Microflex�Boundary Microphones are the high-quality solution for a range of applications such as altars, boardrooms and distance learning centers. Every Microflex Boundary microphone features a choice of interchangeable condenser cartridges. The MX391 includes an attached 4 meter (12 ft) cable terminated with a 4-pin mini connector and separate preamplifier. A rubber strain relief is provided for applications that require removing the 4-pin mini connector and connecting the mic cable directly to screw terminals in the preamplifier. Environmental Requirements Operating Temperature Range: -18 to 57 degrees C (0 to 135 degrees F) Relative Humidity: 0 to 95% All measurements taken with the microphone mounted on a 76.2 cm x 76.2 cm (30 in. x 30 in.) wooden surface and with the sound source incident at 30 degrees with respect to the surface plane. Frequency Response 50 to 17,000 Hz Output Impedance (at 1000 Hz) 180 ohms actual (rated at 150 ohms) Open Circuit Sensitivity 1 kHz ref. 1 V per Pascal * Omnidirectional: -21.5 dB (81.4 mV) All settings -12 dB at 0 gain; *1 Pascal = 94 dB SPL Maximum Sound Pressure Level (1 kHz at 1% Total Harmonic Distortion, 1 k ohm load) Cardioid: 118.8 dB All settings +6 dB at 0 gain Signal to Noise Ratio (referenced at 94 dB SPL) Omnidirectional: 79.5 dB Equivalent Output Noise (A-weighted) Omnidirectional: 14.5 dB SPL Dynamic Range at 1 k ohm Load 96.2 dB 100 dB at 0 gain Common Mode Rejection 45 dB minimum, 10 Hz to 100 kHz Preamplifier Output Clipping Level -6 dBV (0.5 V) 12 dB at 0 gain Polarity Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of the preamplifier XLR output connector. Power Requirements 11 to 52 Vdc phantom 2.0 mA current consumption Flat frequency response across the vocal range for uncolored sound Sleek, low-profile design for unobtrusive appearance Interchangeable cardioid, supercardioid, and omnidirectional cartridges that provide optimal choice for each application Balanced, transformerless output for increased immunity to noise over long cable runs
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