By: Shure
Microphones, Headphones & Wireless systems
Contact us for lowest price (800) 284-2288, (858) 565-1101,, or fax (858) 300-4193
Instrument Microphone
The Shure SM Microphones Series SM-81 is a high-quality, unidirectional condenser microphone designed for studio recording, broadcasting, and sound reinforcement. The SM 81 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.
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
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
Type Condenser
Frequency Response 20 to 20,000 Hz
Polar Pattern Cardioid
Sensitivity (at 1,000 Hz) Open Circuit Voltage -45 dBV/Pascal (5.6 mV) (1 Pa = 94 dB SPL)
Impedance Rated at 150 ohms (85 ohms actual); Recommended minimum load impedance: 800 ohms
Output Clipping Level 800 ohm Load: -4 dBV (0.63 V); 150 ohm Load: -15 dBV (0.18 V)
Maximum SPL (at 1,000 Hz) 800 ohm load 136 dB (attenuator at 0) 146 dB (attenuator at -10); 150 ohm load: 128 dB (attenuator at 0) 138 dB (attenuator at -10)
Self-Noise 16 dB typical, A-weighted; 19 dB typical, weighted per DIN 45 405
Hum Pickup -3 dB equivalent SPL in a 1 mOe field (60 Hz)
Signal-to-Noise Ratio 78 dB (IEC 651) at 94 dB SPL; S/N ratio is difference between 94 dB SPL and equivalent SPL of self– noise A-weighted
Overvoltage and Reverse Polarity Protection Max. external voltage applied to pins 2 and 3 with respect to pin 1: 52 Vdc; Reverse polarity protection: 200 mA max. (diode-clamped)
Polarity Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3
Power 11 to 52 vdc, 1.2 mA
Case Steel construction with vinyl metallic paint finish and stainless steel screens
Connector Three-pin professional audio connector (male XLR type)
Net Weight 230 grams (8 oz)
Dimensions 212 mm (7-9/16 in.) L x 23.5 mm (2 in.) W at the widest point
Selectable low-frequency response flat, 6 or 18 dB/octave rolloff

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Prices and specifications subject to change without notice.