Shure Microphone, Shure  SM81-LC Studio/ Live Condenser XLR, 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:

• Steel construction with vinyl metallic paint finish and stainless steel screens make up the stylish case
• Flat response curve for accurate reproduction of sound sources
• 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 roll off
• 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
• Output Configuration and Connector: Balanced, transformer-coupled output; male XLR connector
• Low noise and high output clipping level
• Low distortion over a wide range of load impedances

Specification

• 20 Hz to 20 kHz frequency response
• Output Impedance: Rated at 150 ohms (85 Ù actual)
• Recommended minimum load impedance: 800 Ù (May be used with loads as low as 150 Ù with reduced clipping level)
• 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 Ù Load –4 dBV (0.63 V), 150 Ù Load –15 dBV (0.18 V)
• Total Harmonic Distortion: Less than 0.5% (131 dB SPL at 250 Hz into 800 Ù load)
• Maximum SPL (at 1,000 Hz): 800 Ù load 136 dB (attenuator at 0), 146 dB (attenuator at –10), 150 Ù 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.
• Over voltage 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.
• 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
• 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 (72_to 80_ F, 22_ to 27_ C)
• Weight: Net 230 grams (8 oz), Packaged 740 grams (1 lb 10 oz)

 


 
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