Shure MX391/O Omni-Directional Boundary Condenser Microphone

Shure MX391/O Omni-Directional Boundary Condenser Microphone

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The black MX391 from Shure is a small, surface-mounted electret condenser microphone. It is designed to be mounted on conference tables, stage floors, and lecterns. Its high sensitivity and wide frequency range make it especially suitable for picking up speech and vocals in sound reinforcement and recording applications.

Flat frequency response across the vocal range for uncolored sound
Interchangeable cartridges provide a choice of polar pattern for each application
Sleek, low-profile design for unobtrusive appearance
Balanced, transformerless output for increased immunity to noise over long cable runs
RF filtering

Shure MX391/O Specifications:
  • Transducer Electret Condenser
  • Polar Pattern Omnidirectional
  • Frequency Range 50 Hz to 17 kHz
  • Signal to Noise Ratio 79.5 dB 
  • Equivalent Noise Level 14.5 dB A-Weighted
  • Maximum SPL 110.7 dB SPL 1%
  • Impedance 150 ohms
  • Sensitivity 81.4 mV/PA
  • Power Requirements 11-52 V
  • Output Connectors 3-pin XLR
  • Cable Length 12'
  • Operating Relative Humidity 0 to 95%
  • Operating Temperature 0 to 135°F (-17.78 to 57.22°C)
  • Storage Temperature -20 to 165°F (-28 to 73.89°C)
  • Operating Current Consumption 2 mA
  • Dynamic Range 96.2 dB

  • Length 3.126" (7.94 cm)

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