Shure Beta 91A Instrument Microphone


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Available for immediate shipment and pick-up from our Jamaica, New York location. In-store pick-up is available Monday through Friday from 8:30 am to 5:30 pm
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  • The Shure Beta 91A is designed for use with kick drums, piano and other traditional low frequency applications. An updated microphone capsule is tailored for bass-heavy environments to produce a powerful low frequency response, and a new design integrates the preamplifier and XLR connection for easy setup and minimal stage clutter. The Beta 91A combines superior attack and punch for studio-quality sound, even at extremely high sound pressure levels (SPLs).


    • Premier live performance microphone with Shure quality, ruggedness, and reliability
    • Uniform half-cardioid polar pattern (in the hemisphere above mounting surface) for maximum gain before feedback and rejection of off-axis sound
    • Tailored frequency response for kick drums and bass-heavy instruments
    • Wide dynamic range for use in high SPL environments
    • Two-position contour switch enhances attack and clarity
    • Integrated preamp and XLR connector reduce stage clutter and provide a quick, secure setup
    • Low profile design requires no external mounting hardware
    • Steel grille and die-cast metal construction resist wear and abuse
    • Exceptional low-frequency reproduction
    • Extremely high SPL handling
    • High output level
    • No crossover distortion
  • TypeElectret 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 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, 5.6 mA
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