Shure MX391/O Microflex Omnidirectional Surface Mount Microphone (Black)

Product #4345 | SKU MX391/O | Shure
Contact us for an ETA what does this mean?
Contact us for an ETA what does this mean?
This product can't be purchased at this time, please contact us for more information.
- +

Email me when stock arrives


  • Flat frequency response
  • Interchangeable cartridges
  • Sleek, low-profile design
  • Balanced, transformerless output
  • RF filtering


The black MX391 from Shure is a small, surface-mounted electret condenser microphone. It is designed to be mounted on conference tables, stage floors, and lecterns. Its high sensitivity and wide frequency range make it especially suitable for picking up speech and vocals in sound reinforcement and recording applications.


  • Flat frequency response across the vocal range for uncoloured sound
  • Interchangeable cartridges provide a choice of polar pattern for each application
  • Sleek, low-profile design for unobtrusive appearance
  • Balanced, transformerless output for increased immunity to noise over long cable runs
  • RF filtering


Analogue Performance
Transducer Electret Condenser
Polar Pattern Omnidirectional
Frequency Range 50 Hz to 17 kHz
Signal to Noise Ratio 79.5 dB
Equivalent Noise Level 14.5 dB A-Weighted
Maximum SPL 110.7 dB SPL
THD 1%
Impedance 150 Ohms
Sensitivity 81.4 mV/Pa
Dynamic Range 96.2 dB
Output Connectors 1 x 3-Pin XLR
Cable Length 3.7 m
Operating Current Consumption 2 mA
Operating Voltage 11 to 52 V
Operating Temperature -17.78 to 57.22°C
Operating Humidity 0 to 95%
Storage Temperature -28 to 73.89°C
Length 7.94 cm

In The Box

  • Shure MX391/O Microflex Omnidirectional Surface Mount Microphone (Black)
  • Zipper Bag
  • 12' In-Line Preamplifier
  • Hex Wrench


0.0 (no ratings yet)
Own or use this product?
Give it a quick rating:
Thanks for your rating!
Share your thoughts with other customers:
Write a review


  • Product: Shure MX391/O Microflex Omnidirectional Surface Mount Microphone (Black)
  • Manufacturer: Shure
  • Model: MX391/O
  • SKU: MX391/O
  • RM Product #: 4345
  • Polar Pattern: Omnidirectional
  • Element Type: Condenser
  • Warranty: 2 year manufacturer warranty (excluding consumable e.g. lithium-ion batteries).

Recently Viewed

View All