I have a 03 Chevy suburban. It's going with 3 of the 12" american bass xfl in ported box. Pushed by a Soundstream ta3000.d1 at 1.33ohms. Box tuning i know i want to be at 32hz @ 0db but design is what i looking for help with? Subs back or up port up or back.The way it is now is subs up port back.Never had it the other way.So please some feed back would be appreciated.O Cherryman customs is the builder.That guy knows his stuff.I know we are going to come to a bad a$$ outcome.I would like to hear WHAT YOU GUYS THINK ON DESIGNS!