its hard to describe what i think it is with words but here is a shot.
you basically have the front peice(side with port) that has a narrow long slit in the wood. then if you would look inside the port there are wood pieces down both sides and the top and there is an opening and the very back that vents into where the sub is in the chamber. IS this correct?? If so how do I measure the surface area of that port compared to the surface area of the round ports??
please help im really interested in making this box myself. also if anyone has had experience with this box...does it slam?