MX391, MX392, and MX393 Microflex Boundary Microphones

MX391, MX392 and MX393 Microflex® Wired Boundary Microphones from Shure are 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. Find out why we call the Microflex Boundary microphones "the smart choice" for just about every application. Take a listen today.

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The polar pattern of the cartridge is indicated by the model number suffix:

C = Cardioid, S = Supercardioid, O= Omnidirectional 

MX392: Surface-mount microphone; includes a programmable membrane on/off switch, LED logic input/switch logic output terminals, an on/off indicator LED, screw terminal connections, and attached unterminated cable.     

• MX392/C -- Cardioid, Black
• MX392/S  -- Supercardioid, Black
• MX392/O -- Omnidirectional, Black

MX393: Surface-mount microphone; includes a programmable membrane on/off switch, an on/off indicator LED, and a miniature, three pin connector.  Includes 12 foot XLR cable.  

• MX393/C -- Cardioid, Black
• MX393/S  -- Supercardioid, Black
• MX393/O -- Omnidirectional, Black

The MX391BP micrphones have been discontinued.

Low profile, professional boundary microphones with interchangeable cartridges for a wide variety of applications.

• 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 (MX392/MX393 models only)
• LED logic input and switch logic output terminals for remote control or use with automatic mixers (MX392 models only)

MX391

Spec Sheet (PDF)

Polar Pattern

Cardioid (MX391/C, MX391W/C)

Supercardioid (MX391/S, MX391W/S)

Omnidirectional (MX391/O, MX391W/O)

Environmental Requirements

Operating Temperature Range: -18 to 57 degrees C (0 to 135 degrees F)

Relative Humidity: 0 to 95%

Dimensions

See User Guide

 

PREAMPLIFIER SPECIFICATIONS MX391 ONLY

These specifications apply only to the MX391/MX391W microphones when used with the supplied preamplifier. All measurements taken with the microphone mounted on a 76.2 cm x 76.2 cm (30 in. x 30 in.) wooden surface and with the sound source incident at 30 degrees with respect to the surface plane.

 Frequency Response

50 to 17,000 Hz

 

Output Impedance (at 1000 Hz)

180 ohms actual (rated at 150 ohms)

 

Open Circuit Sensitivity 1 kHz ref. 1 V per Pascal *

Cardioid: -29.6 dB (33.5 mV)

Supercardioid: -28.3 dB (38.5 mV)

Omnidirectional: -21.5 dB (81.4 mV)

All settings -12 dB at 0 gain; *1 Pascal = 94 dB SPL

 

Maximum Sound Pressure Level (1 kHz at 1% Total Harmonic Distortion, 1 k ohm load)

Cardioid: 118.8 dB

Supercardioid: 117.5 dB

Omnidirectional: 110.7 dB

All settings +6 dB at 0 gain

 

Signal to Noise Ratio (referenced at 94 dB SPL)

Cardioid: 71.4 dB

Supercardioid: 72.7 dB

Omnidirectional: 79.5 dB

 

Equivalent Output Noise (A-weighted)

Cardioid: 22.6 dB SPL

Supercardioid: 21.3 dB SPL

Omnidirectional: 14.5 dB SPL

 

Dynamic Range at 1 k ohm Load

96.2 dB

100 dB at 0 gain

 

Common Mode Rejection

45 dB minimum, 10 Hz to 100 kHz

 

Preamplifier Output Clipping Level

-6 dBV (0.5 V)

12 dB at 0 gain

 

Polarity

Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of the preamplifier XLR output connector.

 

Power Requirements

11 to 52 Vdc phantom

2.0 mA current consumption

MX392 & MX 393

Spec Sheet (PDF)

All measurements taken with microphone mounted on a wooden surface 76.2 cm x 76.2 cm (30 in. x 30 in.).

 

Frequency Response

50 to 17,000 Hz

 

Polar Pattern

Cardioid (MX392/C, MX393/C)

Supercardioid (MX392/S, MX393/S)

Omnidirectional (MX392/O, MX393/O)

 

Output Impedance

EIA Rated at 150 ohms (180 ohms actual)

Sensitivity (at 1 kHz, open circuit voltage)

Cardioid Cartridge: -27.5 dBV/Pa (42.2 mV)

Supercardioid Cartridge: -26.5 dBV/Pa (47.3 mV)

Omnidirectional: -22.0 dBV/Pa (79.4 mV)

1 Pascal=94 dB SPL

 

Maximum Sound Pressure Level (1 kHz at 1% Total Harmonic Distortion, 1 k ohm load)

Cardioid: 117.0 dB

Supercardioid: 116.0 dB

Omnidirectional: 111.5 dB

 

Signal to Noise Ratio (referenced at 94 dB SPL)

Cardioid: 71.0 dB

Supercardioid: 72.0 dB

Omnidirectional: 76.5 dB

 

Equivalent Output Noise (A-weighted)

Cardioid: 23.0 dB SPL

Supercardioid: 22.0 dB SPL

Omnidirectional: 17.5 dB SPL

 

Dynamic Range

94.0 dB

 

Common Mode Rejection

45 dB minimum, 10 Hz to 100 kHz

 

Switch Attenuation

50 dB minimum

 

Preamplifier Output Clipping Level

-6 dBV (0.5 V)

 

Polarity

Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output connector.

 

Logic Connections (MX392 Only)

LED IN: Active low (<1.0v), TTL compatible. Absolute maximum voltage: -0.7V to 50V.

SWITCH OUT: Active low (<0.5V), sinks up to 20mA, TTL compatible. Absolute maximum voltage: -0.7V to 24V (up to 50V through 3 k ohms).

 

Power Requirements

11 to 52 Vdc phantom

2.0 mA current consumption

 

Environmental Requirements

Operating Temperature Range: -18 to 57 degrees C (0 to 135 degrees F)

Relative Humidity: 0 to 95%

 

Dimensions

See User Guide

• FAQ's for MX391, MX392, MX393
• CommShield Technology White Paper
• RF and GSM Resistance