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Well if it's not the speakers (obviously as you've checked this) then unless you've got a bad connection somewhere in the speaker wiring, most likely it's your headunit. If that's the case, then depending on where you got it, you're most likely hosed. Alpine only honors the warranty if you purchased your unit through an authorised Alpine dealer. Ebay does not count, as I found out when the tuner in my 9855 started acting up.
If you still have your original radio, I would try plugging that in and see if it makes a difference. If you still are having problems, then my guess is you've got a bad connection somewhere between the radio and the wire harness, assuming you just purchased an aftermarket harness adapter and didn't try to cut and solder the thing in directly.
Process of elimination man... it's not glamorous, but it sounds like you're already on the right path, checking the speakers and whatnot. I'll keep my fingers cross for you that it's not the HU that's messed up. Good luck to ya.
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