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<blockquote data-quote="DFW40" data-source="post: 2396405" data-attributes="member: 556468">Try this site as well&nbsp; <a href="http://www.the12volt.com/caraudio/boxcalcs.asp" target="_blank">http://www.the12volt.com/caraudio/boxcalcs.asp</a>When you go from round to slot or square it gets a little tricky. For example what is a 6 inch round port equivalent to on a slot port. You have to be able to figure out the port area of both to be able to compare apples to apples. The formula for area of a round port is pie (3.14) x&#039;s radius ® squared. So for a six inch port this woud be : 3.14 x&#039;s (3) squared= 3.14 x 9= 27 or 28 inches roughly. So for a slot port to be the same it would need roughly the same area so a port that is 2 inches by 14 inches would be 28 inches of port area so these ports would be close to the same area. But remember that perfectly square ports and round ports are a little more effecient that the long slender ports because&nbsp; the drag of the air having to pass over all of the woods surface area on the solt ports causes the air to move slower than the air through the round ports.The easiest way IMO to get the largest amount of port area in a box is to use the slot port like this one....<img src="http://i36.photobucket.com/albums/e38/rossmcelroy/stereo017.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i36.photobucket.com/albums/e38/rossmcelroy/stereo021.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="DFW40, post: 2396405, member: 556468"] Try this site as well [URL="http://www.the12volt.com/caraudio/boxcalcs.asp"]http://www.the12volt.com/caraudio/boxcalcs.asp[/URL] When you go from round to slot or square it gets a little tricky. For example what is a 6 inch round port equivalent to on a slot port. You have to be able to figure out the port area of both to be able to compare apples to apples. The formula for area of a round port is pie (3.14) x's radius ® squared. So for a six inch port this woud be : 3.14 x's (3) squared= 3.14 x 9= 27 or 28 inches roughly. So for a slot port to be the same it would need roughly the same area so a port that is 2 inches by 14 inches would be 28 inches of port area so these ports would be close to the same area. But remember that perfectly square ports and round ports are a little more effecient that the long slender ports because the drag of the air having to pass over all of the woods surface area on the solt ports causes the air to move slower than the air through the round ports. The easiest way IMO to get the largest amount of port area in a box is to use the slot port like this one.... [IMG]http://i36.photobucket.com/albums/e38/rossmcelroy/stereo017.jpg[/IMG] [IMG]http://i36.photobucket.com/albums/e38/rossmcelroy/stereo021.jpg[/IMG] [/QUOTE]

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