Abstract: In one embodiment, an A/V interconnection architecture is provided that includes a TX A/V endpoint that supports native audio and stereo down-mixed audio on separate networks. The TX A/V endpoint outputs native audio over a video network to an RX A/V endpoint coupled to an A/V sink component that is capable of processing or outputting the native audio, and produces a stereo down-mixed version of the native audio which is output over an audio network to an audio system coupled to an audio sink component that is incapable of handling the native audio. In another embodiment, an A/V interconnection architecture is provide that enables expandable surround sound. If the number of audio channels for a type of surround sound is less than or equal to a number of local amplified output channels, surround sound is provided using only local unpowered speakers.