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Message: <blockquote data-quote="hispls" data-source="post: 8730726" data-attributes="member: 614752">I have never had good luck with using multiple smaller ports but I have seen others have good success.  Hopefully it will work for you. The good news is that it is much easier to make box volume smaller than it is to make it larger after it is finished and you begin testing.  If you decide it is too big later it will be very easy to test by just adding wood or bricks to see how less volume changes output/response/tuning.   On the same thought you may also consider a method to easily change port length(s) after you have it installed.   I have had fine results with "sono tube" for large diameter round ports, I'm sure there is a similar product used for concrete pillars in Europe.</blockquote>

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