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Shure Incorporated

7/8

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 Hz

Power Requirements

11

52 

 V DC

 phantom power   , 5.4

 mA

Polarity

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

Weight

470

 g

(16.6

 oz.

)

Connector

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

 1 Pa=94 dB SPL   1 Pa=94 dB SPL   1 Pa=94 dB SPL   1 Pa=94 dB SPL   1 Pa=94 dB SPL

 THD of microphone preamplifier when applied input signal level is equivalent to cartridge output at specified SPL   THD of 

microphone preamplifier when applied input signal level is equivalent to cartridge output at specified SPL 

 THD of micro-

phone preamplifier when applied input signal level is equivalent to cartridge output at specified SPL 

 THD of microphone pre-

amplifier when applied input signal level is equivalent to cartridge output at specified SPL   THD of microphone preamplifier 

when applied input signal level is equivalent to cartridge output at specified SPL

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

 S/N ratio is the difference be-

tween 94 dB SPL and equivalent SPL of self-noise, A-weighted 

 S/N ratio is the difference between 94 dB SPL and equiva-

lent SPL of self-noise, A-weighted 

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

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

 All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower voltages, but with 

slightly decreased headroom and sensitivity 

 All specifications measured with a 48 Vdc phantom power supply. The micro-

phone operates at lower voltages, but with slightly decreased headroom and sensitivity   All specifications measured with a 48 

Vdc phantom power supply. The microphone operates at lower voltages, but with slightly decreased headroom and sensitivity 

 All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower voltages, but with 

slightly decreased headroom and sensitivity 

 All specifications measured with a 48 Vdc phantom power supply. The micro-

phone operates at lower voltages, but with slightly decreased headroom and sensitivity

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Summary of Contents for BETA91A

Page 1: ...BETA91A Half Cardioid Condenser Microphone The Shure half cardioid electret condenser microphone BETA91A user guide Version 3 1 2021 B...

Page 2: ...3 Features 3 Applications 3 General Rules for Use 3 Applications and Placement 3 Mounting the Microphone 4 Half cardioid Polar Pattern 4 Contour Switch 4 Load Impedance 5 Power Requirements 5 Accessor...

Page 3: ...grille and die cast metal construction resist wear and abuse Applications General Rules for Use This table lists the most common applications and placement techniques Keep in mind that microphone tec...

Page 4: ...t and placement to hammers for desired sound Bright well balanced strong attack excellent isolation Mount microphone vertically on the inside of the pi ano frame near the apex of the piano s curved wa...

Page 5: ...imum SPL capability output clipping level and dynamic range vary with the input load impedance of the preamplifier to which you connect the microphone Shure recommends a minimum input load impedance o...

Page 6: ...cy Response 20 to 20 000 Hz Polar Pattern Half cardioid cardioid in hemisphere above mounting surface Output Impedance 150 Sensitivity at 1kHz open circuit voltage 48 5 dBV Pa 3 8 mV Maximum SPL 1 kHz...

Page 7: ...s the difference between 94 dB SPL and equivalent SPL of self noise A weighted S N ratio is the difference be tween 94 dB SPL and equivalent SPL of self noise A weighted S N ratio is the difference be...

Page 8: ...e for CE marking The CE Declaration of Conformity can be obtained from www shure com europe compliance Authorized European representative Shure Europe GmbH Headquarters Europe Middle East Africa Depar...

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