Radio Design Labs ST-UMX3 Universal Audio Mixer

Product Description

The RADIO DESIGN LABS ST-UMX3 is a universal audio mixer designed for three microphone inputs. It combines multiple mic-level signals into a single mixed output, making it a practical solution for installations that require basic microphone summing without a full-scale mixing console. The ST-UMX3 is suited for integration into permanent or semi-permanent audio systems where compact, reliable signal mixing is required. Installation is typically handled by low-voltage systems technicians or audio-visual integrators working in commercial or institutional environments.

The ST-UMX3 fits applications where three microphone sources need to be combined into one feed, such as conference rooms, broadcast setups, paging systems, or distributed audio installations. It is designed to accept standard mic-level signals and deliver a summed output compatible with downstream audio equipment including amplifiers, processors, and recording interfaces. Its universal input design supports a range of microphone types commonly found in professional AV environments.

Key Features

• Accepts three microphone-level input signals for summing into a single output
• Universal input design compatible with standard mic-level sources
• Compact form factor suited for rack, wall, or equipment-bay integration
• Designed for permanent installation in commercial and institutional AV systems

Compatibility

Designed as an OEM-style replacement or direct-install unit for three-input microphone mixing applications in professional audio and AV signal distribution systems.

Installation Notes

Installation of the ST-UMX3 is typically performed by licensed low-voltage or AV systems technicians. Power down all connected audio equipment before making signal connections to avoid noise or damage to downstream components. Follow applicable low-voltage wiring codes and the facility's AV system documentation when routing mic cables. Do not exceed the rated input signal levels for the connected microphone sources.