SHURE SM81 Instrument Microphone

SHURE SM81 Instrument Microphone
The Shure SM81 is a high-quality, unidirectional condenser microphone designed for studio recording, broadcasting, and sound reinforcement.

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.
  • 0 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
  • SM81-LC with windscreen, without cable. Phantom power required.
  • One of the world's greatest studio condenser mics, the SM81 is a flat response mic with a selectable, low-frequency response switch -- flat, 6dB/octave roll-off or 18dB/octave roll-off -- and a 10dB attenuator. Cardioid, Condenser.
Our Price$999.00
CodeSHRSM81

  • Type Condenser (electret bias)
  • Frequency Response 20 to 20,000 Hz
  • Polar Pattern Cardioid (unidirectional) response-uniform with frequency, symmetrical about axis
  • Output Impedance Rated at 150 ohms (85 ohms actual)
  • Recommended minimum load impedance: 800 ohms (May be used with loads as low as 150 ohms with reduced clipping level)
  • Output Configuration and Connector Balanced, transformer-coupled output; male XLR connector
  • Sensitivity (at 1,000 Hz) Open Circuit Voltage: -45 dBV/Pascal (5.6 mV) (1 Pascal = 94 dB SPL)
  • Clipping Level (at 1,000 Hz) 800 ohm Load: -4 dBV (0.63 V) 150 ohm Load: -15 dBV (0.18 V)
  • Total Harmonic Distortion Less than 0.5% (131 dB SPL at 250 Hz into 800 ohm load)
  • 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)
  • Hum Pickup -3 dB equivalent SPL in a 1 mOe field (60 Hz)
  • Self-Noise (equivalent sound pressure levels; measured with true rms voltmeter) 16 dB typical, A-weighted 19 dB typical, weighted per DIN 45 405
  • Signal-to-Noise Ratio 78 dB (IEC 651)* at 94 dB SPL *S/N ratio is difference between 94 dB SPL and product's equivalent self noise (SPL 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
  • Cartridge Capacitance 54 pF
  • Low Frequency Response Switch Positions Flat; -6 dB/octave below 100 Hz; -18 dB/octave below 80 Hz
  • Attenuator Switch Positions (Lockable) 0 or -10 dB
  • Power Supply Voltage: 11 to 52 Vdc, positive, pins 2 and 3 Current Drain: 1.2 mA max.
  • Environmental Conditions Temperature: Storage: -29 degrees to 74 degrees C (-20 degrees to 165 degrees F) Operating: -6.7 degrees to 49 degrees C (20 degrees to 120 degrees F) Humidity: Storage 0 to 95% relative humidity at room temperature (72 degrees to 80 degrees F, 22 degrees to 27 degrees C)
  • Case Steel construction with vinyl metallic paint finish and stainless steel screens Weight Net: 230 grams (8 oz) Packaged: 740 grams (1 lb 10 oz)
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