i bought the ipod fm thing to listen to it in the car. i got 2 12'' subs and the thing that sucks is that the sound coming from the subs is very weak, some songs wont even use the subs. so i wasted 60$ on this thing, so if i buy a deck that can use a usb port will it use all the sound of the subs, like a cd would? or is there a cheaper alternative to get the same quality of a cd?