Item #: SHU BETA91A LIST

Shure Beta 91A Half Cardioid Boundary Condenser Microphone

Shop Shure Beta 91A Half Cardioid Boundary Condenser Microphone from AMS with 0% Interest Payment Plans and Free Shipping.
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Product Description

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).

Shure Beta 91A Condenser 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


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warning WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
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Helpful Info about the Manufacturer
Phone:  800-257-4873 Warranty:  2 Years

Product Specifications

Shure Beta 91A Condenser Microphone Specifications
  • Type: Electret Condenser
  • Frequency Response: 20 to 20,000 Hz
  • Polar Pattern: Half-cardioid (cardioid in hemisphere above mounting surface)
  • Impedance: 146 Ohms
  • Sensitivity (at 1 kHz, open circuit voltage):
    • -48.5 dBV/Pa (3.8mV)
    • 1 Pascal=94 dB SPL
  • Maximum SPL (1 kHz at 1% THD): 1000 Ohm load: 151 dB, 2500 Ohm load: 155 dB
  • Signal-to-Noise Ratio (referenced at 94 dB SPL at 1 kHz):
    • 64 dB
    • S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted
  • Dynamic Range (at 1 kHz):
    • 1000 Ohm load: 121.5 dB
    • 2500 Ohm load: 125.5 dB
  • Common Mode Rejection (20 Hz to 20 kHz): > 55 dB
  • Clipping Level (20Hz-20 kHz at 1% THD):
    • 1000 Ohm load: 7.50 dBV, 2500 Ohm load: 12.5 dBV
    • THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL
  • 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: 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, 5.6 mA


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