Pricing and availability

We compare 600+ stores and found this item at 5 stores. Prices updated .

Average Price: $211

Standard/Professional

$100

$401+

Price Tier

Budget

Standard

High-end

Price History

Based on price data from 3 merchants for "Shure MX391/C Microflex Cardioid Boundary Microphone". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

* Product prices and availability are updated by Equipboard every 24hrs and are subject to change. Equipboard may receive compensation for purchases made at participating retailers linked on this site. This compensation does not affect what products or prices are displayed, or the order of prices listed. For more information, please refer to our affiliate disclosure.

Description

The Shure MX391/C Microflex Cardioid Boundary Microphone is your go-to solution for capturing pristine audio in a variety of professional settings. Whether you're in a boardroom, a classroom, or a house of worship, this microphone ensures every word is heard with clarity. Thanks to its interchangeable condenser cartridges, you can tailor its performance to match your specific needs, be it cardioid, supercardioid, or omnidirectional patterns.

Designed with a balanced, transformerless output, the MX391/C minimizes unwanted noise and interference, delivering uncolored and high-quality sound. Its low-profile form allows it to blend seamlessly into any environment, making it ideal for surface mounting on tables, floors, or lecterns without obstructing the view. Plus, it comes with a 12-foot cable with a 4-pin mini connector and a separate preamplifier for easy integration into your existing setup.

This microphone is not just about performance; it's about versatility. From musical theater and opera stages to conference calls and educational lectures, the Shure MX391/C adapts to any acoustic challenge with ease. Its high sensitivity and wide frequency range make it perfect for picking up speech and vocals, ensuring your audience captures every nuance of your presentation.

Key Features:

  • Wired boundary microphone with cardioid condenser cartridge
  • Interchangeable condenser cartridges: cardioid, supercardioid, and omnidirectional
  • Balanced, transformerless output minimizes noise and interference
  • Includes a 12-foot cable with 4-pin mini connector and separate preamplifier
  • Low-profile design suitable for conference tables, stage floors, and lecterns
  • High sensitivity and wide frequency range for capturing speech and vocals

Product specs

Microphone Type Condenser
Polar Pattern Cardioid
Frequency Response 50Hz-17kHz
Max SPL 118.8dB SPL
Output Impedance 150 ohms
Signal to Noise Ratio 71.4dB
Self Noise 22.6dB A weighted
Cable Length 12.13 ft.
Connector TA3
Included Accessories Zipper Bag, In-line Preamp

FAQs

What is the primary application of the Shure MX391/C Microflex Cardioid Boundary Microphone?

The Shure MX391/C is designed for capturing speech in environments like conference rooms, theaters, and studios, offering clear and natural sound reproduction.

Does the Shure MX391/C require phantom power?

Yes, the Shure MX391/C requires phantom power between 11V and 52V to operate.

What polar pattern does the Shure MX391/C feature?

The Shure MX391/C features a cardioid polar pattern, which effectively reduces background noise and focuses on sound sources directly in front of the microphone.

Is the Shure MX391/C suitable for recording music ensembles?

While primarily designed for speech, the Shure MX391/C can also be used to capture small musical ensembles, providing a natural sound with minimal phase interference.

What type of connector does the Shure MX391/C use?

The Shure MX391/C uses a TA3 connector and includes an in-line preamp for easy integration into audio systems.

Reviews

PROS

  • Solid, well-built microphone with a durable design

  • Highly sensitive, captures voices clearly from several feet away

  • Excellent sound quality, perfect for group discussions and conference rooms

  • Compact and unobtrusive, easy to mount on various surfaces

  • Works well with mixers, providing great audio results

  • Offers good value for the price, with reliable performance

  • Captures audio effectively across large spaces or rooms

  • Elegant design with a heavy, quality feel

  • Inline pre-amp enhances audio quality and performance

CONS

  • Can transmit surface noise, such as hands or books on a desk

  • Difficult to minimize feedback in some settings

  • Lacks a mute button for quick sound control

Based on 0 Reviews and 0 Ratings

5 star
4 star
3 star
2 star
1 star

More Shure Condenser Microphones

Accessories & Related Items

Artist usage

Community setups

Similar

Gear Guides