I'll be running a "few" oldschool rf pumch hx2 12s. They'll have more than 500 watts each. RF recommends 0.8-4.0 cubic feet sealed and 1.75-4.0 cubic feet. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif So to anyone who has run them or knows about them, what size would you go with, both sealed and ported? Haven't decided whether I'll port them or not, that depends I suppose.