If this will be your first box you can try to use http://www.subwoofertools.com/forum/ported-box.asp
Or http://www.reaudio.com/speaker_box/LPort_Box_Calc.html for 3D view //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
With these you can get right tuning freq.
Or http://www.reaudio.com/speaker_box/LPort_Box_Calc.html for 3D view //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
With these you can get right tuning freq.