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Vented Ported 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 box or enclosure volume.

box volume


Inputs:
speaker total Q at fs (Qts)
equivalent air compliance (Vas)



Conversions:

speaker total Q at fs (Qts)
=0
=0
equivalent air compliance (Vas)
=0
=0
meter^3


Solution:

box or enclosure volume (Vb)
=NOT CALCULATED 


Other Units:



Change Equation
Select an equation to solve for a different unknown

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

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

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

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

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

sound pressure level
sound pressure level sound pressure level
free air reference efficiency free air reference efficiency

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

cone effective radiation area
cone effective radiation area cone effective radiation area
cone diameter plus one third of surround cone diameter plus one third of surround

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

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