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Circle Port to Slotted Port Calculator

Slotted Port Calculator for sub woofer box design.



Circle Port to Slotted Port

  • This calculator will convert a circle port into square inches in order to build a slotted port for your woofer box.


  • Enter the diameter of the port you are using, then press the "calculate" button to find the equivalent surface area.         





  Circle to Slot
Circle Port Diameter in Inches
Slotted Port Surface Area in Square Inches






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