hmmm, seems ok. Can't find my calculator to double check //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gifbeat how does this sound. Came up with this one all on my own.
Port length 36.25, 46.5 area. Tuned to 28. 3.5^3 box volume. Port is 3" wide