port displacement help

[Audio4ever 10+ year member]

How do u subtract aero port displacement when makin a box?

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[DNick454 10+ year member]

Just as you said it... you just subtract and recalculate. Formula for volume of a cylinder is Pi times radius(squared) times the length of port itself. Then just subtract that from the total volume inside the box. Subtract from that the displacement of the subwoofer itself and you have the exact net volume you will end up with (minus any internal bracing if you choose to do so).

 

[SPL Blazer 10+ year member]

Subtracting the straight tube part is the easy part, calculating the displacement for the flared ends is a little more difficult. I guesstimate that part when I build my Aero Port boxes. Being off just a little won't be a big deal, not for music anyway.