Shure BETA 91A Half-Cardioid Condenser Microphone

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:

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

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

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