The P100 is a 2-channel dual source power amplifier with automatic source switching. It features two audio line inputs with a loop out to another zone, receiver, or device for the primary input, allowing for easy system expansion. This amplifier can be used for power upgrades in specific zones with any audio system including Russound controllers and are perfect for adding local sources to a whole-home audio system. The automatic switching allows for the whole-house audio system to be the default audio source and whenever a local input source (like a Bluetooth player or an audio streamer) is active, it will automatically switch to that local source.