[TMadMac]

I'm unclear exactly what your problem is - is that that HD passthru isn't working, or that it's working and the volume is too low? If the former, what constitutes not working? What are your Audio Output settings? Take a screenshot (CTRL-S) and post them. There's no known issues with the ChromeBox and HD audio output, with the exception of receives that don't correctly advertise their capabilities via EDID (mostly Pioneer IIRC).

That's the first assumption : HD audio are pass through but volume level is really low. Usually, I sets up a level of -30db but with HD audio I must go up to 0 or +5db just to ear something.

As you point some EDID potential problems, I will look further in that direction. I will try to find some other receiver to test with.

Just to be sure, I will post a log and settings : I might be lucky and something would find my error.

Thanks for the tips about EDID.