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MICROPHONE SPECIFICATIONS
Polar Pattern (Figure 6)
Cardioid (MX391/C, MX391W/C)
Supercardioid (MX391/S, MX391W/S)
Omnidirectional (MX391/O, MX391W/O)
Environmental Requirements
Operating Temperature Range:
Relative Humidity: 0 to 95%
Dimensions
See Figure 3.
Wiring Diagram
| SHIELD = |
| Connector housing |
3 | PINS 3 and 4= BLACK |
1 | LEAD (jumped) |
|
4
2 | PIN 2 = RED LEAD |
|
FIGURE 2
PREAMPLIFIER SPECIFICATIONS:
MX391 AND 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.) wood- en surface and with the sound source incident at 30° with respect to the surface plane.
Frequency Response (Figure 5)
50 to 17,000 Hz
Output Impedance (at 1000 Hz)
180Ω actual (rated at 150Ω)
Open Circuit Sensitivity
Cartridge Type | 1 kHz ref. 1 V per Pascal * |
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Cardioid | |
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Supercardioid | |
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Omnidirectional | |
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All settings
Maximum Sound Pressure Level
(1 kHz at 1% Total Harmonic Distortion, 1 kΩ 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
Cardioid: 22.6 dB SPL
Supercardioid: 21.3 dB SPL
Omnidirectional: 14.5 dB SPL
Dynamic Range at 1 kΩ Load
96.2 dB
100 dB at 0 gain
Common Mode Rejection
45 dB minimum, 10 Hz to 100 kHz
Preamplifier Output Clipping Level
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
2.0mA current consumption
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.
FURNISHED ACCESSORIES
Zipper Bag | 95A2313 |
RK100PK | |
Hex Wrench #4 (MX391 & MX391 W) | 80A67 |
REPLACEMENT PARTS
Omnidirectional Cartridge | R183B |
Supercardioid Cartridge | R184B |
Cardioid Cartridge | R185B |
RK100PK | |
RK100PKW |
NOTE: For technical data by Fax, phone
SHURE, the Shure logo, and MICROFLEX are registered trademarks of Shure Incorporated.
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