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AJ Subwoofer Vent Equations and Formulas Calculator

Home Theater Sound Systems - Car Audio

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:

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



Conversions:

driver effective diameter (D)
=0
=0
centimeter
linear displacement maximum (Xmax)
=0
=0
millimeter
box ore enclosure frequency(fb)
=0
=0
hertz
number of ports (Np)
=0
=0


Solution:

minimum port or vent diamter (Dmin)
=NOT CALCULATED 


Other Units:



Change Equation
Select an equation 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

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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by Jimmy Raymond

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