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Sounds like wiring
Honestly, I do not know much about car stereos, I have installed a couple, but nothing very advance (woofers and what not) But if it were me and I had tried 4 different decks I would say that it is much more likley that it is a wiring problem. The likely-hood of 4 bad decks is very slim. I would take off all the extras, such as your amp and woofers and just attempt to get it working on the regular stereo system. You could always go talk to your friendly neighborhood car audio retailer for advice also.
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