Right I've just prurchased 5 lab horns(eminiamce lab loaded), 2 USBs with celestion Ftr's, and a turbo tms4. I've got a couple questions. Basically at the moment I want to use 4 labs one USB and get some different tops to go on top (recommendations would be handy), so am I right thinkikg that I should cross the labs from 30-80 and the USBs 80-180) or the drop from the tops. I'm also not sure how the impudence would work, they are 6oms drivers wired in parallel so that's 3ohms a cab and could wire them in series parallel to an amp to get a 3ohms load 2 cabs a channel. Is that correct? And will most amps run 3ohms? Should probably add that I'm probably going to get 8 or 12 labs in total to sit under the 2 USBs, what would be good for the top end?