RDL ST-UMX3 Stick-On Audio Mixer

Capture and control audio for security and AV systems with the Radio Design Labs ST-UMX3 Stick-On audio mixer. This compact pro audio mixer is engineered to combine up to three mic- or line-level sources into a single, clean output—making it ideal for surveillance, monitoring, paging and conference integrations where space and reliability matter. Each of the three channels features its own preamplifier, a MIC/LINE selector and an audio-taper gain control so you can mix mixed-level, balanced or unbalanced signals without coupling or crosstalk. The summed output is driven through an active amplifier with an RDL dual-LED VU meter, giving installers a clear visual reference while setting levels. With wide frequency response and 24V DC low-voltage power compatibility, the ST-UMX3 easily ties into existing security power systems and IT rack environments. Backed by a 3-year limited warranty, this stick-on mixer delivers dependable performance for integrators specifying reliable audio in surveillance, monitoring and public-safety AV projects. Add the ST-UMX3 to your next security or AV installation to simplify audio routing and level control.

• Discreet stick-on form factor for fast, low-profile installation in racks, enclosures or behind panels
• Combine up to three mic or line sources to a single output while preserving clarity and isolation
• Per-input MIC/LINE switches and individual gain controls simplify integration with mixed-level systems
• Built-in dual-LED VU meter provides visual level monitoring for quick setup and reliable operation
• Robust isolated preamps minimize crosstalk—ideal for security, surveillance and paging audio paths
• 24V DC operation fits low-voltage security/AV power schemes for streamlined system deployment