Need help deciding on subs my choices so far are. re audio sex 12's, obsidian audio 12's, sundown sa, or ssa dcons. All these subs seem to have great reviews. One if the biggest problems im having is finding a box to fit I have 36"L 15D 36w to work with and itneeds to be downfire every box I've found is too big or too small and I have no idea how to build one. What kind of amp should I get to power the subs? Thanks I really need to know in a cuple of days because I wanna order soon.