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Message: <blockquote data-quote="Micksh" data-source="post: 7801962" data-attributes="member: 637044"><p>Correct...You build the ported section to whatever you are planning it to be, (whatever ratio you prefer) then tune it at that sealed resonant frequency. There's a good thread over on CACO about all of it (over 1000 posts) that explains it all, though there's a lot of reading to get through to find it...here's the link though... <a href="http://www.caraudioclassifieds.org/forum/general-car-audio-discussion-questions/123066-4th-orders-why-some-people-so-quiet-them.html" target="_blank">4th orders why are some people so quiet with them? - Car Audio Classifieds</a></p></blockquote><p></p>

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