Shure Beta 91A Half-Cardioid Condenser Microphone

Article number: BETA 91A
Availability: In stock
Delivery time: Usually ships in 3-5 business days

The Shure BETA®91A 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, Beta 91A offers a strong low-frequency response and is specifically tailored for bass frequency applications. The Beta 91A combines superior attack and punch for studio-quality sound, even at extremely high sound pressure levels (SPL).


  • 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


  • Cartridge Type: Electret Condenser
  • Polar Pattern: Half-cardioid (cardioid in hemisphere above mounting surface)
  • Frequency Response: 20 to 20,000 Hz
  • Output Impedance @ 1 kHz: 146 Ω
  • Sensitivity (open circuit voltage, @ 1 kHz, typical): –48.5 dBV/Pa[1] (3.8 mV)
  • - Maximum SPL (1 kHz at 1% THD) -
  • 2500 Ω load 155 dB
  • 1000 Ω load 151 dB
  • Signal-to-Noise Ratio: 64.5 dB
  • - Dynamic Range @ 1 kHz -
  • 2500 Ω load 125.5 dB
  • 1000 Ω load 121.5 dB
  • - Clipping Level (20 Hz to 20 kHz, 1% THD) -
  • 2500 Ω load 12.5 dBV
  • 1000 Ω load 7.5 dBV
  • Self Noise (equivalent SPL, A-weighted, typical): 29.5 dB SPL-A
  • Common Mode Rejection(20 Hz to 200 kHz): ≥55 dB
  • Frequency Contour Switch: 7 dB of attenuation centered at 400 kHz
  • Connector: Three-pin professional audio (XLR), male, balanced
  • Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
  • Power Requirements: 11–52 V DC[4] phantom power (IEC-61938), 5.4 mA
  • Net Weight: 470 g (16.6 oz.)
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