i bought the panasonic 980000U not too long ago, put it in and everything worked amazing. week or so ago when i would turn my car off my sub would hit real hard right as my headunit powered off. changed the sub with another type r i had layin around, same shit. checked all the wires, changed all the grounds, same shit. took the sub rca's out and put them in the rear rca's and it works fine. wtf.now it doesnt sound near as good so im pissed to say the least did my sub rca's just go bad? can it be fixed or am i just fucked?TIA