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Shure MX391 Microflex Omnidirectional Boundary Microphone (Black)

BH #SHMX391O • MFR #MX391/O
Shure MX391 Microflex Omnidirectional Boundary Microphone (Black)
Key Features
  • Omnidirectional Pickup Pattern
  • No Mute Switch
  • Interchangeable Mic Capsule
  • Preamp with XLR Output
Styled in black, this Shure MX391 is a Microflex omnidirectional boundary microphone. It's easy to use, features an inline preamp, and offers interchangeable mic capsules. It's designed to pick up speech in a manner preserving its intelligibility. The mic is well suited for sound reinforcement and recording applications in boardrooms, conference centers, educational settings, houses of worship, and more.
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$229.00
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Shure MX391 Overview

  • 1Description
  • 2A Streamlined, Low-Profile Solution
  • 3Interchangeable Mic Capsule Tailored for Speech and Vocals
  • 4Inline Preamp with XLR Output

Styled in black, this Shure MX391 is a Microflex omnidirectional boundary microphone. It's easy to use, features an inline preamp, and offers interchangeable mic capsules. It's designed to pick up speech in a manner preserving its intelligibility. The mic is well suited for sound reinforcement and recording applications in boardrooms, conference centers, educational settings, houses of worship, and more.

A Streamlined, Low-Profile Solution
  • The compact, low-profile microphone is designed to be surface-mounted on conference tables, stage floors, and lecterns.
  • The sleek, unobtrusive form factor stays out of the way of panelists and presenters, making it a smart solution for video conferencing.
  • The MX391 doesn't offer mute switches, so speakers can't mute themselves—the mic is always ready to capture every moment in a panel discussion or presentation.
Interchangeable Mic Capsule Tailored for Speech and Vocals
  • The condenser microphone is optimized for crisp, clear speech.
  • The mic's omnidirectional pickup pattern captures sound from all around the mic, allowing more than one person to use a single microphone.
  • An interchangeable mic capsule design allows you to swap out the omnidirectional capsule for a cardioid capsule (if you need a narrower pickup pattern) or a supercardioid capsule (for a very narrow pickup pattern).
Inline Preamp with XLR Output
  • Included is an inline preamp with a standard 3-pin XLR output ready to plug into a PA system, mixer, or recorder capable of supplying 12 to 48V phantom power needed to power the mic.
  • The preamp offers a high level of RF filtering, making the mic substantially less susceptible to unwanted radio interference.
UPC: 042406051514

Shure MX391 Specs

Key Specs
Form Factor
Boundary/Surface Mount
Element Type
Electret Condenser
Polar Pattern
Omnidirectional
Frequency Range
50 Hz to 17 kHz
Maximum SPL
111 dB SPL
Power Sources
Phantom Power
Microphone
Form Factor
Boundary/Surface Mount
Intended Sound Sources
Vocals, Speech/Voice-Over
Sound Field
Mono
Element Type
Electret Condenser
Polar Pattern
Omnidirectional
Circuitry
Solid-State
Windscreen
No
Performance
Frequency Range
50 Hz to 17 kHz
Maximum SPL
111 dB SPL
Sensitivity
-22 dBV/Pa
Dynamic Range
96.2 dB
Signal-to-Noise Ratio
80 dB
CMRR
45 dB
Power
Power Sources
Phantom Power
Operating Voltage
11 to 52 V (Phantom Power)
Operating Current Consumption
2 mA
Physical
Color
Black
Mounting Thread Size
No Mount Included
Included Case
No
Included Filters
No
Operating Temperature
0 to 135°F / -18 to 57°C
Operating Humidity
0 to 95%
Storage Temperature
-20 to 165°F / -28 to 73°C
Certifications
CE
Packaging Info
Package Weight
1.05 lb
Box Dimensions (LxWxH)
10 x 4.7 x 3.15"

Shure MX391 Reviews

See any errors on this page? Let us know

question

does the mic hear vibrations on a floor such as dancers or people walking on a stage ?
Asked by: Charles
The Shure MX391 will pick up vibration from the surface it is placed on.
Answered by: Jeff P.
Date published: 2018-08-27

question

I'm trying to understand what it means to provide phantom power is for the shure 391o microphone?
Asked by: Anonymous
normally 48 v
Answered by: DIAMARELIS R.
Date published: 2018-08-27

Will 6 of these work in a meeting hall (25 people ...

Will 6 of these work in a meeting hall (25 people U table) without feedback?
Asked by: Diego
Feedback is typically caused by sound from speakers bleeding back into a microphone, which creates a feedback loop. The Shure MX391 is an omnidirectional boundary microphone, so it will be particularly susceptible to feedback as there is no axis of rejection. Caution should be used if the microphone is connected to speakers in the same area, and the speakers should be faced away from the microphone to avoid feedback.
Answered by: calvinm
Date published: 2023-06-01

Would one mic cover a 6 to 8 foot wide area with ...

Would one mic cover a 6 to 8 foot wide area with 2 to 6 people sitting at a witness table? Will be mixed with 9 other board member goose neck mics, the distance between the dias and the witness table is typically ten to 15 feet giver or take.
Asked by: greg
The abilities of the Shure MX391 Microflex Cardioid Boundary Microphone will likely be stretched when tasked with picking up voice from 6 to 8 feet, especially if some in this scenario are quiet speakers. For the best results in this specific situation, two MX391 would be ideal.
Answered by: Matt Z
Date published: 2022-07-23

question

Does it come supplied with the cardioid cartridge?
Asked by: Kevin P.
Yes - this microphone does include the Cardioid transducer.
Answered by: Mark S.
Date published: 2018-08-27

question

Any suggestions on the ideal phantom power source to use this mic with my Panasonic AG-HMC40P camera? Thank you.
Asked by: Sarah W.
I don't use phantom power with this mic. I plug it directly into a Zoom recorder and it picks up everything I need it to.
Answered by: Matt P.
Date published: 2018-08-27

question

does this have a mute switch?
Asked by: Moses
It does not. It is intended to be controlled externally.
Answered by: Product Rep Shure Expert
Date published: 2018-08-27
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