Subwoofer Vent Equations Calculator

Home Theater Systems Car Audio Formulas


Subwoofer Box Comparison Calculator:
Compare bandpass, sealed and vented frequency output graphs for a subwoofer in one program.
Solving for length of vent or port.
subwoofer vent port length

Inputs:

diameter of vent (Dv)
number of ports (Np)
volume of box (Vb)
frequency of box (fb)
end correction factor (k)


Conversions:

diameter of vent (Dv)
= 0
= 0
centimeter
number of ports (Np)
= 0
= 0
volume of box (Vb)
= 0
= 0
liter
frequency of box (fb)
= 0
= 0
hertz
end correction factor (k)
= 0
= 0

Solution:

vent length (Lv)
= NOT CALCULATED

Other Units:


Change Equation
Select to solve for a different unknown
Subwoofer Box and Speaker Enclosure
vent or port length vent or port length
minimum vent or port diameter 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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