a calculator //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
http://www.carstereo.com/help/Articles.cfm?id=31
http://www.mobileinformationlabs.com/HowTo-1Woofer-Box-CAL%20Port%20lenth%201.htm
dont forget u need to enter vb only
so determine how much space you have then determine what ur sub needs for actual volume after port displacement then enter that number as volume
ie...
if you have 6cf available space and the sub needs 3.5 enter 3.5 then add the port cf displacement to the total and that will be your gross cf of the box
so say 3.5 tuned at 38hz with 3- 4" ports = 17.18" long for each port then figure the cf of all the ports displacement ( r x r x 3.14 x 17.18 /1728 = .124873 cf for each port x 3 ports = .3746 so your box needs to be 3.8746 gross internal //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
did i confuse you any lolz
if ya cant figure it out just get bassboxpro 6 //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif