I just got this receiver and a sub this last Wednesday... been really enjoying (re-enjoying?) some of my films with full 5.1 sound. Previous receiver only had 2ch ins, no optical and then there was that missing sub...
I haven't fully calibrated the system with a sound meter, yet. Did run through the automated setup, though.
My first question would be, at what volume level do the others that have this receiver run it at? I was used to a pretty low knob setting on my old receiver. When I first started setting up the Onkyo, I put the volume knob to 20 and thought I was having an input problem as I couldn't hear anything at all... It wasn't until around 35-40 that I started hearing anything out of the receiver and I watch films between 60-80 (loud, but not too loud). This is a pretty small room (10x11 or so), so I figured that the 604 would be "too much" power for this little space.
Normally I would blame the speakers, but they did pretty well, volume wise, on the old receiver (some POS low-end Sony receiver from pre-optical days). It also seems like the reference white noise for manually adjusting the speaker levels is at the proper volume.
It does run rather warm, doesn't it?
Not a problem in my environment, though.
It can pass non-standard HDMI resolutions. My HTPC is set to the native resolution of my HD72 (1280x768).
The sound is fantastic. Of course, I *am* comparing the sound to a POS receiver that was
pretty much only driving two front speakers and the center channel...
Hooking a HTPC 5.1 soundcard up to the discreet inputs on the back of the Onkyo sounds decent enough. I'm not sure if it's a good idea or not to do, though. If I shut down or power up the HTPC while switched to that input, the receiver will shut down from the "clicking" of the soundcard powering up. Definitely the fault of the card and not the receiver, though.