I recently acquired an HK AVR 320 and I love the sound etc but I am a little disapointed with the power. It seems I have to run it at close to max power for music DVD's and some movies. Even on 2 ch for music volume needs to be up there. Could I use my old NAD 7100 rcver for a pre amp? It has separate pre amp and power amp sections. Sorry if this is stupid question/idea but technical aspects not my forte. 2nd question- the HK also seems to shut down at times on its own. It has lots of breathing room and it does not seem to be when I am running it at high volume, just whenever. Any ideas?