Nakamichi trouble with speakers
 

I am new to the site and have a question. I have a 92 SC400 with a Nakamichi system. I have sound coming from both my tweeters mounted even with the side mirrors but nothing out of the speakers belowthem in my doors. Also, I have my subwoofer but no rear speaker response. I pulled the amp and found it to be dry with some minor signs that couldmeanmoisture had once been nearby, no rust just a metalic powder onthe bracket that holds it in place. Could it mean thatI need areplacement rear amp or could it be the wiring or speakers? I pulled the rear seat and looked at the orangeandwhite connector behind the drivers seat. No corrosion and no water evidence there. Please tell me if anyone else has had this problem or seenit solved. Thanks.