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Port Area question??

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00GREENMACHINE

00GREENMACHINE
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is there a general rule of thumb about how much squares inches you need? I am getting ready to get 3 10's PBX evolution subwoofers and I need 3.0 cu ft and the box was drawn up with a port width of 3.75 inches that is tuned to 32 hz and 46.875 square inches.

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00GREENMACHINE

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