Help with 15" sub box calculations

barkingspider

CarAudio.com Newbie
I am building a box for a single L7 15 sub and want to tune it to around 28 hertz
The external dimensions are 31"x 32" x 12"/ The port is 5 5/8" x 10.5" x 34"
using 3/4" mdf
If someone could please help check my calculations it would be greatly appreciated
here is a photo of the box
 

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barkingspider

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