Micro statique SHURE SM 81

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 94 dB SPL and product's equivalent self noise (SPL 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

Dimensions

See User Guide

Weight

Net: 230 grams (8 oz)

Packaged: 740 grams (1 lb 10 oz)