This thread should really be sticky'ed since this question comes up over and over.

As for the rear speakers, we tapped into the two open pins with some power cables from a computer power source. Worked pretty well and we had them laying around. I have fader control. Too bad I didn't see this write-up when we did the install.

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2003 4.6is, Saphire Black on Black with Aluminum trim, Comfot Seats, Loading floor, Nav, TVonNav, Focal Utopia's in front, with Rainbow's in back, Helix 5 channel amp. ACS pedals, Aluminum steering wheel trim, X-pipe