box width: 35.00, box height: 13.00, top depth: 16, bottom dep: 16.00, wood wthick: .75, square port width 3.0, square port length 2: 13 box volume 2.613 tuned frequency: 31.71, displacement should be about 1.7 or so for the 33-35 pound custom tc9. i did this off of re audio box calc