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.
See More Product Details
Ships from Manufacturer?
Free Shipping

See Options

1

Protect your gear with Adorama Protect.* Learn more

1 Year

$29.99

2 Year

$49.99

3 Year

$59.99

Available to U.S. customers only.

Need help? Ask our experts.

Overview
Compare
Specs
Q&A

Questions & Answers

Reviews about this item

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.

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