okay first you have to get the min and max aloud air space for the speaker then do Length * Width * Height = "Your Number" / 1728. Then with your final number like a deciaml number 1.* or 2.* or even 3.* then multiple that number by the thickness of the wood you are using.
Like for mine when i built it...it was 42 * 13 * 9 = 4914 / 1728 = 2.843 * 3/4 = 2.13 Which was the cubic feet of my box.
Then after you get your number divided that will show you what cubic feet you have! For min when i did mine i had to be between 1.75 cubic feet and 2.25 and ended with 2.1. Its really simple!
Hope that helps!
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