Shure MX391/O

Overview

The Shure MX391/O is a boundary microphone designed to capture clear and natural speech in environments such as meeting rooms, lecture halls, and houses of worship. Featuring an omnidirectional condenser capsule, it picks up voices evenly from all directions, ensuring consistent audio levels without requiring speakers to lean toward the microphone. Its low-profile design keeps it discreet on desks or podiums, staying out of camera views during video calls or presentations.

Key features

• Omnidirectional condenser capsule that captures voices from all directions with consistent clarity
• Low-profile housing that minimizes visual distraction in live or video settings
• Interchangeable capsules allow switching between omnidirectional, cardioid, and supercardioid patterns to adapt to changing room acoustics or seating arrangements
• Inline preamplifier and balanced XLR output provide easy integration with professional audio equipment such as mixers and DSP processors
• Operates on standard phantom power (11 to 52 volts), eliminating the need for external power adapters
• Frequency response tailored from 50 Hz to 17 kHz to enhance natural speech intelligibility

Key specs

• Microphone type: Boundary condenser
• Polar pattern: Omnidirectional (interchangeable with cardioid and supercardioid capsules)
• Frequency response: 50 Hz to 17 kHz
• Power requirements: 11 to 52 V phantom power
• Output connector: Balanced XLR
• Housing color: Black

Connectivity and compatibility

The microphone’s balanced XLR output ensures compatibility with a wide range of professional audio systems, including mixers, digital signal processors, and public address setups. Its phantom power operation means it can be powered directly from most professional audio interfaces without additional adapters, simplifying installation and reducing cable clutter.

Ideal uses and environments

This microphone is well suited to boardrooms, council chambers, classrooms, and worship spaces where clear speech capture is essential. Its omnidirectional pickup pattern works effectively in conference tables or podiums where multiple speakers may be present. The low-profile design helps maintain a clean visual environment, making it a strong choice for video conferencing and live presentations where camera sight lines matter.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

Learn more

Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

Learn more

We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

Learn more