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The same as you would internal. But now you dont have to accomodate for the displacement of the port since it is external.
 

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I think the Torres calculator has provisions for external port.
 

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anyone know if square ports, help to, or eliminate port noise that circle can give if to small? could have sworn I read that in the "Loud Speaker Design Cookbook" a MUST HAVE, but that was years ago
 
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