Free Shipping!!!

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.

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

Features:

• 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

Specifications:

• 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 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, 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)