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I Removed the factory amp in the trunk and took the input from the HU (which is tied directly to the front stage) and put that through a cheap line level converter (you may not need to do this my Alpine amp only accepts line level input IE RCA)
I then split the RCA side of the line out and used it for Channels 1, 2 and SUB
I ran the channels 1 and 2 back to the door speakers (the sandard output side of the factory amp)
and...Sub out put goes to my Sub...no surprise right?
There is also a Amp on signal line in the factory amp connector...so that worked great, only had to run Power and ground to the AMP, and the doors don't rattle anymore because the mids in the doors aren't trying to act like subwoofers anymore.
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