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<blockquote data-quote="squeak9798" data-source="post: 2133611" data-attributes="member: 555320">Each port should be that length.When you increase port area by using dual ports, the length of each port must be increased to compensate for the increased port area.To figure the length of a port for a dual-port enclosure, each port should be the length of the desired tuning frequency for half the enclosure size.For example; if you have two ports, each 4&quot; in diameter, and a 2cuft enclosure with a desired tuning frequency of 32hz......then you &quot;calculate&quot; the length of each port based off of how long a single 4&quot; port in a 1cuft enclosure would need to be.If you model a 1 cuft enclosure with a single 4&quot; port tuned to 32hz, and a 2cuft enclosure with dual 4&quot; ports tuned to 32hz, the port length of all the ports will be exactly the same....30.11&quot; according to my calcs, apparently 29&quot; according to WinISD.I did a really bad job of explaining that.... //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif&nbsp; Did it make any sense?</blockquote>

[QUOTE="squeak9798, post: 2133611, member: 555320"] Each port should be that length. When you increase port area by using dual ports, the length of each port must be increased to compensate for the increased port area. To figure the length of a port for a dual-port enclosure, each port should be the length of the desired tuning frequency for half the enclosure size. For example; if you have two ports, each 4" in diameter, and a 2cuft enclosure with a desired tuning frequency of 32hz......then you "calculate" the length of each port based off of how long a single 4" port in a 1cuft enclosure would need to be. If you model a 1 cuft enclosure with a single 4" port tuned to 32hz, and a 2cuft enclosure with dual 4" ports tuned to 32hz, the port length of all the ports will be exactly the same....30.11" according to my calcs, apparently 29" according to WinISD. I did a really bad job of explaining that.... [IMG]//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif[/IMG] Did it make any sense? [/QUOTE]

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