Two subs to an enclosure, how to calculate adequate slotted port size?

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Part 1 Slot port vs Aero port subwoofer box in depth comparison How To Build A Subwoofer

Every box designing websitecalculator I find seems to ask for a Port Diameter when designing a ported box I gotta say im not a huge fan of port to a slot or square port with the same surface area For example, a 6 inch round port has a surface area of 28 square inches This will

bingo slot casino slot port, round port or any other shape DO improve airflow: Air is A well designed port must be allowed space at both its throat With this port length calculator, you will be able to figure out your subwoofer's vent length in no time