Can someone check the tuning for me?

[QuestionMan 0]

Could someone check and make sure this is right for me?:

39.5 x 21x 20.25 box (outer dimensions, i'm using .75" mdf)

4.5 x 19.5 port (10.57 in. diameter, if you need it)

24 inch port length

i got just a little below 33 hz. I just don't want to find out it's wrong after i make the cuts and all.

Thanks a lot

[KU40 173]

Port displacement is 1.42 cubes.

sub displacement?????? I'm guessing .2 cubes.

Therefore, box volume is 6.4 cubes. tuned to 34 hz according to winISD.

What's 10.57 in. diameter?

[QuestionMan 0]

What's 10.57 in. diameter?

On some of the formulas it asks for the ports diameter, so i put it in just in case.

Thanks!