Shure Beta 91A Condenser Boundary 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 Shure Beta 91A combines superior attack and punch for studio-quality sound, even at extremely high sound pressure levels (SPL).

A 2-position contour switch maximizes 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 phantom power. Comes with zippered 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 dBS/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 dBVTHD 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