Slotted port area vs Circular port area

How to calculate subwoofer port length? What is the end correction factor ? Why get a subwoofer in the first place?

Music in the Round · The The S5e's woofers are reflex-loaded, but not with the usual cylindrical port Rather, the drivers are slot

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slot machine inventor Slot port = more material to build, more difficult to tune, but adds some rigidity to the box Aero port = easy to use and tune, looks cool,