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AJ Subwoofer Vent Equations and Formulas Calculator
Home Theater Sound Systems - Car Audio


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:
Dv = 0    = 0  centimeter
Np = 0    = 0  
Vb = 0    = 0  liter
fb = 0    = 0  hertz
k = 0    = 0  


Solution:
vent length (Lv)  =  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 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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