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.

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

Specifications

• Impedance: 85

Dimensions and Weight

• Width: 0.925 in (23.5 mm)
• Height: 8.346 in (212.0 mm)
• Depth: 0.925 in (23.5 mm)
• Weight: 0.507 lb (230 g)

Impedance: Rated at 150 ohms (85 ohms actual) Output Clipping Level: 800 ohm Load: -4 dBV (0.63 V) 150 ohm Load: -15 dBV (0.18 V) Hum Pickup -3 dB equivalent SPL in a 1 mOe field (60 Hz)