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Message: <blockquote data-quote="wew lad" data-source="post: 8374463" data-attributes="member: 665412">Use WinISD alpha, not beta. Beta has an easier GUI, and alpha has more in depth options such as port velocity.Changing the port size will change the tuning of the box, so what I'd recommend is choose your volume, then choose your tuning frequency that gives you the most gain where you want it (or flat if you want that). Then go to the port tab to see what it recommends, if you need a square or circle click on that. Modify it to your needs and try to keep it as close to your original tuning frequency while keeping port velocity low. Ideally you want less than I think 10% the speed of sound (this is where air compression starts, and you'll get noise, complicated subject I'll leave it at that). Ends up requiring a port velocity under 30m/s or so.</blockquote>

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