Shure BETA91A Boundry Microphone

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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.

Wide Frequency Response

Cardioid Polar Pattern

Interchangeable Cartridge

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

Capsule	Electret Condenser
Polar Pattern	Half-Cardioid
Tone Adjustment	LF 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	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 / 0.470 kg