1g cd player issues.

[92AWDTalonTSI]

Well after replacing my radio because my rear driver's side rear and passenger side front speakers didn't work. THEY STILL DON'T WORK!!! So I'm thinking it is an issue with wiring. After looking through the side panels I have not found any shorts of any kind. But there is a large heat-sinked aluminum box under my radio. I believe it is a post amp. From what it looks like the wires from the harness go to this box then to the speakers. Could this box be my culprit? By the way I have a head unit with cassette and a CD player below connected with a 9-10 pin din. Another din goes to the aluminum box.

Any info is appreciated. Thanks!

 

[1995gsx20g]

check the resistance of the two speakers also..