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Shure MX391/O Omnidirectional Mini Black Condenser Boundary Microphone

Shure MX391/O Omnidirectional Miniature Black Condenser Boundary Microphone

SKU #: MX391/O
$252.00
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Expected June 30, 2025

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Boundary microphone provides high-quality sound for a wide range of applications due to its interchangeable condenser cartridge. It features LED indicators, and a low-profile design. Work a room in more ways than ever with Shure Microflex microphones. Combining sleek, low profile aesthetics and a complete selection of microphones and mounting options, the Microflex line offers the highest standard of quality and efficiency for installed audio applications.

Equipped with features like programable, 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. The MX391 includes attached 4 meter (12 ft) 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.

Shure MX391/O Omnidirectional Boundary Microphone Features:

  • 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.

Shure MX391/O Product Specifications:
Type:
Electret Condenser

Frequency Response:
50-17000 Hz

Polar Pattern:
Omnidirectional

Output Impedance:
180 Ω

Output Configuration:
Active Balanced

Sensitivity (@ 1 kHz, open circuit voltage):
-22 dBV/Pa(81.4 mV)
1 Pa=94 dB SPL

Maximum SPL (1 kHz at 1% THD, 1 kΩ load):
111 dB

Self Noise (A-weighted):
15 dB SPL

Signal-to-Noise Ratio (Ref. 94 dB SPL at 1 kHz):
80 dB

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 diaphragm produces positive voltage on pin 2 relative to pin 3 of output XLR connector

Operating Temperature:
-18-57°C (0-135°F)

Storage Temperature:
-29-74°C (-20-165°F)

Relative Humidity:
0-95%

Power Requirements:
11-52 V DC, 2.0

Each MX391/O Retail Box Includes:
(1) Shure MX391/O Omnidirectional Miniature Black Condenser Boundary Microphone
(1) Carrying/Storage Bag
(1) RFI Resistant, Inline Preamp for all MX Models (Black)
(1) Allen wrench (No. 4)
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