Shure SM81-LC Cardioid Condenser Microphone

Overview 

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

• Uniform cardioid pick-up pattern for maximum gain before feedback and excellent rejection of off-axis sound
• Flat frequency response for accurate reproduction of sound sources; 20 Hz to 20 kHz
• Selectable low frequency response; flat, 6 or 18 dB/octave roll off
• Vinyl-coated steel construction and stainless steel screen resist wear and abuse
• Low noise and high sound pressure level (SPL) handling
• Minimally affected by varying load impedances
• Low susceptibility to RFI
• Lockable 10 dB attenuator switch
• Performs over a wide range of temperature and humidity conditions
• Phantom powered
• Shure quality, ruggedness, and reliability

Specifications

• Type: Electret Condenser
• Frequency Response: 20 to 20,000 Hz
• Polar Pattern: Cardioid 
• Output Impeadance: EIA rated at 150 Ω (85 actual)
• Sensitivity (at 1 kHz, open circuit voltage): -45 dBV/Pa
• Maximum SPL (1 kHz at 1% THD, 1 kΩ load): 136 dB SPL
• Signal-To-Noise Ratio (Ref. 94 dB SPL at 1 kHz): 78 dB
• Clipping Level (1 kHz at 0.25% THD, 1 kΩ load): -4 dBV (0.63 V)
• Hum Pickup (typical, at 60 Hz, equivalent SPL/mOe): -3 dB
• Polarity: Positive pressure on diaphgragm produces positive voltage on pin 2 with respect to pin 3
• Net Weight: 0.230 kg (0.5 lbs)
• Packaged Weight: 0.740 kg (1.625 lbs)
• Attenuator Switch: - or -10 dB, lockable
• Connector: Three-pin professional audio (XLR), male
• Housing: Steel construction with vinyl metallic paint finish and stainless steel screens
• Operating Temperature: -6.7° to 49° C (20° to 120° F)
• Storage Temperature: -29° to 74° C (-20° to 165° F)
• Relative Humidity: 0 to 95%

What's in the Box?

• SM81 Condenser Mic
• Swivel Adaptor
• Attenuator-switch lock 
• Foam windscreen
• Carrying case