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Shure SM81 Instrument Microphone
SKU
SHSM81LC
Technical Specifications:The Shure Model 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.
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.
Features:
- 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
Technical Specifications:
- Type: Condenser (electret bias)
- Frequency Response: 20 to 20,000 Hz
- Output Impedance: Rated at 150 ohms (85 ohm actual) Recommended minimum load impedance: 800 ohm (May be used with loads as low as 150 Ω 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 (0.63V) 150 ohm Load –15 dBV (0.18V) Load –4 dBV (0.63 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 microphone output at 94 dB SPL and microphone 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
- Polar Pattern: Cardioid (unidirectional) response—uniform with frequency, symmetrical about axis
- 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 to 74 C (–20 to 165 F) Operating – 6.7 to 49 C (20 to 120 F)
- Humidity:
- Storage: 0–95% relative humidity at room temperature (72to 80 F, 22 to 27 C)
- Case: Steel construction with vinyl metallic paint finish and stainless steel screens
- Weight:
- Packaged: 740 grams (1 lb 10 oz)
1 year limited guarantee
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