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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, no cable. Phantom power required.
- Type
- Condenser (electret bias)
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- Frequency Response
- 20 to 20,000 Hz
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 view
larger -
- Polar Pattern
- Cardioid (unidirectional) response-uniform with frequency,
symmetrical about axis
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- Output Impedance
- Rated at 150 ohms (85 ohms actual)
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- Recommended minimum load impedance: 800 ohms (May be used with
loads as low as 150 ohms with reduced clipping level)
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- Output Configuration and Connector
- Balanced, transformer-coupled output; male XLR connector
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- Sensitivity (at 1,000 Hz)
- Open Circuit Voltage: -45 dBV/Pascal (5.6 mV
(1 Pascal = 94 dB SPL)
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- Clipping Level (at 1,000 Hz)
- 800 ohm Load: -4 dBV (0.63 V)
- 150 ohm Load: -15 dBV (0.18 V)
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- Total Harmonic Distortion
- Less than 0.5% (131 dB SPL at 250 Hz into 800 ohm load)
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- 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)
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- Hum Pickup
- -3 dB equivalent SPL in a 1 mOe field (60 Hz)
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- Self-Noise (equivalent sound pressure levels;
measured with true rms voltmeter)
- 16 dB typical, A-weighted
- 19 dB typical, weighted per DIN 45 405
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- 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).
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- 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)
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- Polarity
- Positive pressure on diaphragm produces positive voltage on pin 2
relative to pin 3
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- Cartridge Capacitance
- 54 pF
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- Low Frequency Response Switch Positions
- Flat; -6 dB/octave below 100 Hz; -18 dB/octave below 80 Hz
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- Attenuator Switch Positions (Lockable)
- 0 or -10 dB
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- Power
- Supply Voltage: 11 to 52 Vdc, positive, pins 2 and 3
- Current Drain: 1.2 mA max.
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- 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)
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- Case
- Steel construction with vinyl metallic paint finish and stainless
steel screens
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- Dimensions
- See User Guide
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- Weight
- Net: 230 grams (8 oz)
- Packaged: 740 grams (1 lb 10 oz)
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