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 supplied 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
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 ohms Load –4 dBV (0.63 V), 150 ohms Load –15 dBV (0.18 V)
- Total Harmonic Distortion: Less than 0.5% (131 dB SPL at 250 Hz into 800 ohms load)
- Maximum SPL (at 1,000 Hz): 800 ohms load 136 dB (attenuator at 0)/146 dB (attenuator at –10) OR 150 ohms 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 OR 19 dB typical, weighted per DIN 45 405
- Signal-to-Noise Ratio: 78 dB (IEC 651) at 94 dB SPL
- Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3
- 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
- Operating Temperature: – 6.7degrees C to 49 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)
Shure SM81 Unidirectional Cardioid Condenser Microphone (code 28758)
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.
£284.11 (inc vat)