Check this for me

[tuck05 10+ year member]

4 cuft net tuned to 38 hz. Inside of port is 15.5" high x 3" wide x 14.5" deep. 15.5*3.75*14.5/1728 = .49cuft of port area. .2cuft for the sub. 4cuft +.49+.2=4.69cuft. 24"x24.73"x17" with wood should get me 4.69cuft.

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[Trixter 10+ year member]

port area is measured by multipling the width X height of the opening....you have 43.5sq".

to tune a 4cu' box to 38hz using a port with the area of 43.5sq" the port will need to be 14.89" long....make your 14.5 a 14.75 and you be closer

 

[tuck05 10+ year member]

Thanks man. I will add the 1/4".