Shure Beta 91A Kickdrum 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).
Transducer | Condenser (electret bias) |
Polar Pattern | Half-cardioid |
Frequency Response | 20 to 20,000 Hz |
Output Impedance | 146 Ohms |
Sensitivity | -48.5 dBV/Pa (3.8 mV) |
Maximum SPL | 2500-Ohm load: 155 dB (1 kHz at 1% THD) 1000-Ohm load: 151 dB (1 kHz at 1% THD) |
Maximum Input Sound Level | 20 Hz to 20 kHz, less than 1% THD |
Signal-to-Noise Ratio | 64.5 dB |
Dynamic Range | 2500-Ohm load: 125.5 dB (1 kHz at 1% THD) 1000-Ohm load: 121.5 dB (1 kHz at 1% THD) |
Clipping Level | 2500-Ohm load: 12.5 dBV 1000-Ohm load: 7.5 dBV |
Self Noise (Equivalent SPL) | 29.5 dB SPL (A-weighted) |
Common Mode Rejection | ≥55 dB (20 Hz to 200 kHz) |
Switch | Frequency Contour Switch: 7 dB of attenuation centered at 400 kHz |
Power Requirements | Phantom Power: 48 VDC +/- 4 Vdc (IEC-268-15/DIN 45 596), positive pins 2 and 3 |
Polarity | Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 |
Power Requirements | 11 to 52 VDC phantom power, 5.4 mA |
Output Connectors | 1 x XLR male, balanced |
Dimensions | 3.7 x 5.5 x 0.8″ (95.1 x 139.1 x 20.3 mm) |
Weight | 16.6 oz (470 g) |