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ok...let me get this straight. You have a 4 ch amp, 4 speakers and 1 sub. Your amp can't power all of them because you would need 5 ch. So what we are trying to say is that you probably have your amp powering the front speakers and your sub. The rear speakers are must be powered by the stock HU......Unless you have an aftermarket HU that we don't know about....
 
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