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.
SM81-LC with windscreen, without cable. Phantom power required.
|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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