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Probably too late now but I will say it for anyone else that runs into this issue. I have the same Sony (not that’s it matters). The line levels with mix and match of stock amps and aftermarket on these systems make it a mess. I put the Sony in and a JL sub with Excellon amp. The sensitivity of the stock speakers with the higher output head unit make the stock speakers distort at less than 10% volume. The sub is hardly heard because normally at 10% you wouldn’t want it loud. You have to be able to level the outputs to make it sound good. My “throw the spare head unit in for a cheap fix” project turned into a full blown build.
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