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The Shure MX391 Series are small, surface-mounted electret condenser microphones designed for sound reinforcement and recording applications. These microphones are suitable for mounting on conference tables, stage floors, and lecterns, offering high sensitivity and a wide frequency range for picking up speech and vocals.
The MX391 microphones are designed to capture audio with a flat frequency response across the vocal range, ensuring uncolored sound reproduction. A key feature is the use of interchangeable cartridges, which allows users to select the appropriate polar pattern for different applications. This adaptability makes the MX391 series versatile for various acoustic environments and specific pickup requirements. The microphones also feature a sleek, low-profile design, contributing to an unobtrusive appearance in professional settings. Additionally, they incorporate RF filtering to minimize interference and ensure clear audio capture.
The MX391 microphones are available in black or white finishes. The specific polar pattern of the included cartridge is indicated by a suffix in the model number:
All measurements for the MX391 series are taken with the microphone mounted on a wooden surface measuring 76 x 76 cm.
Type: Electret Condenser
Frequency Response: 50–17000 Hz
Polar Patterns (Cartridge Dependent):
Output Impedance: 180 Ω
Output Configuration: Active Balanced
Sensitivity (@ 1 kHz, open circuit voltage):
Maximum SPL (1 kHz at 1% THD, 1 kΩ load):
Self Noise (A-weighted):
Signal-to-Noise Ratio (Ref. 94 dB SPL at 1 kHz):
Dynamic Range (1 kΩ load, @ 1 kHz): 96 dB
Common Mode Rejection: 45 dB, minimum
Clipping Level (at 1% THD): -6 dBV (0.5 V)
Polarity: Positive sound pressure on the diaphragm produces positive voltage on pin 2 relative to pin 3 of the output XLR connector.
Environmental Conditions:
Power Requirements: 11–52 V DC, 2.0 mA
Microphone Placement: For optimal low-frequency response and rejection of background noise, the microphone should be placed on a large, flat surface such as a floor, table, or lectern. To minimize reverberance, it is recommended to avoid reflective surfaces directly above or to the sides of the microphone, such as beveled sides of pulpits or overhanging shelves.
Interchangeable Cartridges: The Microflex microphones utilize interchangeable cartridges, allowing users to easily change the polar pattern to suit different installation requirements or acoustic environments. This flexibility ensures that the microphone can be optimized for various pickup scenarios.
Preamp Gain: If necessary, the preamplifier gain can be reduced by 12 dB. This adjustment should be performed by an authorized Shure service center.
RFI Filtering: To ensure optimal RF immunity, it is crucial that MX391 microphones are used with the RK100PK or RK202PK plate-mounted preamps.
Permanent Installation:
Cable Handling: Users should not attempt to detach the cable from the microphone, as this may result in damage to the unit.
Cleaning: While the manual notes that yellowing of plastic material can be caused by cigarette smoke, ultraviolet rays, and other chemical interactions, it also states that there is typically no cleaning method that will restore the original whiteness once plastic has yellowed.
Each MX391 microphone comes with the following accessories:
The Shure MX391 series meets the essential requirements of all applicable European Directives and is eligible for CE marking. The CE Declaration of Conformity can be obtained from Shure Incorporated or any of its European representatives, or by visiting www.shure.com/europe/compliance.
General| Brand | Shure |
|---|---|
| Model | MX391 |
| Category | Microphone |
| Language | English |
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