Subwoofer Vent Equations Formulas Calculator

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Subwoofer Box Comparison Calculator:
Compare bandpass, sealed and vented frequency output graphs for a subwoofer in one program.

Problem:

Solve for length of vent or port.

Enter Calculator Inputs:

diameter of vent (Dv)

number of ports (Np)

unitless

volume of box (Vb)

frequency of box (fb)

end correction factor (k)

unitless

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Solution:

Enter input values and press Calculate.

Solution In Other Units:

Enter input values and press Calculate.

Input Unit Conversions:

Enter input values and press Calculate.

Change Equation or Formulas:

Tap or click to solve for a different unknown or equation

Subwoofer Box and Speaker Enclosure

	vent or port length
	minimum vent or port diameter

k values:

vent has one free end and one flanged	=	0.732
vent has two free ends	=	0.614
vent has two flanged ends	=	0.850

Where

Lv	=	length of port or vent
Dv	=	diameter of port or vent
Dmin	=	minimum diameter of port or vent
Np	=	number of ports or vents
Vb	=	volume of box
fb or Fb	=	tuning frequency
k	=	end correction factor
Sd	=	surface area of subwoofer
Vd	=	driver displacement volume
Xmax	=	maximum linear displacement of driver

References - Books:

See 6 on reference page

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By Jimmy Raymond

Contact: aj@ajdesigner.com