BETA 91A BETA Series Half-Cardioid Condenser Microphone

BETA Series Half-Cardioid Condenser Microphone
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Shure Incorporated
Mac & Win
In Stock: YES Total on hand: 9 As of 05/19/2022
Availability: In stock

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).

A low-profile microphone requiring no external mounting hardware. Lies flat on a pillow or other surface inside a kick drum for superb attack and low-end punch.

Uniform half-cardioid polar pattern for maximum gain-before-feedback and rejection of off-axis sound

Precision-engineered low-profile design features integrated preamplifier and XLR connector to maximize 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

Requires no external mounting or accessories for ease of use and storage

Furnished with zipper pouch


Electret Condenser


Frequency Response

20 to 20,000 Hz


Polar Pattern

Half-cardioid (cardioid in hemisphere above mountingsurface)



146 Ohms


Sensitivity (at 1 kHz, open circuit voltage)

-48.5 dBV/Pa (3.8mV)

1 Pascal=94 dB SPL


Maximum SPL (1 kHz at 1% THD)

1000 Ohm load: 151 dB, 2500 Ohm load: 155 dB


Signal-to-Noise Ratio (referenced at 94 dB SPL at 1 kHz)

64 dB

S/N ratio is difference between 94 dB SPL and equivalent SPLof self noise, A-weighted


Dynamic Range (at 1 kHz)

1000 Ohm load: 121.5 dB

2500 Ohm load: 125.5 dB


Common Mode Rejection (20 Hz to 20 kHz)

> 55 dB


Clipping Level (20Hz-20 kHz at 1% THD)

1000 Ohm load: 7.50 dBV, 2500 Ohm load: 12.5 dBV

THD of microphone preamplifier when applied input signal isequivalent to cartridge output at specified SPL


Self Noise (typical, equivalent SPL, A-weighted)

29.5 dB SPL-A



Positive pressure on diaphragm produces positive voltage onpin 2 with respect to pin 3



Net: 470 g (16.6 oz.)


Frequency Contour Switch

7 dB of attenuation centered at 400 kHz



Three-pin professional audio (XLR), male, balanced


Power Requirements

11-52 Vdc phantom power, 5.6 mA

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