Just a few questions might actually help me out. How did you come up with 5 inch being the right amount of port area? What does being in a truck box have with port noise?With too small of a port doesn't that create other issues besides port noise? How did you figure out the larger box higher tune wouldn't sound good? I think that's it. Oh wish I couldn't tell any difference between subs sure would save me a lot of money. As long as you're happy with it that's all that matters but I am curious about the questions i asked.