Not for slot ports and alright I am building a box for a sp4 18 and it'll be like 9 cuft and I need a slot port tuned at 35hz the box will be 24in long by 24in wide and 36in tall do about 10 cuft but with all the displacements from baracing and the sub about 9 so I need to figure out the height, wideth and depth of the port! And it's in a 2002 dodge Dakota!