Automatic A/B Stereo RCA Switch with Level Detection

This automatic stereo line switch monitors left/right RCA inputs from two sources and selects whichever one is active based on signal level, so there’s no need for a manual switch. It’s useful for home or commercial audio systems that have more sources than available inputs, or for setups where the switching point isn’t easily reachable.

Built-in SPDT relay outputs mirror the A/B selection, letting the unit trigger external equipment or act as a standalone sound-activated relay. The housing is rugged metal with an adjustable tilt stand, and it includes detachable Phoenix-style connectors for the relay contacts along with an AC power adapter.

• LED status indicators for A and B channel selection
• SPDT relay output for triggering external devices
• Adjustable tilt stand: 0 to -25 degrees
• Stereo (left/right) RCA line input and output connections
• Detachable Phoenix-style relay contact connectors
• Rugged metal housing
• AC power adapter included
• Relay contacts rated 24VDC, 2A
• Dimensions (excluding connectors and mounting tabs): 1.25″ H x 5.5″ W x 2″ D

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