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how are the speakers wired? are all four channels used, or just two? i'm assuming you have dash speakers and door speakers. what happens when you adjust the fade (front to rear) on the head unit?
if you have the rear channels on your head unit open, you can add the rear speakers there. if you don't , then wire the dash speakers and door speakers in series (8 ohm load) and then wire in the rears to the other outputs on the head unit.
you're better off running a four channel amp here, but you can make do with the head unit.
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