Shure Microflex MX391 Series microphones are small, surface-mounted electret condenser microphones designed 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.
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.
MX391: Includes attached 12 ft (4 m) cable terminated with a 4-pin mini connector and separate preamplifier. A rubber strain relief is provided for applications that require removing the 4-pin mini connector and connecting the mic cable directly to screw terminals in the preamplifier.
| Polar Pattern | Cardioid, Supercardioid, Omnidirectional |
|---|---|
| Environmental Requirements | Operating Temperature Range: -18 to 57 degrees C; Relative Humidity: 0 to 95% |
| Frequency Response | 50 to 17,000 Hz |
| Output Impedance (at 1000 Hz) | 180 ohms actual (rated at 150 ohms) |
| 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) |
| 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 |
| Pickup Angle | |
| Cardioid | (–3 dB) = 130 ° |
| Supercardioid | (–3 dB) = 115 ° |
| Omnidirectional | = 360 ° |
| 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 |
| 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 |
| 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) |
| Dimensions (H x W x D) | 2.09" (5.3 cm) x 3.13" (7.9 cm) x 0.75" (1.9 cm) |
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
