Shure Beta 91A

The Shure Beta 91A is designed for use with kick drums, piano and other traditional low frequency applications. Tailored for bass-heavy environments, this microphone features a powerful low frequency response and integrated 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).

PRis: Ring


Type: Electret Condenser
Frequency Response: 20 to 20,000 Hz
Polar Pattern: Half-cardioid (cardioid in hemisphere above mounting surface)
Output Impedance: 150 Ω
Sensitivity at 1 kHz: -48.5 dBV/Pa(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 (at 1 kHz):
2500 Ω load: 125.5 dB
1000 Ω load: 121.5 dB
Clipping Level (20 Hz to 20 kHz, at 1% THD):
2500 Ω load: 12.5 dB
1000 Ω load: 7.5 dB
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 Hz
Power Requirements: 11–52  V DC phantom power, 5.4 mA
Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3