I just hooked up a Denon 3801; it has been turning itself off and going into safe mode. I checked wiring, etc. -- it's not getting hot. My old EPI 1100 speakers are in the front, Polk csi400 center, polk m3 rears. No sub yet nor second set surrounds. The right front epi sounded "scratchy" already--lo and behold, the 10" speaker had blown a hole at the outer edge! Could this be affecting the signal to the receiver, causing it to cut off? Secondly, does anyone know if these speakers may have compatibility issues with the denon anyway? I can buy a replacement woofer (or two) from Human Speakers for $54- apiece. This is the first time I'm trying to set up HT; I really appreciate your input--thanks for the forum.