Well i hooked up to 15's in a ported box and a 600 watt amp with a pioneer hu and it BEAT for 600w but than i disconnected the amp to try on different subs and ended up never trying. i hooked it all back up but now no matter what i do the subs rattle and flex with no music. if the amp and deck are on and the rca's are plugged in it does it even with music playing but once i disconnect the rca's it stops. I think it may be the head unit. i checked every inch of all the wires and there fine. i dont get what it could be. Any suggestions? thanks alot