My old Porsche has this headunit
http://www.pioneerelectronics.com/PUSA/Car/CD-Receivers/DEH-P510UB

and it has what I think are Polk Audio components in the front doors.

The prior owner was pushing the components, a set of rear shelf speakers, and a small sub with an amp. He didn't include the sub or the amp w/ the sale of the car, so at the moment i've got no tunes w/ the exception of a secondary exhaust delete pipe, plus i've got a bunch of unused RCAs, speaker cables, and other wiring I need to remove from the car. I don't want any of that noise anyway.

So please explain to me how I should proceed to hook up the existing headunit to the existing door components, set up crossovers, or what have you, so I can make it sound decent.

Thanks.
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My FlickR y0!