Woofer Port Calculations

Length of Port	Volume of Box	Tuning Frequency	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

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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

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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

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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 =

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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

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