Speakercraft's manual and electronic A-B Switches allow you to switch between line level (RCA) or speaker level (wire) audio sources.

The in-wall model, Speakercraft AB-S, is bi-directional and allows you to either switch one amplifier input to two pairs of speakers or switch two amplifier inputs to one pair of speakers.

The automatic electronic model, Speakercraft LL-One, automatically senses and switches audio line level (RCA) sources.

The automatic electronic model, Speakercraft SL-One, automatically senses and switches speaker level (speaker wire) sources.