Shure BETA 91A - Manual (Page 4)

Power Requirements
This microphone requires phantom power and performs best with a 48 Vdc supply
(IEC-61938). However, it will operate with slightly decreased headroom and sensitivity
with supplies as low as 11 Vdc.
Most modern mixers provide phantom power. You must use a balanced microphone
cable: XLR-to-XLR or XLR-to-TRS.
SPECIFICATIONS
Accessories and Parts
Furnished Accessories
Cardioid Cartridge RPM98A/C
Replacement Parts
Optional Accessories
Zippered Carrying Bag 95A2314
7.6 m (25 ft.) Cable C25E
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC Directive 2004/108/EC.
Meets Harmonized Standards EN55103-1:1996 and EN55103-2:1996, for residential
(E1) and light industrial (E2) environments.
The Declaration of Conformity can be obtained from:
Authorized European representative:
Shure Europe GmbH
Headquarters Europe, Middle East & Africa
Department: EMEA Approval
Wannenacker Str. 28
D-74078 Heilbronn, Germany
Phone: +49 7131 72 14 0
Fax: +49 7131 72 14 14
Email: [email protected]
Load Impedance
Maximum SPL capability, output clipping level, and dynamic range vary with the in-
put load impedance of the preamplifier to which you connect the microphone. Shure
recommends a minimum input load impedance of 1000 Ω. Most modern microphone
preamplifiers meet this requirement. Higher impedance results in better performance
for these specifications.
Cartridge Type Electret Condenser
Polar Pattern Half-cardioid (cardioid in hemisphere above mount-
ing surface)
Frequency Response 20 to 20,000 Hz
Output Impedance
@ 1 kHz
146 Ω
Sensitivity
open circuit voltage, @ 1 kHz, typical
–48.5 dBV/Pa [1] (3.8 mV)
Maximum SPL
1 kHz at 1% THD [2]
2500 Ω load 155 dB
1000 Ω load 151 dB
Signal-to-Noise Ratio [3] 64.5 dB
Dynamic Range
@ 1 kHz
2500 Ω load 125.5 dB
1000 Ω load 121.5 dB
Clipping Level
20 Hz to 20 kHz, 1% THD
2500 Ω load 12.5 dBV
1000 Ω load 7.5 dBV
Self Noise
equivalent SPL, A-weighted, typical
29.5 dB SPL-A
Common Mode Rejection
20 Hz to 200 kHz
≥55 dB
Frequency Contour Switch 7 dB of attenuation centered at 400 kHz
Connector Three-pin professional audio (XLR), male, balanced
Polarity Positive pressure on diaphragm produces positive
voltage on pin 2 with respect to pin 3
Power Requirements 11–52 V DC [4] phantom power (IEC-61938), 5.4 mA
Net Weight 470 g (16.6 oz.)
[1] 1 Pa=94 dB SPL
[2] THD of microphone preamplifier when applied input signal level is equivalent to cartridge output
at specified SPL
[3] S/N ratio is the difference between 94 dB SPL and equivalent SPL of self noise, A-weighted
[4] All specifications measured with a 48 Vdc phantom power supply. The microphone operates at
lower voltages, but with slightly decreased headroom and sensitivity.
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