I have been looking around on here for a few weeks. All I have to say is a lot of you have some really good set-ups! Can't wait to upgrade my system, its in the process. I have an '02 Yukon, Ohio 400 amp alt., 3 batts,0 gauge wires, ap3001d amplifier,Diamond Audio D6 components powered by an Autotek 900,and A Kenwood KDC-mp745u Head Unit, and I am shopping for an 18" woofer, and am doing the Big 3. I am always up for suggestions on any products! Thanks everyone.