
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).

Features
Tech Specs
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[2]: 2500 Ω load 155 dB 1000 Ω load 151 dB
Signal-to-Noise Ratio[3]: 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.)