basically your system is amplified.

you have four speakers amplified by a bose amp under the pass seat (held on by 2 10 mm nuts) and an amplified sub in the rear spare tire area.


The adaptor that crutchfield probably sells is one that probably converts your speaker signals into RCA male connectors and I believe they connect to your RCA outputs on an aftermarket deck (from what i could remember vaguely)

hope this helps...