Shure Beta 91A Boundary Microphone


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Product Code: 9999-08641
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The Shure Beta 91A Boundary Microphone provides a strong low-end response and maximum gain-before-feedback due to its half-cardioid polar pattern. It features a two-position contour switch to maximize attack and clarity and a low-profile design.

The Shure Beta 91A Boundary Microphone is designed for use with kick drums, as well as other traditional low-frequency applications including piano. Featuring an updated microphone capsule, integrated preamplifier, and XLR connection, the Shure Beta 91A offers a strong low-frequency response and is specifically tailored for bass frequency applications. The Shure Beta 91A combines superior attack and punch for studio-quality sound, even at extremely high sound pressure levels (SPL).

Shure Beta 91A Boundary Microphone Features

  • Uniform half-cardioid polar pattern for maximum gain-before-feedback and rejection of off-axis sound
  • Precision-engineered low-profile design features integrated preamplifier and XLR connector to maximize setup efficiency while minimizing stage clutter
  • Frequency response tailored for kick drum/low frequency applications with a wide dynamic range for use in high SPL environments
  • Two-position contour switch to maximize attack and clarity depending on application: select the flat response setting for natural sound in most applications or the “low-mid scoop” setting for a strong low frequency “punch” with plenty of higher frequency attack
  • Requires no external mounting or accessories for ease of use and storage
  • Furnished with zipper pouch

Shure Beta 91A Boundary Microphone Specifications

  • Type: Condenser (Externally Biased)
  • Frequency Response: 20 to 20,000 Hz
  • Polar Pattern: Half-Cardioid (Cardioid in Hemisphere Above Mounting Surface)
  • Impedance: 146 O
  • Sensitivity (at 1 kHz, Open Circuit Voltage): -48.5 dBV/Pa (3.8 mV) 1 Pascal=94 dB SPL
  • Maximum SPL (1 kHz at 1% THD):
    • 1000 O Load: 151 dB
    • 2500 O Load: 155 dB
  • Signal-to-Noise Ratio (Referenced at 94 dB SPL at 1 kHz): 85.5 dB
  • Dynamic Range (at 1 kHz):
    • 1000 O Load: 121.5 dB
    • 2500 O Load: 125.5 dB
  • Common Mode Rejection (20 Hz to 20 kHz): > 55 dB
  • Clipping Level (20Hz-20 kHz at 1% THD):
    • 1000 O Load: 7.50 dBV
    • 2500 O Load: 12.5 dBV
  • Self Noise (Typical, Equivalent SPL, A-Weighted): 29.5 dB SPL-A
  • Polarity: Positive Pressure on Diaphragm Produces Positive Voltage on Pin 2 with Respect to Pin 3
  • Weight Net: 470 g (16.6 oz.)
  • Frequency Contour Switch: 7 dB of Attenuation Centered at 400 kHz
  • Connector: Three-pin Professional Audio (XLR), Male, Balanced
  • Power Requirements: 11-52 VDC Phantom Power (IEC-61938), 5.6 mA

Shure Beta 91A Boundary Microphone Includes

  • 1 x Shure Beta 91A Boundary Microphone
  • 1 x Shure 95A2314 Storage Bag
  • 1 Year Warranty

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3 Reviews Hide Reviews Show Reviews

  • 5
    Great Boundary Mic
    Jake Tavill

    Great to have in the kick live or in the studio for an added capture of the transients to mix in!

  • 5
    Great at what it does
    Jesse V

    This is a mic you'll really only pull out for one purpose, but it excels so much at what it does that you'll grab it every time. The go-to kick-in mic, providing a great amount of attack and definition and, depending on the genre, can work as the only kick mic you need. Pairs amazingly with the Beta56 as well.

  • 4
    Great sole purpose use microphone
    Cam S

    I brought this mic for a very specific purpose, to capture bass drum attack for aggressive/rowdy music, primarily to save from over-equalizing the primary bass drum microphone - for this purpose it is perfect. The 1-6" placement recommended didn't work for me, rather - placing the mic inside the bass drum around 1" from the resonant head pointing at the batter did, this had the capsule placed around 1/3rd of the way inside the drum head and gave the mic a reasonably balanced tone (otherwise it was unnaturally subby). Seems to me to be a very specific use mic, as-in 1-trick pony, hence only 4x stars instead of 5. As an aside I'm a total fanboy of Shure mics, particularly the KSM series, so, take this review with a pinch of salt.