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 |
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• Uniform cardioid (hemisphere above mounting surface) pick up pattern for maximum gain and rejection of off axis sound |
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• Tailored frequency response specifically shaped for kick drums and bass instruments |
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• Wide dynamic range for use in high sound pressure level (SPL) environments |
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• Low profile design requires no external mounting hardware |
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• Steel grille and die-cast metal construction resist wear and abuse |
BETA 91 |
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Furnished with RPM626 preamplifier, TA3F to TA4F cable and zippered storage bag |
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Phantom powered |
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• Shure quality, ruggedness and reliability |
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Available Models
BETA 91 Half-cardioid condenser kick-drum microphone with RPM626 in-line preamplifier
Specifications
Cartridge Type |
Condenser (electret bias) |
Frequency Response |
20 to 20,000 Hz |
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Polar Pattern |
Half-cardioid (cardioid in hemisphere above mounting |
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surface) |
Output Impedance |
150 ohms |
Maximum SPL |
156 dB |
(1 kHz at 1% THD, 1k ohms load) |
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Signal-to-Noise Ratio |
59.0 dB |
(referenced at 94 dB SPL at 1 kHz) |
S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted |
Dynamic Range |
125 dB |
(at 1 kHz, 1 k ohms load) |
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Clipping Level |
2 dBV (1.26 V) |
(1 kHz at 0.25% THD, 1k ohms load) |
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Polarity |
Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3 |
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Weight |
Net: 0.382 kg (0.842 lbs) |
Power Requirements |
(48 Vdc ±4 Vdc phantom) |
Furnished Accessories
C98D |
4.6 m (15 ft) heavy-duty cable |
95A2314 |
Carrying/Storage Bag |
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RPM626 |
In-Line Preamplifier (1 piece) |
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Polar Pattern |
Frequency Response |
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125 Hz |
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2500, |
5000 Hz |
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250 Hz |
6300, |
10000 Hz |
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500, 1000 Hz |
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15000 Hz |
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+20 |
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+10 |
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dB |
0 |
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–10 |
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–20 |
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2 |
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5 6 7 89 |
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3 |
4 |
5 6 7 89 |
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20 |
50 |
100 |
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1000 |
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10000 20000 |
Hz
www.shure.com |
©2010 Shure Incorporated |
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