## Woofer Port Calculations Calculate Length of Port Calculate Volume of Box Calculate Tuning Frequency Calculate End Correction Factor Information about the End Correction Factor More Information About Reflex Tubes & Ports ( ext. Link )

## Calculate Length of Port (L) Dv = Diameter of Vent Np = Number of Port(s) Vb = Volume of Box fb = Tuning Frequency k = End Correction Factor Lv = Length of Vent Dv : Centimeter Foot Inch Np : Vb : Liter Meter^3 Centimeter^3 Foot^3 Inch^3 fb : Hertz 1/Second k : Normally k = 0,732 Lv = Centimeter

## Calculate Volume of Box (V) Dv = Diameter of Vent Np = Number of Port(s)s fb = Tuning Frequency Lv = Length of Vent k = End Correction Factor Vb = Volume of Box Dv : Centimeter Meter Foot Inch Np : fb : Hertz 1/Second Lv : Centimeter Meter Foot Inch k : Normally k = 0,732 Vb = Liter

## Calculate Tuning Frequency (F) Dv = Diameter of Port Np = Number of Port(s) Vb = Volume of Box Lv = Length of Vent> k = End Correction Factor fb = Tuning Frequency Dv : Centimeter Meter Foot Inch Np : Vb : Liter Centimeter^3 Foot^3 Inch^3 Lv : Centimeter Foot Inch k : Normally k = 0,732 fb = Hertz

## Calculate End Correction Factor (k) Dv = Diameter of Port Np = Number of Port(s) Vb = Volume of Box fb = Tuning Frequency Lv = Length of Vent k = End Correction Factor Dv : Centimeter Meter Foot Inch Np : Vb : Liter Meter^3 Centimeter^3 Foot^3 Inch^3 fb : Hertz 1/Second Lv : Centimeter Foot Inch k factor =

## Information about the End Correction Factor (k)

In acoustics, end correction is a short distance applied or added to the actual length of a resonance pipe, in order to calculate the precise resonant frequency of the pipe. ... A theoretical basis for computation of the end correction is the radiation acoustic impedance of a circular piston.

Both ends flanged: k = 0.850
One end flanged, one end free: k = 0.732
Both ends free: k = 0.614

Normally, k = 0.732 is assumed <<< Back