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Shure Incorporated

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Application

Suggested Microphone Placement

Tone Quality

Kick Drum

Inside drum, on a pillow or other cushioning surface, 25 

to 152 mm (1 to 6 in.) from beater head.

Full, natural sound.

Contour switch activated; 25 to 152 mm (1 to 6 in.) 

from beater head.

Sharp attack; maximum bass 

“punch.”

Piano

Mount microphone on underside of lid over lower treble 

strings. Experiment with lid height 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 wall.

Full, natural; excellent isolation and 

minimal hammer and damper noise.

Mounting the Microphone

If desired, attach the microphone to a prepared surface using the mounting holes on the bottom of the microphone.

Half-cardioid Polar Pattern

This boundary microphone has a cardioid polar pattern in the hemisphere above the mounting surface. Keep sound sources 

within a 60° range above this surface.

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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