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Message: <blockquote data-quote="turtlestrap" data-source="post: 8366095" data-attributes="member: 664141">i just put in 3.0 ft^3 for volume and a rectangular port with 24 in^2 area and 11.25 in long with .732 end correction.  No idea what end correction is, but it auto-filled it in, so I left it.  And all that gives 37.46 Hz tuning frequency.And with 500W at 1 ohm with all the t/s parameters I found online for the AB XD 1222AB, you will have max port velocity at ~103ft/s which is equal to ~31 m/s.Either way, I think your port is too small.  Depending on the source, people try to keep max velocity anywhere from 15m/s - 25m/s.  That being said, I have no idea how fast air has to be moving for you to hear it.  Increasing port area will make port longer and force you to make your box bigger to keep volume where you want it.</blockquote>

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