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<blockquote data-quote="OLD_SCHOOL" data-source="post: 559015" data-attributes="member: 556272">the more port area you have the longer a port will be for exampleusing a port area of 60^2 and 29 hz in a 4 cube box(60 * 1.84x10^8)/ (4 x 1728 (29/.159)^2) - (.823 * sqrt of 60 ) = 41.6386 inche long portsame thing only this time with 180 in^2 of port area(180 * 1.84x10^8)/ (4 x 1728 (29/.159)^2) - (.823 * sqrt of 60 ) = 144.041 inches longso as you can see increasing port area increases port length for same tuningto determine the amoutn of port area you need involves several things such as your listening taste whether you want more spl or more Sq your car the amount of power your using... and the amount of port area&nbsp; needed to keep port noise downyou can tune a box using a 4 x 12.5 inch peice of PVC in a 4 cube box to ~23 hz but the port noise would be nastyMat</blockquote>

[QUOTE="OLD_SCHOOL, post: 559015, member: 556272"] the more port area you have the longer a port will be for example using a port area of 60^2 and 29 hz in a 4 cube box (60 * 1.84x10^8)/ (4 x 1728 (29/.159)^2) - (.823 * sqrt of 60 ) = 41.6386 inche long port same thing only this time with 180 in^2 of port area (180 * 1.84x10^8)/ (4 x 1728 (29/.159)^2) - (.823 * sqrt of 60 ) = 144.041 inches long so as you can see increasing port area increases port length for same tuning to determine the amoutn of port area you need involves several things such as your listening taste whether you want more spl or more Sq your car the amount of power your using... and the amount of port area needed to keep port noise down you can tune a box using a 4 x 12.5 inch peice of PVC in a 4 cube box to ~23 hz but the port noise would be nasty Mat [/QUOTE]

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