I'm having a big party to celebrate my doctoral graduation in two weeks. I've been planning and looking forward to it for almost 2 years, and in fact it's one of the reasons I bought my audio system. I'm running an H/K AVR 525 with Athena Technologies speakers in a 7.1 configuration. All speakers have a sensitivity ranging from 90 - 92 db/W/m. I'm also using an SVS PB2-ISD sub. This is all set up in an unfinished, 4000 cu. ft. basement. The music will be trance and techno and I'm expecting 40-50 people (15-20 or so will be dancing in the basement). I want lots of volume. I just tested it at volume levels of 0 to +10 (with 0 calibrated to 80 db), and while the fan came on several times, the amp didn't shut down or noticeably clip. I plan to add extra fan ventilation during the party. I had it in 7 channel stereo mode and will be doing the same during the party. I'm wondering if any of you has done something similar with your 525 (or 510, 520, or 630) - i.e. played it at or near its limits for MANY hours on end, all channels driven, with challenging material, in a system of moderate sensitivity. Any of you damage or hurt your receiver doing something like this? How did it perform?