Unless your amp is broken, I think the spike is room driven. I had to adjust mine, but damn, 10 db? If you room half pillow and half concrete? I have a few ridiculous spikes around my room, but they are frequency-centric. Is your spike a pink noise spike or a specific frequency?

Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire