The Shure MX393 is a professional cardioid boundary microphone designed for discreet, high-quality audio capture in conferencing, installed sound, and theatrical applications. Utilizing Pressure Zone Microphone (PZM) technology, it is engineered to be placed directly on a table, floor, wall, or other flat surface, where it leverages the boundary effect to produce a wide, hemispherical pickup area with exceptional clarity and reduced phase cancellation. The cardioid polar pattern within this boundary design provides focused front-side pickup while rejecting sound from the rear, making it ideal for capturing multiple speakers around a conference table or actors on a stage floor with minimal visual intrusion.

The microphone features a low-profile, rectangular housing that minimizes sight lines, allowing it to blend seamlessly into the environment. It operates on standard 11-52V phantom power and provides a balanced output via an attached cable terminating in a 3-pin XLR connector. The MX393 is built for durability, with a robust casing that protects the condenser element from physical damage and environmental factors. Its frequency response is tailored for speech intelligibility, ensuring that voices are captured naturally and clearly, even when the microphone is placed at a distance from the speaker or in acoustically challenging rooms.

Common applications include boardroom conferencing, courtroom recording, distance learning classrooms, stage floor pick-up for theatrical productions, and houses of worship. The MX393 simplifies system design by covering a wide area with a single microphone, reducing the number of microphones and cables needed. When integrated into a well-designed audio system, it delivers reliable, consistent performance, making it a trusted tool for audio engineers and installers who require a discreet yet powerful solution for capturing group audio in fixed installations.