# 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) meterangstromattometercentimeterchaindekameterdecimeterexameterfemtometerfootgigameterhectometerinchkilometerlight yearlinkmegametermicrometermicronmilemillimeternanometerparsecpetameterpicometerrodterameteryard
 number of ports (Np)
 volume of box (Vb) meter^3barrel UKbarrel US drybarrel US federalbarrel US liquidbarrel US oil petroleumbushel UKbushel US drycentimeter^3cord firewoodcord foot woodcup Canadacup metriccup USdeciliterdecimeter^3foot^3gallon UKgallon US liquidinch^3kilometer^3litermillilitermillimeter^3ounce UK fluidounce US fluidpint UKpint USquart UKquart USsteretablespoon UKtablespoon USteaspoon UKteaspoon USyard^3
 frequency of box (fb) hertz1/day1/hour1/minute1/secondcycle/daycycle/hourcycle/minutecycle/secondrevolution/dayrevolution/hourrevolution/minuterevolution/secondrotation/dayrotation/hourrotation/minuterotation/secondRPM
 end correction factor (k)

#### Conversions:

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