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.

Solving for minimum port or vent diameter for a vented box or enclosure.

minimum port vent diameter

Inputs:

Conversions:

driver effective diameter (D)	=	=	centimeter
linear displacement maximum (Xmax)	=	=	millimeter
box ore enclosure frequency(fb)	=	=	hertz
number of ports (Np)	=	=

Solution:

minimum port or vent diamter (Dmin)

HAS NOT BEEN CALCULATED

Other Units:

Change Equation
Select an equation to solve for a different unknown

Subwoofer Box and Speaker Enclosure

	vent or port length
	minimum vent or port diameter

Note
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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