I've just got my Dahlquist system 2 and HK 525 and I noticed that there is some crackling sound from the center channel. So far I found the problem only in Starship Troopers(1:00:42 and 1:16:12) and Back to the Future 1(1:44:08). Those scenes contains explosions and roaring sounds from the center channel. I tried to turn off the subs, lower all other channel volumes, switched the center speaker with one of my main, and the problem is still there. I can still hear the crackling sound even after I turned the volume down to -50/-55. From reviews, I have not heard any sound problems with those dvds either, so now I'm thinking whether it might be the receiver problem. Anybody can help?