Shure MX391/S Microflex Boundary Microphone

Equipped with features like programmable, silent membrane switches, logic inputs and outputs, and LED indicators, 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.

MX391: Includes 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.

Shure MX391/S Features

• Flat frequency response across the vocal range for uncolored sound
• Interchangeable cardioid, supercardioid, and omnidirectional cartridges that provide optimal choice for each application
• Sleek, low-profile design for unobtrusive appearance
• Balanced, transformerless output for increased immunity to noise over long cable runs

• MX391/S Microflex boundary microphone1
• 12 ft cable with 4-pin mini connector and in-line preamp1
• Rubber strain relief1

• Transducer TypeCondenser
• Polar PatternSupercardioid
• Frequency Response50 Hz - 17 kHz
• Rated Output Impedance150 ohms (180 ohms actual)
• Sensitivity-28.3 dB (38.5 mV)
• Max. SPL (1 kHz at 1% THD, 1 kΩ load; All settings +6 dB at 0 gain (internal modification))110.7 dB
• Equivalent Output Noise (A-weighted)21.3 dB SPL
• Signal-to-Noise Ratio (referenced at 94 dB SPL at 1kHz)79.5 dB SPL
• Dynamic Range (1kΩ load at 1kHz)96.2 dB
• Preamp Output Clipping Level (1% THD)-6dBV (0.5V)
• Power Requirements11-52 VDC phantom, 2.0mA