i want to build a box to house my 2 l7s for the back of my ranger the dimentions would be base=18.5 back wall=20 the front will raise 3.5" then tapper to the back wall its aproxx 5.5 cubes my question is i want to put a slot port at the bottom firing towards the seats w ea chamber 27" is that too wide for a slot port if i want the box tunned to about 34-36 hz??? any help would be great thanx