AH man, I hope you didn't hurt the subs:crap:
You don't have another amp to try temperarily to see do you? A hard hitting sound with the woofers playing, sounds bad. Try playing each one free air, see if it does and if it does where it's coming from. Also, check your RCA connections they might have gotten damaged(?)
Other then that, I don't know that does NOT sound good:eyebrow: