Radial Engineering Relay XO Output Switcher – Remote-Controlled True-Bypass Signal Routing Interface

The Radial Engineering Relay XO Output Switcher is a compact, professional-grade remote-controlled true-bypass signal routing interface designed for precise A/B switching of balanced audio signals in live sound, broadcast, and studio environments.

At its core, the Relay XO allows a single mic or line-level input to be instantly routed between two separate XLR outputs, giving performers and engineers flexible control over where a signal is sent. This makes it ideal for applications such as switching a vocal mic between the main PA system and a monitor/communication feed, or toggling between two different processing chains without introducing noise or tone coloration.

Unlike simple mechanical switches, the Relay XO uses high-quality sealed relays and a completely passive signal path, ensuring the audio remains transparent, with no added gain, distortion, or frequency loss. Its true-bypass design guarantees that when a path is inactive, it is fully isolated, eliminating ground loop issues and unwanted signal bleed.

One of its key advantages is remote control capability, allowing switching to be operated via an optional footswitch or external contact closure. This enables performers to control signal routing discreetly during live performance without needing to interact directly with the unit.

Built for professional reliability, the Relay XO features a rugged steel chassis and high-spec components designed for touring, studio installs, and broadcast racks where consistent, silent switching is critical.

Key Features:

• 1-in / 2-out balanced mic or line-level signal routing
• Remote-controlled true-bypass A/B output switching
• Ultra-transparent passive signal path using sealed relay switching
• Ideal for switching between PA, monitor, or alternate audio feeds
• Compatible with footswitch or external contact closure control
• Rugged, tour-grade steel chassis construction
• Designed for live sound, broadcast, and studio signal management