Microflex Boundary Microphones

The Shure Microflex Microphone Series MX 392 and MX393 Microflex® Wired Boundary Microphones from Shure are equipped with features like programmable, silent membrane switches, logic inputs and outputs, and green LED indicators. The high-quality solution for a range of applications such as altars, boardrooms and distance learning centers, Microflex Boundary microphones feature interchangeable condenser cartridges.

MX-392: Surface-mount mic; LED logic input/switch logic output terminals, screw terminal connections, attached unterminated cable MX393: Surface-mount mic; miniature three pin connector, 12' XLR cable

→ Flat frequency response across the vocal range for uncolored sound
→ Interchangeable cardioid, supercardioid, and omnidirectional cartridges that provide choices for applications
→ Sleek, low-profile design for unobtrusive appearance

Frequency Response	50 to 17,000 Hz
Polar Pattern	Cardioid (MX392/C, MX393/C); Supercardioid (MX392/S, MX393/S); Omnidirectional (MX392/O, MX393/O)
Output Impedance	EIA Rated at 150 O (180 O actual)
Sensitivity (at 1 kHz, open circuit voltage)	Cardioid Cartridge= –27.5 dBV/Pa (42.2 mV); Supercardioid Cartridge= –26.5 dBV/Pa (47.3 mV); Omnidirectional= –22.0 dBV/Pa (79.4 mV); 1 Pascal=94 dB SPL
Maximum Sound Pressure Level (1 kHz at 1% Total Harmonic Distortion, 1 kO load)	Cardioid= 117.0 dB; Supercardioid= 116.0 dB; Omnidirectional= 111.5 dB
Signal to Noise Ratio (referenced at 94 dB SPL)	Cardioid= 71.0 dB; Supercardioid= 72.0 dB; Omnidirectional= 76.5 dB
Equivalent Output Noise (A-weighted)	Cardioid= 23.0 dB; Supercardioid= 22.0 dB; Omnidirectional= 17.5 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 (v1.0v), TTL compatible. Absolute maximum; voltage= -0.7V to 50V.; SWITCH OUT= Active low (v0.5V), sinks up to 20mA, TTL compatible. Absolute maximum voltage: -0.7V to 24V (up to 50V through 3kO)
Power Requirements	11 to 52 Vdc phantom; 2.0 mA current consumption
Environmental Requirements	Operating Temperature Range= –18° C to 57° C (0° F to 135° F); Relative Humidity= 0 to 95%