Shure MX391/O - Omni-Directional Boundary Condenser Microphone (Black)

Model #MX391/O

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General Information

Transducer Condenser
Polar Pattern Omnidirectional
Frequency Response 50 Hz - 17 kHz
Dynamic Range (Typical) 94 dB
Signal-to-Noise Ratio 76.5 dB
Maximum Input Sound Level 111.5 dB, (@ 1 kHz, @ 1% THD)
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 Conference, Lecture and Stage Usage.
Dimensions Microphone: 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)
User Reviews
B h photo.34921152
12 November 2014

I'm using this microphone with a portable digital recorder, and the combo is great. This mic is typical of Shure products; it's rugged and sounds great. This model is the omnidirectional version - I also have a couple MX393/C which have a cardioid pattern.

B h photo.34921152
21 October 2014

We use two of these in a conference room with a video conferencing system. They are placed at two points on the conference table and pick up all conversations no matter which direction the participant is talking.

B h photo.34921152
23 January 2014

4 1/2 stars. These mics perform as you'd expect. I use two of them to record audio on typical conference room tables. Used with both Mackie 402 mixer and a Sound Devices 302. Excellent results with both. Obviously the further away someone is from this mic, the more room sound you get.

B h photo.34921152
10 May 2016

I use this for video and audio. it's always clear voice and I highly recommend

B h photo.34921152
3 June 2014

awesome piece of equipment! . great microphone.. picks up great quality audio from across the room.

B h photo.34921152
18 February 2015

best mic you can get for the money. Shure is always great

B h photo.34921152
20 April 2012

Used to record government meetings. Sound quality and pick-up depends on the room, but these are unobtrusive and work better than the gooseneck mics with a cardioid pattern we were using. One caveat - needs phantom power source (48V)

B h photo.34921152
3 February 2011

Mics are great, easy to use and easy to support

B h photo.34921152
5 January 2011

I've given this mic 4 out of 5 stars because of course you'd want a dedicated mic for anything truly important, and this omni-directional mic is not, by nature, a dedicated mic. But it works great for groups of people when there are not enough mics to go around.

B h photo.34921152
2 January 2011

I use this microphone when I am shooting more then two on screen talents. It eliminates the need to mic each person individually and from having to precisely position a boom mic. I have used this mic to record 3 and four people sitting around a table and was very happy with the quality of the sound.

Product Highlights
    In The Box
    • Shure MX391/O Microflex Omnidirectional Surface Mount Microphone (Black)
    • Zipper Bag
    • 12' In-Line Preamplifier
    • Hex Wrench
    • Limited 2-Year Warranty
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