The Shure Beta 91A Kick Drum Microphone is designed to accurately capture the punch and attack of low-frequency instruments such as kick (bass) drums. It features a wide frequency response well suited for capturing a variety of audio signals such as organ and piano. The flat, boundary design also aides in producing a strong, solid low-end response, as well as make it easy to mount inside of a bass drum. The Beta 91A is ideal for both recording and sound reinforcement alike.
| Transducer | Condenser (electret bias) |
| Polar Pattern | Cardioid |
| Frequency Response | 20 to 20,000 Hz |
| Dynamic Range (Typical) | 20Hz to 20kHz, less than 1% THD, 2.5 kilohm load |
| Signal-to-Noise Ratio | 59dB re 94dB SPL |
| Maximum Input Sound Level | 20Hz to 20kHz, less than 1% THD |
| Power Requirements | Phantom Power: 48 VDC +/- 4 Vdc (IEC-268-15/DIN 45 596), positive pins 2 and 3 |
| Output Impedance | 150 ohms (actual) |
| Output Connectors | 4.6m (15 ft) heavy-duty, two-conductor shielded, TA4F to TA3F connectors |
| Dimensions | 3.75 x 5.08 x 0.75" (95 x 129 x 19mm) |
| Weight | 13.5 oz (382 g) |