Shure Beta 91 Specification Sheet

Product Specifications

Beta 91 Half-cardioid Condenser Boundary Microphone

Overview

The Shure Beta 91 is specifically designed for kick drums and other bass instruments. It combines superior “attack” and “punch” for studio
quality sound, even at the extremely high sound pressure levels (SPL) encountered inside a kick drum. Its boundary effect design produces a
strong, solid low-end response that has been specifically tailored for heavy bass applications.

Features

• Premier live performance microphone

• Uniform cardioid (hemisphere above mounting surface) pick up pattern for maximum gain and rejection of off axis sound

• Tailored frequency response specifically shaped for kick drums and bass instruments

• Wide dynamic range for use in high sound pressure level (SPL) environments

• Low profile design requires no external mounting hardware

• Steel grille and die-cast metal construction resist wear and abuse

• Furnished with RPM626 preamplifier, TA3F to TA4F cable and zippered storage bag

• Phantom powered

• Shure quality, ruggedness and reliability

Available Models

BETA 91

Specifications

Cartridge Type Condenser (electret bias)
Frequency Response 20 to 20,000 Hz

Polar Pattern Half-cardioid (cardioid in hemisphere above mounting

Output Impedance 150 ohms
Maximum SPL

(1 kHz at 1% THD, 1k ohms load)
Signal-to-Noise Ratio

(referenced at 94 dB SPL at 1 kHz)
Dynamic Range

(at 1 kHz, 1 k ohms load)
Clipping Level

(1 kHz at 0.25% THD, 1k ohms load)

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

Weight Net: 0.382 kg (0.842 lbs)
Power Requirements (48 Vdc ±4 Vdc phantom)

Half-cardioid condenser kick-drum microphone with RPM626 in-line preamplifier

surface)

156 dB

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

125 dB

2 dBV (1.26 V)

BETA 91

Furnished Accessories

C98D

RPM626

4.6 m (15 ft) heavy-duty cable

In-Line Preamplifier (1 piece)

125 Hz
250 Hz
500, 1000 Hz

Polar Pattern

95A2314

2500, 5000 Hz
6300, 10000 Hz
15000 Hz

Carrying/Storage Bag

+20

+10

0

dB

–10

–20

Frequency Response

98765432 98765432

20 50 100 1000 10000 20000

Hz

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