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.
Features
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Interchangeable cardioid, supercardioid, and omnidirectional cartridges that provide choices for applications
- Sleek, low-profile design for unobtrusive appearance
- Programmable membrane on/off switch,
- Logic input/ output terminals
- On/off indicator LED
- Screw terminal connections
- Attached unterminated cable Surface-mount microphone
Specifications
All measurements taken with microphone mounted on a wooden surface 76.2 cm x 76.2 cm (30 in. x 30 in.).
Frequency Response
Polar Pattern
Output Impedance
- EIA Rated at 150 Ω (180 Ω actual)
Sensitivity (at 1 kHz, open circuit voltage)
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Cardioid Cartridge: –27.5 dBV/Pa (42.2 mV)
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Supercardioid Cartridge: –26.5 dBV/Pa (47.3 mV)
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Omnidirectional: –22.0 dBV/Pa (79.4 mV)
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1 Pascal=94 dB SPL
Maximum Sound Pressure Level
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1 kΩ load)
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Cardioid: 117.0 dB
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Supercardioid: 116.0 dB
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Omnidirectional: 111.5 dB
Signal to Noise Ratio (referenced at 94 dB SPL)
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Cardioid: 71.0 dB
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Supercardioid: 72.0 dB
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Omnidirectional: 76.5 dB
Equivalent Output Noise (A-weighted)
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Cardioid: 23.0 dB
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Supercardioid: 22.0 dB
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Omnidirectional: 17.5 dB
Dynamic Range
Common Mode Rejection
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45 dB minimum, 10 Hz to 100 kHz
Switch Attenuation
Preamplifier Output Clipping Level
Polarity
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Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output connector.
Logic Connections (MX392 Only)
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LED IN: Active low (v1.0v), TTL compatible. Absolute maximum voltage: -0.7V to 50V.
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SWITCH OUT: Active low (v0.5V), sinks up to 20mA, TTL compatible. Absolute maximum voltage: -0.7V to 24V (up to 50V through 3kΩ).
Power Requirements
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11 to 52 Vdc phantom
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2.0 mA current consumption
Environmental Requirements
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Operating Temperature Range: –18° C to 57° C (0° F to 135° F)
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Relative Humidity: 0 to 95%
Dimensions
- 108.3 mm (L), 21.16 mm (H), 76.2 mm (W)
Certification
- Eligible to bear CE Marking. Conforms to European EMC Directive 89/336/EEC. Meets applicable tests and performance criteria in European Standard EN55103 (1996) parts 1 and 2, for residential (E1) and light industrial (E2) environments.
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