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Ultra-high gain Omnidirectional Boundary microphone

Brand: Master Series by Sound Professionals
(10 customer reviews)


Our very best ultra-high sensitivity Omnidirectional boundary microphone

The Sound Professionals Boundary microphone is our very best microphone for Courtrooms, Depositions, Meetings and Lecture recordings and is hand-crafted in the USA. This ultra-high sensitivity microphone offers premium sound quality. This microphone will work with all Steno writers, USB soundcards and audio recorders that provide ‘plug in power’ between 2 and 12 Volts DC at the microphone input jack. Plugged into a USB microphone, it will extend the USB mic range and is perfect for picking up sidebar conferences, etc.

This microphone is also perfect for recording lectures, business meetings, interviews, etc. The microphone element is omnidirectional, so it picks up sound in all directions equally. This microphone has an ultra-high sensitivity mic element for recording sounds ranging from extremely quiet to moderately loud sounds. It has a range of approximately 125 feet (depending on conditions).

Sound Quality
The microphone has an extended frequency response and very natural and accurate sound, providing deep, solid bass, smooth midrange and clean highs.


  • Flat frequency response
  • Can be used directly with any device that provides 2-12vdc plug in power
  • Weighs only 2.5 ounces


  • Pickup Pattern: Omnidirectional
  • Frequency Range: 20 Hz – 20,000 Hz +/-1dB
  • Sensitivity: -24dB ±3dB @ 94dB SPL
  • S/N Ratio (1kHz, 94 dB input, A-weighted): 80dB
  • Self Noise: 14 dBA
  • Maximum SPL at 12vdc: 120dB
  • Dynamic Range: 106dB, 1 kHz at Max SPL
  • Impedance: 2.2 kOhms
  • Voltage range – 2vdc – 12vdc (48v on XLR version)
  • Current draw: 500 µA
Weight 0.8 lbs

10 reviews for Ultra-high gain Omnidirectional Boundary microphone

  1. kimberly a stephenson

    I use this mic in court with my laptop. It is with every penny. The quality of the sound and ability to pick up low-level boxes in court is outstanding.

  2. Chris Duffield

    This is a great little mic. Because of the headphone jack, it can be used with your laptop or your writer (for court reporters). It can be plugged into the USB mics to get a blended sound. You can get various cord lengths, which gives you many options. My only quip is very small, that it likes to flip over if it’s not secured to something. I use double-sided tape to hold it to my judge’s bench to use during sidebars.

  3. Stephanie A

    Love Sound Professionals and their support. Really the best of the best!!

  4. Lorraine K

    I am a court reporter and need to use this for sidebar conferences. It is a wonderful option! Plug it into your writer or USB microphone and you can pick up even the quietest sounds at the bench.

  5. Donna F

    I like the fact there isn’t an on/off switch and no need to worry about batteries

  6. Charlotte R | 9 Aug 2023

    Have one of these already, though square (previous model), this new model is round, excellent product.

  7. kroert225 (verified owner)

    I LOVE this boundary mic because it lays flat and doesn’t easily get knocked over like my previous mic.

  8. Jennifer Vaillancourt (verified owner)

    This is the best microphone I’ve purchased. Audio comes in crystal clear and picks up the entire room. I would very much recommend.

  9. cjwalsh (verified owner)

    This is a very sensitive mic. Great for meetings in a large room with many people. Very clear.

  10. Linda B  Florida

    “Microphone works excellent!”

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