The Shure Model 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.
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.
Features
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
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
About Shure
S.N. Shure began his company's relationship with the products of personal sound by launching a one-man operation in 1925 that sold radio parts kits. Since then, Shure microphones and audio electronics have been the tools of choice for politicians, musicians, corporations, churches, and broadcasters across the world. Anyone who considers sound to be an important part of his or her self-expression has probably used one of Shure's microphones, phonograph needles, or other professional audio products.
Technical Info
Type: Condenser (electret bias)
Frequency Response: 20 to 20,000 Hz
Polar Pattern: Cardioid (unidirectional) response
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Personal use items that are used at your mouth or in your ear cannot be returned once opened due to health laws. This includes all microphones, guitar talk boxes, ear plugs, and in-ear earphones. 
