The Shure SM81 is a fine quality, unidirectional condenser microphone designed for studio recording, broadcasting, and sound reinforcement. Its wide frequency response, low noise characteristics, and occasional RF susceptibility have made it an ordinary for applications involving acoustic instruments, particularly guitar, piano, and cymbals.
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0 Hz to 20 kHz frequency response
Selectable low-frequency response: flat, 6 or 18 dB/octave rolloff
Low noise and prime output clipping level
Cardioid polar development, uniform with frequency and symmetric about axis, providing most rejection and minimum coloration of off-axis sounds
Phantom powering (DIN 45 596 voltages of 12 to 48 Vdc)