Originally Posted by mrmarbach
From all of this, I hope we can safely assume that the HD621 can already handle a 7.1 PCM signal from the HDMI input? (I mean, the hardware/DSP is sufficient, even if the firmware may need tweaking.)
Yes. It has 4xS/PDIF out so it is clear that discrete 7.1 is designed in.

561, DSP5500s, DSP5000C, analog sides and rears