What's the forward audio bandwidth of hdmi? I can only find information about the bandwidth for ARC and eARC. But that's the Audio Return Channel, and it seems to me that it's not in use if you have a AVR. If one has a video/audo source that feeds an AVR, then it's the audio signal that travel with the video that matters. The audio is pulled out by the AVR, and the video goes on to the display.