Port area calculator : rCarAV

CALCULATE SUBWOOFER BOX PORT AREA & CONE AREA W COMPARISON INFO

Even though WinISD doesn't calculate port length correctly, it will give the velocity Run a few cases with different port cross sections like

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slot deposit 10 L = Length of Vent or Port D = Diameter of Vent N = Number of Ports V = Volume of Box F = Tuning Frequency K = End Correction Factor