Anybody have the problem with the sounding loud at first all normal until you drive off then the sound starts to sound less loud at the same volume?? I have a amp but I don't know what kind all it says is Premier on it I bought the 04 TL without knowing it came with the car . The wiring is factory grounded with everything stock no subwoofers. Can anybody give any insights on why I am losing sound?? From what some people told me it could be my wiring or the amp is using up too much juice idk. Please help and I don't really know much about cars..