This unit has been used for 5+ years on light touring and corporate activations and remains in good working condition.

The Radial SW4 is a professional 4‑channel balanced audio switcher designed to connect multiple balanced sources (such as mixing consoles or wireless systems) and provide fast, seamless A/B switching with transformer‑isolated outputs. Each channel has dual XLR inputs and can be linked for stereo, tri‑channel, or quad switching — ideal for live events, festivals, and broadcast setups where console or source changes need to be smooth and noise‑free.