Shure BLX24R/SM58-H11 Rack-Mount Wireless Vocal System

The Shure BLX24R/SM58-H11 is a single-channel UHF wireless vocal system built for live sound, presentations, houses of worship, and installed audio setups. It pairs the rack-mount BLX4R receiver with a BLX2 handheld transmitter using an integrated SM58 dynamic microphone capsule. The H11 version operates in the 572–596 MHz frequency band, so local spectrum authorization should be verified before use.

This system removes the cable between a vocalist or presenter and the sound system while retaining familiar handheld microphone operation. Its stated line-of-sight operating range is up to 300 feet, with actual range affected by RF interference, reflections, and obstructions. The BLX2 transmitter is powered by two AA batteries and offers up to 14 hours of alkaline battery life.

The integrated SM58 capsule is designed for vocal and speech use, with a cardioid pickup pattern that focuses on the intended source and helps reduce off-axis sound. Its tailored vocal response includes a brightened midrange and low-frequency rolloff to help manage close-mic bass buildup. A pneumatic shock mount and built-in pop filter further support practical handheld use.

The BLX4R receiver uses one-touch QuickScan frequency selection to help locate an available group and channel. Its LCD provides RF and audio metering, while the front-panel controls support group and channel selection. Adjustable output level and separate XLR mic-level and 1/4-inch instrument-level outputs make it straightforward to connect to a mixer, amplifier, or powered speaker system.

For permanent or portable production rigs, the BLX4R installs in a standard 19-inch equipment rack using the included hardware. Removable BNC antennas and supplied bulkhead adapters support flexible antenna placement at the front or rear of a rack. The system can be expanded to up to 12 compatible channels per frequency band, subject to regional conditions and the RF environment.

Key Features

• H11 UHF Band: Operates from 572 to 596 MHz; verify local spectrum authorization before use.
• SM58 Vocal Capsule: Cardioid dynamic capsule supports focused vocal and speech pickup.
• BLX4R Rack Receiver: Single-channel receiver fits standard 19-inch audio equipment racks.
• QuickScan Setup: One-touch scanning helps locate an available group and channel.
• 300-Foot Operating Range: Provides up to 300 feet of line-of-sight wireless range.
• Dual Audio Outputs: Includes XLR mic-level and 1/4-inch instrument-level receiver outputs.

Design & Installation

The BLX4R combines a molded ABS and steel enclosure with removable BNC antennas, a front-panel LCD, and adjustable output control. The BLX2 handheld transmitter uses a molded ABS housing and integrated SM58 capsule. The microphone section incorporates a steel-mesh grille, built-in pop filtering, and shock isolation intended to reduce handling noise.

Install the receiver in a standard 19-inch rack with the supplied brackets and hardware, then connect either the XLR mic output or 1/4-inch instrument output to the destination audio system. Connect the supplied power supply, attach the antennas, run a group scan, and set the BLX2 transmitter to the matching group and channel. Keep antennas visible and separated from major obstructions when practical for more reliable RF performance.