Shure MX393 Microflex Boundary

The MX393 is a surface-mount condenser boundary microphone designed for boardrooms, altars, and conference room tables. It features a silent programmable membrane switch, interchangeable cartridge, Logic input/output, LED indicators, and a miniature three-pin connector. The microphone is available with cardioid, supercardioid, or omnidirectional cartridges.

The Shure MX393 Boundary Microphone is available supercardioid or omnidirectional.

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 membrane on/off switch plus LED on/off indicator
• 12' TA3F to XLRM Cable

Specifications:

• Type: Electret Condenser
• Frequency Response: 50–17000 Hz
• Polar Pattern: Omnidirectional
• Output Impedance: 180 Ω
• Output Configuration: Active Balanced
• Sensitivity @ 1 kHz, open circuit voltage: –22 dBV/Pa, 1 Pa=94 dB SPL
• Maximum SPL, 1 kHz at 1% THD, 1 kΩ load: 111 dB
• Self Noise, A-weighted: 15 dB SPL
• Signal-to-Noise Ratio, Ref. 94 dB SPL at 1 kHz: 80 dB
• Dynamic Range, 1 kΩ load, @ 1 kHz: 96 dB
• Common Mode Rejection, 10 Hz to 100 kHz: 45 dB, minimum
• Clipping Level at 1% THD: –6 dBV (0.5 V)
• Polarity: Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output XLR connector
• Mute Switch: 50–20000 Hz, –50 dB minimum
• Logic Connections:
  • LED IN: Active low (≤1.0V), TTL compatible. Absolute maximum voltage: -0.7V to 50V.
  • LOGIC-OUT: Active low (≤0.5V), sinks up to 20mA, TTL compatible. Absolute maximum voltage: -0.7V to 24V (up to 50V through 3kΩ).
• Cable: 3½ m (12 ft) detachable cable with 3-pin audio connector
• Weight: 172 g (0.38 lbs)
• Environmental Conditions:
  • Operating Temperature: -18-57 °C(0-135 °F)
  • Storage Temperature: -29-74 °C(-20-165 °F)
  • Relative Humidity: 0-95%
• Power Requirements: 11-52V DC , 2.0 mA