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Shure MX393/O Microflex Boundary Microphone

Shure MX393/O Microflex Boundary Microphone Shure Microflex MX300 Series microphones are surface-mounted electret condenser microphones designed primarily for mounting on conference tables, stage floors, and lecterns. Their high sensitivity and wide frequency range make them especially suitable for picking up speech and vocals in sound reinforcement and recording applications. Interchangeable cartridges provide the installer with greater flexibility and make it possible to easily reconfigure microphone coverage as the need arises. The MX392 and MX393 models include an internal pre amplifier.

MX300 Series microphones take advantage of the principle that, at a barrier or boundary, the sound pressure level doubles. When placed near a sufficiently large boundary surface, the microphone has 6 dB higher sensitivity and approximately 3 dB greater direct-to-reverberant sound ratio.

Shure MX393/O Features:

  • Condenser Boundary Microphone
  • Omnidirectional Polar Pattern
  • 12’ 3 Pin Mini Connector (TA3F) to XLR cable
  • Programmable switch and LED indicator
  • Built-In Preamp
  • Color: Black
  • Flat frequency response across the vocal range for uncolored sound
  • Sleek, low-profile design for unobtrusive appearance
  • Balanced, transformerless output for increased immunity to noise over long cable runs


  • Frequency Response: 50Hz to 17kHz
  • Polar Pattern: Omnidirectional
  • Output Impedance: 150 ohms
  • Sensitivity: -22.0 dBV/Pa
  • Maximum SPL: 111.5 dB
  • Signal to Noise Ratio: 76.5 dB
  • Dynamic Range: 94.0 dB
  • Power Requirements: 11 to 52 Vdc phantom; 2.0 mAcurrent consumption
  • Shipping Weight: 1.40 lbs