Hey i am having a new box built since the one i have is just a little to big. The sub is a re sx 15" currently it is tuned @32hz w/ 4 cu ft. Its nice and loud but i dont think its reaching its full potential.. (the box is a prefab..but its a pretty nice one.) i got it from dimensionaudio on ebay.. paid like 150 bucks for it..i kick my self in the *** for that one. Anyways i want some suggestions on good box setups for the sx.. I want to keep it around 4 cu ft. What the best tuning freq. for this sub to get really loud while keeping ok sq. I was thinking 36-38 somewhere