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the only thing the pac adapter is doing is running ur bose subs in the doors the twiddlers are powered straight from the radio, id check some radio settings see if the bass boost or something is on, otherwise i woudl rip the bose stuff out of the door and put a 6.5 coaxial in the door and power from radio or ideally 6.5 components set and amp it
IMO you really need to do an amp and components, otherwise a set of 6.5 coaxials off the deck would work as well but IMO it may not get loud enough for you
polk db651 gets my vote for a cheap coax that works well