Also if some of you guys are wondering, i will be using 1/2 mdf on the bottom and back of the box for alittle extra room. as i figure it I need .5 cubes per sub, so say 5 cubes total plus sub displacement. so .07 per sub. total 5.7 cubes, plus aeroport displacement aeroports will be 18" long, so roughly .13 displacment for each 4" flared aero port. total .78 cubes plus the 5.7 would be 6.48 plus a little bit for the braces so roughly 6.5 cubes would do it the box will be: 24" tall 12" wide bottom 9.25" wide top 54" long bottom 57" long top should be 6.48 cubes at just 54" long for the total box, not adding the extra 3" of length at the top of the box that will be 57" long instead of 54" long like the bottom