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Message: <blockquote data-quote="shredder2" data-source="post: 8628249" data-attributes="member: 674047"><p>Use the ports EXTERNAL diameter when figuring displacement, I get about .4ft3. As far as the bracing goes, just figure it as best as you can and add that amount, don't forget the driver displacement as well. It's probably .12-.15ft3 so it'll change tuning... you're building this thing, just do your best to end up with 2.25ft3 internally and the dual pvc ports listed at 23" long will put you around 32 hz</p></blockquote><p></p>

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