[mythtv-users] Audio amplifiers for myth systems

[Simon Hobson]

Eric Sharkey <eric at lisaneric.org> wrote:

> Some TV's also support "audio return channel" via HDMI.

Yes, I believe that is what you want to be looking for.
Otherwise, you need to route your HDMI sources (all of them) via the 5.1 system so it can pick out the sound. As long as you have ARC, the sound system will automagically get the sound for whatever source the TV is using.