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I want to add a powered subwoofer to the factory rockfordfosgate sound system it’s ok but I don’t want take out anything like the sub I just want to put a 12 inch on their side any one got any suggestions
 

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Rip the interior out. Seats, console, some interior trim and lift some carpet. Take a multimeter to the head unit and amp and look for something to use as the amp on wire and slap a relay on it.
Or find a cig lighter that is only on when the key is on and slap a relay on that. Add a switch in series on the non-coil side of the relay. Use that as the amp on wire.
Now find sub audio line; on the head unit, amp or sub and run that through your new second amp. Lay down your positive wire, create a ground and build a box.
 
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