Converting round port to slot port?

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Port Length Calculator HowTo-1Woofer-Box-CAL

Measure down the middle, just like you are doing If the port ends so that one side keeps going you subtract half the width of the port form Since I've never seen two port calculators that would give the exact same port length for a given box volume and tuning frequency, the port calculations from

slot drawing callout The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance and electrical length or vice How do you calculate an enclosure for your specific subwoofer port sizenumber length is critical Subwoofers need to be rolled