you would need to run the sub ib a flat line sq box then do test tones and after you find the resonant frequency (meaning your best hit single frequency) you build your enclosure around that. I use a computer program to find the best box for the most from that frequency.
wow way too confusing.. anyway you could just buy them set to your sub allready? im not to smart when it comes to this stuff and it would help out if i could just buy stuff and get it installed and listen.. lol
i recently made my own ported box, i dont know why ported boxes arnt used all the time, as far as i am conserend...when they are custom of course. The SQ is damn near the same, and the SPL increases like 8db, in my system anyways...it rocks, but make sure if you buy a ported box that it fits the sub PERFECt...otherwise your gonna get a port sound or something that isnt right.