Ok so I just put the exterior dimensions in a box calculator and says I have 10.85 cubic feet, that's taking in the factor of the 3/4 box materials, but not the port, bracing and sub, and the TC2 15 says 3.5max per 15, so that is a total of 7 cube for both, leaves me 3.8 for port and sub displacement, please correct or let me know if I am doing something wrong here, thanksBtw thanks for the comments from everybody already.
This is what I got.?
Width 41"
Height1-32"
height2-21"
Depth-20.5"
Thickness-.75
Inter vol= 10.85793 cu ft