I have in my 01GTP the Bose premium sound. Ive had my 12in 800watt pioneer sub and amp hooked up to it since I got the car, it sounded perfectly fine. One day the head unit started shutting the display off but still played music. around this same time the bass became almost non existent. I swapped in a different head unit, same thing minus the display shutting off- nearly no bass. upon inspecting wires i noticed if i moved the RCA cable it would cut in and out, so I decided to replace it, but while I was in there I replaced the ground and power wire from 8ga to 6ga. Its has a tiny bit more bass than before, but not what it used to be. The amp is turning on, the sub is getting power, just not getting the thump like before. Im thinking either the sub or the amp or maybe both are getting tired and on the way out, although I bought the sub a year and a half ago brand new. Any thoughts? Eventually Ill be going to 2 10inch subs in a better box but wasnt planning on doing that this year. If I can find it and didnt give it away, Im going to hook up my old Rockford Fosgate 400watt amp and see if anything changes(has 2 channel and 4 channel mode but doesnt work in 4 channel mode and never did since I got it). Im just a little baffled as to why all of a sudden its painful to listen to music in the car haha.