Shure MX391 Microflex Boundary Microphone
MX391/C   

Microflex models from Shure, the smartest boundary microphones yet. 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.

Available in cardioid, supercardioid and omnidirectional polar patterns, the Microflex cartridges give you superior Shure quality sound for every application. In addition, their programmable switches offer the flexibility to be set for Push to Talk, Push to Mute or Push On/Push Off modes. Attractively designed with a low profile, professional appearance, the Microflex Boundary microphones come with an easy to use paint mask for your custom-color installations.

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
• Programmable on/off switch and LED on/off indicator
• Includes an attached 12 ft cable terminated with a 4-pin mini connector and a separate preamplifier. A rubber strain relief is provided for applications where you want to remove the 4-pin mini connector and connect the microphone cable directly to screw terminals in the preamplifier.

Specifications

• Frequency Response: 50 to 17,000 Hz
• Output Impedance (at 1000 Hz): 180 ohm
• Sensitivity: -29.6 dB
• Maximum SPL: 118.8 dB
• Equivalent Output Noise: 22.6 dB SPL
• Signal to Noise Ratio: 71.4 dB
• Dynamic Range: 96.2 dB
• Common Mode Rejection: 45.0 dB
• Preamp Output Clipping Level: -6.0 dBV
• Power Requirements: 11 to 52 Vdc phantom, 2.0 mA