Hammer, Getting bak to you on the 7700 heat question. Just to put things in perspective, I like my music loud. Ok, really loud, if you listen to my girlfriend.
During normal listening and even when watching movies fairly loud the amp runs only slightly warm. However, when I run music in 5 channel stereo mode and really crank up the volume I can get the amp to run pretty hot. I am going to get a larger rack with more vent space before hooking up the remaining two channels.