The Shure Beta 91A is a boundary microphone that can double as a kick drum mic, as it can 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.
Features
Uniform half-cardioid polar pattern for maximum gain-before-feedback and rejection of off-axis sound
Low-profile design features integrated preamplifier and XLR connector to facilitate 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
Furnished with zipper pouch
Specifications
Microphone
| Capsule | Electret Condenser |
| Polar Pattern | Half-Cardioid |
| Tone Adjustment | Low Cut: -7 dB at 400 kHz |
| On-Board Controls | LF |
Performance
| Frequency Range | 20 Hz to 20 kHz |
| Maximum SPL | 155 dB SPL (1 kHz, 1% THD, 1-Kilohm Load) 151 dB SPL (1 kHz, 1% THD, 2.5-Kilohms Load) |
| Impedance | 146 Ohms |
| Sensitivity | -48.5 dBV/Pa 3.8 mV/Pa |
| Dynamic Range | 125.5 dB |
| Signal-to-Noise Ratio | 64.5 dB |
| Equivalent Noise Level | 29.5 dB SPL A-Weighted (Typical) |
| CMRR | 55 dB |
Connectivity
| Output Connectors (Analog) | 1 x XLR 3-Pin |
Power
| Operating Voltage | 11 to 52 V (Phantom Power) |
| Operating Current Consumption | 5.4 mA |
Physical
| Dimensions | H: 3.7 x W: 0.8 x L: 5.5″ / H: 95.1 x W: 20.3 x L: 139.1 mm |
| Weight | 16.6 oz / 470 g |
Packaging Info
| Package Weight | 1.85 lb |
| Box Dimensions (LxWxH) | 10 x 5 x 3.4″ |
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