ok here goes-- My box is 4.9 cubic feet before displacement. It is tuned to 36hz. But it misses a lot of notes, and sounds like it is choking. there is not a lot of port at all, it is 3.5 inches in diameter, and only 1.5 inches deep. I used the12volt.com calculator to build it, and it told me to do this, so i did. But doesnt sound like a good idea, can anyone help me fix this ??