you have an eD ampno, the subs are fine..........the h/u is fine......amp is recieving good voltage and everything is wired ok....could this be from a bad ground? And if so, why all of a sudden?
but when you say the subs sound distorted, is it at low volumes also? how did you set the gains on the amp?
also, have you tried swapping subs/swapping amps?