Shure Beta 91A Condenser Boundary Microphone

Condenser Boundary Microphone with Contour Switch for Miking Kick Drums and Low-frequency Instruments
Shure Beta 91A Condenser Boundary Microphone image 1
Shure Beta 91A Condenser Boundary Microphone image 1
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Shure Beta 91A Condenser Boundary Microphone
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Low-profile Kick Drum Miking Solution!

Shure's outstanding Beta 91A half-cardioid condenser boundary microphone lets you capture a kick drum's true punch, without taking up a lot of real estate onstage. In fact, the Beta 91A excels at picking up all kinds of low-frequency-intensive instruments; its response is tailored for bass frequencies. The Beta 91A's integrated preamp makes it a very convenient condenser, and its ability to handle high SPLs means worry-free use in any environment (even with the loudest live drummers). A 2-position contour switch lets you choose between a flat response or a low-mid-scooped punchy response. You'll love what the Beta 91 does for your live sound!

Shure Beta 91A Condenser Boundary Microphone Features:
  • Type: Electret Condenser
  • Frequency Response: 20Hz-20kHz
  • Polar Pattern: Half-cardioid (cardioid in hemisphere above mounting surface)
  • Impedance: 146 Ohms
  • Sensitivity (at 1kHz, open circuit voltage): -48.5 dBV/Pa (3.8mV)
  • Maximum SPL ( kHz at 1% THD): 1,000 ohm load: 151dB; 2500 Ohm load: 155dB
  • Signal-to-Noise Ratio (referenced at 94 dB SPL at 1kHz): 64 dB
  • Dynamic Range (at 1kHz): 1,000 Ohm load: 121.5dB; 2500 Ohm load: 125.5dB
  • Common Mode Rejection (20Hz-20kHz): >55dB
  • Clipping Level (20Hz-20 kHz at 1% THD) 1,000 ohm load: 7.50dBV, 2,500 ohm load: 12.5dBV
  • Self Noise (typical, equivalent SPL, A-weighted): 29.5dB SPL-A
  • Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
  • Weight: 16.6 oz.
  • Frequency Contour Switch: 7dB of attenuation centered at 400Hz
  • Connector: 3-pin XLR, balanced
  • Power Requirements: 11-52 Vdc phantom power, 5.6 mA
  • Zipper pouch included
Shure's Beta 91A condenser boundary mic captures your kick drum's punch perfectly, with low-profile convenience!

Additional Media

Studio Microphone Buying Guide

Tech Specs

Microphone Type Boundary
Polar Pattern Half-Cardioid
Frequency Response 20Hz-20kHz
Max SPL 155dB
Output Impedance 146 ohms
Signal to Noise Ratio 64.5dB
Self Noise 29.5dB (A weighted)
Color Black
Connector XLR
Weight 1 lb.
Included Accessories Zippered Carrying Bag
Manufacturer Part Number BETA 91A

Customer Reviews

Based on 22 reviews
Write your review

Beta 91A

Man I really like this mic!!! Beta 91 inside and Yamaha SubKick outside just works.
Music background: Theatre Sound Designer/Studio Owner

91A Kicks!

I love using this mic inside a kick drum. Attack and punch when you needed it by itself or combine with other mics for a paired kick sound.
Music background: Live Sound / Recording Engineer, Tech Director

Let´s have kick!

This mic really surprised me! I put it inside the kick drum and it´s amazing how well it captured the kick! I like bass drums with more lows and that´s why I use another mic outside the drum. I combine them, so I have the low end of one mic and the kick and defiinion of the Beta 91 A, excelent! I use it flat, but it also has a low-cut switch. The internal pre-amp is great! Regular XLR cable are much easier to get. And it resists nicely under high SPL, no distortion at all!
Music background: Live Sound Enginner

nice mic easy to use

I'm using it live right now. Good crisp sound that can get the bass drum out there even without subs. Eliminated a stand that players had a tendency to trip over on tight stages.
Music background: pro musician, engineer

Great mic for live sound

I would definitely recommend this mic for live kick drum applications. It's performance is excellent. The bass is tight & clearly defined. I used it on a Pearl Reference kick drum with Camco Vortex-6 amps & Nexo S2 subwoofers.
Music background: Live Sound Engineer

Sweetwater Advice

Sam Hillman

The Shure Beta 91A is my favorite mic to use inside of a kick drum, both live and in the studio. Its flat design means that it doesn't use a mic stand, so it's easy to place inside the drum. Being a boundary mic, it has a hemispherical polar pattern that picks up all of the tone and resonance inside the drum. This gives a more natural sound than a cardioid that primarily hears the attack of the batter head. For live situations, the midrange contour switch cuts boxy midrange frequencies for a great pre-shaped sound. In the studio, a tried-and-true combo I love is pairing the Beta 91A with a Beta 52.
See also: Condenser Mics, Shure, Shure Condenser Microphones