# 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. ## Inputs:

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

## 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

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 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 = 0.85
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