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Boss BASS1500 powered subwoofer. I have had one under the back seat ever since I owned my truck. It fits perfect. No rattling or hearing loss. The best amount of bass in sync with my 6 1/2 3-ways in the doors. Just to let everyone know.
P.S.- Makes other back seat activities extra enjoyable.
but stock headunits dont have the preamp outs, not sure about the infinity system. i used to have a mtx thunderlink and it fit perfectly between the fold down seats and everyone thought it was stock
in the infinity system you can tap into the rca feeds to the factory amp (there is a module mentioned on here somewhere for the can buss)...if you dont have infinity you can use the white plug for high level imput to the unit