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i spliced my subwoofer into my rear speaker and my subwoofer level on the stock head unit still affects my aftermarket output. Probably because the headunit simple has 4 outputs and at the stock amp, the subwoofer is also spliced into the rear speakers and it just uses a LPF. Most of this is just speculation based my experience with my stock system in my Si... Why was such an old thread dug up newayz? lol
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