Alight I have 5.38 cubes after displacements other than port. Im using an 8'' port. I put 12.75'' of port inside the box and that leaves me right at 5 cubes after its displacement. I then have 7.8'' of port outside the box. I want to tune to 32hz and I think I have too much port on the outside. 12.75'' is my max inside so that I can have 8'' between bottom of box and port for it to vent. Any help? This is my first time building a box and using tube ports. I already have the port in, but I can cut it easy.