Shure BETA 91A User Manual

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: EMEAsupport@shure.de
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.
4

Shure BETA 91A Specifications

General

Type	Stage/performance microphone
RF power	3.8 mW
Noise reduction	Yes
Microphone frequency	20 - 20000 Hz
Microphone sensitivity	-48.5 dB
Microphone direction type	Cardioid
Device interface	XLR-3
Connectivity technology	Wired
Cable length	7.6 m
Product color	Blue
Power consumption	5.4 mA
Impedance	146 Ω
Depth (imperial)	5.48 \
Width (imperial)	3.74 \
Height (imperial)	0.8 \
Power requirements	11-52V
Number of products included	1 pc(s)
Signal-to-Noise Ratio (SNR)	64.5 dB

Weight and Dimensions

Depth	139.1 mm
Width	95.11 mm
Height	20.3 mm
Microphone weight	470 g
Microphone dimensions (D x H)	139.1 x 20.3 mm