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 equivalent air compliance.

equivalent air compliance


Inputs:
peak sound pressure level (SPLpeak)
speaker total Q at fs (Qts)
box or enclosure volume (Vb)


Conversions:

peak sound pressure level (SPLpeak)
= 0
= 0
decibel
speaker total Q at fs (Qts)
= 0
= 0
box or enclosure volume (Vb)
= 0
= 0
meter^3


Solution:

equivalent air compliance (Vas)
= NOT CALCULATED


Other Units:



Change Equation
Select to solve for a different unknown
efficiency bandwidth product
efficiency bandwidth productefficiency bandwidth product
speaker resonance frequencyspeaker resonance frequency
speaker electrical Qspeaker electrical Q

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

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

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

peak sound pressure level
peak sound pressure levelpeak sound pressure level
speaker total Q at fsspeaker total Q at fs
equivalent air complianceequivalent air compliance
box enclosure volumebox enclosure volume

sound pressure level
sound pressure levelsound pressure level
free air reference efficiencyfree air reference efficiency

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

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

port or vent length
port or vent lengthport or vent length
volume of enclosure or boxvolume of enclosure or box
tuning frequencytuning frequency
end correction factorend correction factor

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