Shure Beta 91A Boundary Microphone

Shure Beta 91A Overview

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.

• 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

Shure Beta 91A Specs

Key Specs

Polar Pattern : Half-Cardioid
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-Kilohm Load)
Power Sources : Phantom Power

Microphone

Element Type : Electret Condenser
Polar Pattern : Half-Cardioid
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-Kilohm Load)
Sensitivity : -48.5 dBV/Pa 3.8 mV/Pa
Dynamic Range : 125.5 dB
Signal-to-Noise Ratio : 64.5 dB
CMRR : 55 dB

Power

Power Sources : Phantom Power
Operating Voltage : 11 to 52 V (Phantom Power)
Operating Current Consumption : 5.4 mA