Ok, i need help. i need a custom ported box for4 JBL GTO 10's.. The prices around here are frigging ridiculous.. like $300.. anyway.. I know how to use to tools and glue and whatnot.. my only problem is what dimensions to do.. should i run 2 chambers with 2 subs per chamber and a slot port per chamber.. or run one chamber with all 4 subs and one huge port? also, i have no earthly idea how to tune the port.. like, tuning at 35hz and whatnot.. any help is greatly appreciated!