Ok. I am looking to install an eclipse AVN 5435 in my 2002 lincoln LS. Before I start, I would like someone who has done this installation or any aftermarket information to shed some light on the wiring issues. Can this unit be installed and keep the factory speakers and amplification? According to my schematic, it shows 4 main speakers being powered directly from the headunit..then a subwoofer amp for the subs and a center imaging amp for center speakers. Is it possible to use ALL of the original amps and speakers? If so, what is involved in doing that? Also, on the schematic of the original system, the wires to the speakers are shown without a + or - so how do we determine which way to phase the speaker to the headunit? Any information from anyone that knows about this would be most helpful. I know I can handle the install, just want details before I start. Thanks!