Calculate Length of Vent or Port

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

Calculate Volume of Box

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

Calculate Tuning Frequency

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

Calculate End Correction Factor

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