The Shure SM81 is a high-quality, unidirectional condenser microphone designed for the most demanding professional applications in studio recording, broadcasting, and sound reinforcement. It is especially suitable for applications requiring extremely wide frequency response, low noise and distortion characteristics, very low RF susceptibility, and reliable operation over a wide range of temperature and humidity extremes. The case is constructed of steel for ruggedness, with a stainless steel screen, and finished in durable vinyl paint. |
| Type: | Condenser (electret bias) | | Frequency Response: | 20 Hz to 20 kHz | | Polar Pattern: | Cardioid (unidirectional), uniform with frequency,
symmetrical about axis | | Impedance: | Rated impedance is 150 ohm (85 ohm actual)
Recommended minimum load impedance: 800 ohm | | Sensitivity (at 1 kHz): | Open Circuit Voltage -45.0 dBV/Pa (5.6 mV);
1 Pascal = 94 dB SPL | | Phasing: | Positive pressure on the diaphragm produces positive voltage on
pin 2 with respect to pin 3 | | Output Configuration and Connector: | Balanced, transformer-coupled output; male XLR connector | | Case: | Steel construction with vinyl metallic paint finish
and stainless steel screens | | Maximum SPL (at 1 kHz 150 ohm): | 128 dB (attenuator at 0); 138 dB (attenuator at -10) | | Phantom Supply Requirement: | 11 to 52 VDC, positive, pins 2 and 3 |
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