Shure SM81
The legendary SM81 is an industry-standard, flat-response cardioid condenser microphone, featuring a wide frequency response and low self-noise.
Highly versatile, the SM81’s renowned sonic accuracy is a constant choice around the world for acoustic stage and studio performance, including guitar,
piano and drum overhead applications.
- Description
- Technical Specification
Description
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
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 Ω (85 Ω actual)
Recommended minimum load impedance: 800 Ω
Output Clipping Level: 800 Ω Load: -4 dBV (0.63 V)
150 Ω Load: -15 dBV (0.18 V)
Maximum SPL: (at 1,000 Hz) 800 Ω load: 136 dB (attenuator at 0) 146 dB (attenuator at -10)
150 Ω 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: 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)
Weight: 230 g
Dimensions: 212 mm L x 23.5 mm W
