RDL ST-SX4 4-Input Audio Switcher

Streamline audio routing for monitoring, surveillance and AV systems with the Radio Design Labs ST-SX4 Pro Audio Mixer. Designed to accept up to four unbalanced audio sources, the ST-SX4 lets you select any single source (or switch all off) via a single CTRL input — reducing wiring complexity and simplifying remote audio selection for security and broadcast applications. The module provides unbalanced output and a wide frequency response (15 Hz–40 kHz) to preserve audio clarity across voice, program and line-level signals. Solid-state switching improves reliability and minimizes click/pop artifacts, while the supplied external resistors and compatibility with the D SERIES-RC4ST remote control enable fast, predictable integration. For installations that require stereo operation, the ST-SX4 includes slave capability for seamless expansion. Ideal for surveillance rooms, monitoring stations, conference and AV control racks, the ST-SX4 delivers dependable, compact audio switching where uptime and simplicity matter. Add the RDL ST-SX4 to your system for efficient remote audio selection — contact your supplier or order today to upgrade your monitoring or security audio workflow.

• Simplify system control with remote selection of any of four unbalanced audio sources for fast audio routing in monitoring and surveillance setups
• Single control-pair interface reduces wiring and integration time for security, AV and broadcast installations
• Solid-state switching delivers reliable, maintenance-free operation and clean switching across a 15 Hz–40 kHz frequency range
• Includes external resistors and supports remote control via D SERIES-RC4ST for turnkey installation
• Slave capability allows easy expansion to stereo switching or multi-channel configurations for flexible pro audio mixer setups