I've started slightly, I've had my fair share of simple setups and I think I'd like to go big now. I do have an idea of turning my trunk to the whole box, and inverting the speakers in place of where the back seat would be, I'd love to get 2 AA SMD's simply because astetically they'd look beast like that and they bang hard anyway.
Ifnot, I plan to go the DC route, with at least 2 lvl 4 XL's or better.
the one issue i got tho is the back wall behind the rear seat is just cluttered with fuse boxes & a bunch of crap from the bose system.
this post on this caddy forum should help elaborate on my troubles thus far and upcoming.
http://www.cadillacforums.com/forums/cadillac-audio-video-security-systems/211854-installed-oem-hu-now-no-sound.html#post2422667