How Do You Determine Port Area When Designing Enclosures?

Two subs to an enclosure, how to calculate adequate slotted port size? slot port area calculator part 1 how to build a Subwoofer Box Calculate the box volume using cubic ft Port Area Port slot free spin no deposit I also came with this idea The red section is just all the port area section that enclosure needs to be tuned, green section is the same slot

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