Shure Brothers MX391/O Boundary Microphone Omnidirectional

Product Description

The SHURE BROTHERS INC MX391/O is a miniature boundary microphone with an omnidirectional pickup pattern, designed for professional audio capture in fixed-installation environments. Boundary microphones work by mounting flush against a flat reflective surface, which combines the direct and reflected sound paths to deliver a clear, phase-coherent signal. The omnidirectional polar pattern picks up sound equally from all directions, making it well suited for conference rooms, courtrooms, houses of worship, and similar spaces where multiple speakers are present at varying positions around the mic.

This unit is intended for permanent or semi-permanent installation on tabletops, podiums, walls, or floors. It is commonly specified by audio-visual integrators, sound contractors, and installed-sound technicians. The small form factor minimizes visual intrusion while maintaining consistent audio coverage across a defined area. It ships as a single unit per order.

Key Features

• Omnidirectional pickup pattern captures audio from all directions evenly
• Miniature boundary design mounts flat against a surface for low-profile installation
• Phase-coherent boundary layer operation reduces comb filtering artifacts
• Suited for fixed installations in conference, worship, and presentation environments
• Compact footprint minimizes visual impact on the installation surface

Compatibility

Designed as an OEM-style boundary microphone for use with professional installed-sound systems, mixing consoles, and audio-visual signal chains that accept a standard low-impedance microphone input.

Installation Notes

Installation is typically performed by a licensed audio-visual integrator or sound contractor. The microphone should be mounted on a clean, rigid, flat surface using the appropriate hardware for the substrate material. Ensure phantom power requirements are confirmed with the connected preamplifier or mixer before powering the system. Route cabling in compliance with applicable local building and low-voltage wiring codes.