All measurements taken with microphone mounted on a wooden surface 76.2 cm x 76.2 cm (30 in. x 30 in.). Frequency Response 50 to 17,000 Hz Polar Pattern Cardioid (MX393/C) Output Impedance EIA Rated at 150 ohms (180 ohms actual) Sensitivity (at 1 kHz, open circuit voltage) Cardioid Cartridge: -27.5 dBV/Pa (42.2 mV) 1 Pascal=94 dB SPL Maximum Sound Pressure Level (1 kHz at 1% Total Harmonic Distortion, 1 k ohm load) Cardioid: 117.0 dB Signal to Noise Ratio (referenced at 94 dB SPL) Cardioid: 71.0 dB Equivalent Output Noise (A-weighted) Cardioid: 23.0 dB Dynamic Range 94.0 dB Common Mode Rejection 45 dB minimum, 10 Hz to 100 kHz Switch Attenuation 50 dB minimum Preamplifier Output Clipping Level -6 dBV (0.5 V) Polarity Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output connector. Logic Connections (MX392 Only) LED IN: Active low (1.0v), TTL compatible. Absolute maximum voltage: -0.7V to 50V. SWITCH OUT: Active low (0.5V), sinks up to 20mA, TTL compatible. Absolute maximum voltage: -0.7V to 24V (up to 50V through 3 k ohms). Power Requirements 11 to 52 Vdc phantom 2.0 mA current consumption Environmental Requirements Operating Temperature Range: -18 to 57 degrees C (0 to 135 degrees F) Relative Humidity: 0 to 95%