help with final calculations

[rain377 10+ year member]

View attachment 26503086

Box will house 2-15" fi bl. According to the calculations i came up wwith it will be about 3.2 cuft tuned to 32hz. port coming out of the front will be 5" wide splitting into 2-2.5" along the back wall. if you see anything wrong let me know. external dimensions are 40" wide 24" deep and 18" tall. Will also have a double baffle on the front.

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