The SM81 is ruggedly constructed. It operates on phantom power and performs over a wide range of temperatures and humidity conditions. It is furnished with a swivel adapter, attenuator-switch lock, foam windscreen, and case for carrying and storage. Other accessories are available.

    20 Hz to 20 kHz frequency response
    Flat response curve for accurate reproduction of sound sources
    Low noise and high output clipping level
    Low distortion over a wide range of load impedances
    Cardioid polar pattern, uniform with frequency and symmetric about axis, providing maximum rejection and minimum coloration of off-axis sounds
    Low RF susceptibility
    Selectable low-frequency response: flat, 6 or 18 dB/octave rolloff
    0 dB/10 dB lockable attenuator switch
    Phantom powering (DIN 45 596 voltages of 12 to 48 Vdc)
    Rugged steel construction for durability
    Field-usable over wide range of temperature and humidity conditions

The Shure SM81 is a high-quality, unidirectional condenser microphone designed for studio recording, broadcasting, and sound reinforcement. Its wide frequency response, low noise characteristics, and low RF susceptibility have made it a standard for applications involving acoustic instruments, especially guitar, piano, and cymbals.

In the box:
    1 swivel adapter
    1 attenuator-switch lock
    1 foam windscreen