Thats my prob. I had a sweet site with a bunch of free plans that I lost lol. So I am trying to make my own box plans. I just started throwing out some dimensions to see what kind of volume id get and then found out how big my port needed to be. So the gross volume is the 1.917 and the net would be 1.674. That is thaking the ports and port wall into consideration.

What would the displacement of the subs be? The manual has:

displacement front mount:.092ft^3
displacement rear mount: .115ft^3
added volume reverse mount: .047^3

So Im assuming that the displacement would be the second one there. So since im using 2 subs I would have to take .230ft^3 away from the internal volume.

What is confusing me here is this. If I figure out the port volume using the gross internal volume, then the volume to box takes up changes the internal volume, so does this throw everything off? By figuring out the port length using a 1.917^3 box, then subtracting the port volume to get 1.674ft^3, the volume has changed and thrown off the tuning frequency so everything is ****ed.