Its the best i could do with Microsoft Paint...but here is the "official" system diagram for my Lexus ISF. I don't think i missed anything. I also dropped my x-over frequencies to give a better idea of what i did.
FYI: The PBR 300x4 is running my rear door speakers by itself and has a switch to turn them OFF for better imaging. I can turn them on any time but i prefer to roll with JUST the front stage on.
of course, if you want to see how i got all of this in my car, click this link and prepare for about a thousand pictures.
http://www.stevemeadedesigns.com/board/topic/142076-ubllexus-is-f-sound-system-install-mechman-270a-alternator-installed-page-5/