oh sorry. there is a whole thread about it over @ avs >> (wrong thread)
here is the issue btwn the onkyo receiver and the directv dvr:
... there is a compatibility issue between the two that makes the Onkyo receiver output silence for 3 to 5 seconds after using the DVR's trickplay controls. That just isn't acceptable to me. It is easy to say that the DVR is at fault, except that no other receiver has this issue with the HR20.
a few posts in this thread
this thread seem to question whether the 605 truly handles 7.1...