If the box has internal measurements of 6 high18 wide12 deep then the volume of the box is 1296172875 ft3. To calculate the volume of the port first we must calculate the area of its circular cross-section. Vb is the net internal volume of the speaker enclosure.
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To do this we will use the famous prĀ² Pi X Radius Squared formula. Meter3 Centimeter3 Foot3 Inch3 Kilometer3 Yard3 Liter Milliliter Deciliter Cord Firewood Cord Foot Wood Gallon UK Gallon US Liquid Ounce UK Fluid Ounce US Fluid Quart US. The formula is then volume box width x length x height. To calculate the volume of the port first we must calculate the area of its circular cross-section.