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Ported Vented Subwoofer Box Equations Formulas Design Calculator
Low Frequency Enclosures - Car Audio - Home Theater Sound System

Subwoofer Box Comparison Calculator:
Compare bandpass, sealed and vented frequency output graphs
for a subwoofer in one program.

Solving for end correction factor.

Inputs:
 vent or port diameter (dv) meter attometer centimeter chain dekameter decimeter exameter femtometer foot gigameter hectometer inch kilometer light year link megameter micrometer micron mile millimeter nanometer petameter picometer rod terameter yard number of ports or vents (Np) enclosure box volume (Vb) meter^3 barrel UK barrel US dry barrel US federal barrel US liquid barrel US oil petroleum bushel UK bushel US dry centimeter^3 cord firewood cord foot wood cup Canada cup metric cup US deciliter foot^3 gallon UK gallon US liquid inch^3 kilometer^3 liter milliliter ounce UK fluid ounce US fluid pint US quart US stere tablespoon US teaspoon US yard^3 tuning frequency (fb) hertz 1/second cycle/second rotation/second port or vent length (Lv) meter attometer centimeter chain dekameter decimeter exameter femtometer foot gigameter hectometer inch kilometer light year link megameter micrometer micron mile millimeter nanometer petameter picometer rod terameter yard

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Conversions:
 vent or port diameter (dv) = 0 = 0 centimeter number of ports or vents (Np) = 0 = 0 enclosure box volume (Vb) = 0 = 0 liter tuning frequency (fb) = 0 = 0 hertz port or vent length (Lv) = 0 = 0 centimeter

Solution:
 end correction factor (k) = HAS NOT BEEN CALCULATED

Other Units:

Change Equation
Select an equation to solve for a different unknown

efficiency bandwidth product
 efficiency bandwidth product speaker resonance frequency speaker electrical Q

box or enclosure volume
 box or enclosure volume speaker total Q at fs air volume with same acoustic compliance as the speaker suspension

box or enclosure tuning frequency
 box or enclosure tuning frequency air volume with same acoustic compliance as the speaker suspension box or enclosure volume speaker resonance frequency

box or enclosure tuning frequency
 minus three decibel half power frequency air volume with same acoustic compliance as the speaker suspension box or enclosure volume speaker resonance frequency

peak sound pressure level
 peak sound pressure level speaker total Q at fs equivalent air compliance box enclosure volume

sound pressure level
 sound pressure level free air reference efficiency

maximum air volume displaced by cone excursion
 maximum air volume displaced by cone excursion cone effective radiation area cone peak linear displacement

 cone effective radiation area cone diameter plus one third of surround

port or vent length
 port or vent length volume of enclosure or box tuning frequency end correction factor

minimum port or vent diameter
 minimum port or vent diameter maximum air volume displaced by cone excursion tuning frequency

References - Books:

1) Dickason, Vance. 1991. The Loudspeaker Design Cookbook. Audio Amateur Press. 4th ed.
2) Steele, Brian. 2002. The Subwoofer DIY Page v1.1. http://www.diysubwoofers.org.
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