Radial Engineering SW4 4-Channel Audio Switcher – Multi-Source Automatic Backup and Signal Routing Interface for Live and Studio Applications

The Radial Engineering SW4 4-Channel Audio Switcher is a professional multi-source automatic backup and signal routing interface designed for live sound, broadcast, and studio environments where reliable stereo source switching is essential.

Built to handle mission-critical playback situations, the SW4 allows up to four stereo or multi-channel sources to be connected and continuously monitored. It automatically switches between inputs if a primary source fails, drops out, or becomes unstable, ensuring uninterrupted audio delivery during live performances or automated playback systems.

The unit supports balanced stereo AB input switching across 4 channels, making it ideal for managing multiple playback devices such as laptops, media players, or audio interfaces. It can route signals to a single output or configured destinations, maintaining phase coherence and signal integrity throughout the switching process.

A key feature of the SW4 is its summed output capability, allowing multiple inputs to be combined when needed for monitoring or redundancy workflows. It also includes PFL (Pre-Fade Listen) monitoring, giving engineers the ability to audition any input source before it is sent to the main output—an essential function for live sound troubleshooting and show control.

As with other Radial switching systems, the SW4 uses high-quality electronic design to ensure transparent signal paths, low noise operation, and silent switching, preventing pops, clicks, or artifacts during transitions.

Key Features:

• 4-channel automatic audio switcher for stereo or multi-source routing
• Supports multiple AB input sources with automatic failover detection
• Balanced signal switching for professional audio systems
• Summed output option for flexible routing and monitoring setups
• Built-in PFL (Pre-Fade Listen) for source auditioning
• Ultra-transparent switching with no audible artifacts
• Designed for live performance, broadcast, and studio applications