SUPERCARDIOD-Miniature Black Mic Condenser Boundary

Ideal Use Cases

The Shure MX391/S is a miniature black condenser boundary microphone identified for conference-room solutions. Its supercardioid configuration makes it a specific choice for installations that require that pickup pattern rather than a general-purpose microphone with an unspecified pattern. As part of the Shure Microflex series, this model is intended for buyers building or updating a boundary-microphone system and seeking a compact microphone supplied with the cabling and preamplifier components described for the MX391.

The attached 4 meter (12 foot) cable provides a defined connection length for planning conference-room placement. This known cable length is especially useful when determining the relationship between the microphone position, cable route, and preamplifier location before installation begins.

Why Choose This Model

The MX391/S combines a miniature boundary format, black color, condenser design, and supercardioid pickup designation in one clearly identified Microflex model. It includes an attached cable terminated with a 4-pin mini connector and uses a separate preamplifier. These details allow system designers and installers to evaluate the complete signal path instead of selecting a microphone without knowing how its cable is terminated or whether a preamplifier is supplied.

This model also accommodates an alternate connection method. A provided rubber strain relief supports applications in which the 4-pin mini connector is removed and the microphone cable is connected directly to screw terminals in the preamplifier.

Installation and Integration

In its supplied configuration, the microphone’s attached 4 meter (12 foot) cable terminates in a 4-pin mini connector for connection with the separate preamplifier. Installers should account for the full cable route and the placement of the separate preamplifier when preparing the conference-room installation.

For applications requiring direct cable termination, the 4-pin mini connector can be removed and the microphone cable connected to the preamplifier’s screw terminals. The included rubber strain relief is provided specifically for this installation approach. This gives the installer two documented integration paths: retaining the factory-installed mini connector or preparing the cable for a direct screw-terminal connection.

Because removing the connector changes the supplied cable termination, the appropriate connection method should be selected before permanent installation. The source information does not provide mounting dimensions, electrical requirements, or operating-environment limits, so those details should be confirmed separately when they are necessary for a project specification.

Performance Highlights

The central performance identifiers supplied for the MX391/S are its condenser design and supercardioid pickup pattern. It is categorized as a boundary microphone and associated with conference-room use. Its miniature format and black color define the physical variant, while the attached cable, specified connector, and separate preamplifier define its integration arrangement.

No frequency response, sensitivity, maximum sound-pressure level, impedance, or self-noise figures are included in the provided product data. Buyers requiring those measurements should verify them before comparing this model with alternatives.

What Makes It Different

The MX391/S is distinguished within the supplied information by the combination of a miniature black boundary-microphone body, condenser operation, and a supercardioid designation. The included connection system is equally important: an attached 4 meter cable, a 4-pin mini connector, and a separate preamplifier are all identified as part of the MX391 configuration.

The provision for direct screw-terminal installation adds another concrete differentiator. Rather than limiting installation to the attached mini connector, the documented arrangement permits connector removal and direct cable connection to the preamplifier. The supplied rubber strain relief supports that specific configuration.

Final Assessment

The Shure MX391/S is a focused choice for a conference-room boundary-microphone installation requiring a miniature black condenser model with a supercardioid pattern. Its supplied 4 meter (12 foot) cable, 4-pin mini connector, separate preamplifier, and rubber strain relief provide clearly defined components for integration planning.

Select this model when those microphone and connection characteristics match the project. For installations dependent on exact acoustic measurements, power requirements, dimensions, mounting provisions, or environmental ratings, confirm those specifications separately because they are not included in the available source data.