2002 GT Mach 460 only playing audio through tweeters

I have a 2002 GT Coupe that I bought 4 years ago that already had an aftermarket radio that uses the Mach 460 system, and it worked great. About 2 weeks ago I was driving home from college and I noticed that all my music had lost its bass. So after some investigating it's only playing through the 4 tweeter speakers that the match 460 has but not playing through the other 4 bass speakers (2 in door and 2 above rear seats). I checked the fuse for the rear amps and it is good. I also checked the connector behind the kickplate on the drivers side and that was fine and had 12 volts of power to it. I'm thinking maybe the amps died or something but can anyone else point me in the right direction as to testing for power to the amplifiers or tell me what they think is wrong?
 
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...I can take it. I think.
Mod Dude
Mar 2, 2003
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If I had to guess the interface went bad. It's an adapter that allows the head unti to work wth the stock system. It would be mounted behind the stereo. For what it's worth, I wouldn't try to replace it. Just get a whole new speaker system. Sounds better anyway.
 
If I had to guess the interface went bad. It's an adapter that allows the head unti to work wth the stock system. It would be mounted behind the stereo. For what it's worth, I wouldn't try to replace it. Just get a whole new speaker system. Sounds better anyway.
Well I went through the car checking all the connections in the trunk and everything checked out. The amp connecters had 12v and the grounds were good. So I said screw it and bought 2 used amps off ebay and sure enough the speakers work again!