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Are you able to adjust the subwoofer volume level on the head unit, only it doesn't affect the subwoofer volume? If so, your installer may have used a line output converter on the stock wiring, or the amp may have a speaker level inputs that are being used.
I would check and make sure there is an RCA cable going from the head unit to the sub amp. If not there should be, because there is no reason not to use the subwoofer rca outputs on that head unit.
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