Description
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).
- 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
- Polarity
- Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
