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Sealed or Closed Subwoofer Box Design Calculator
Car Audio - Home Theater Sound System

AJ Sealed Designer calculates the required sealed/closed enclosure parameters for woofers and subwoofers.

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

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driver resonance frequency
system response maximum dip or peak
frequency where the 3 decibel power drop occurs
net enclosure volume(internal)
system response maximum dip or peak


Vas air volume equal equal to compliance of driver suspension
Qts total driver Q at fs
fs driver resonance frequency
Qtc total system Q at fc
Vb net enclosure volume(internal)
f3 frequency where the 3 decibel power drop occurs
fb box resonance frequency
dbpeak system response maximum dip or peak

Input Parameters

1) Theile Small parameters are required for input. These values can be found in the speaker's manual or on the manufacture's web site.
2) For Qtc, choose a value between 0.1 and 2.0. A value between 0.5 and 1.2 gives the best results. Try varying this parameter to see how the size of the box and the frequency response can be changed.
  Theile/Small Parameters  
Vas  liters
Qts  unitless
fs  Hz
  User Defined Parameter  
Qtc  unitless

Calculated Values

1) f3 is the most meaningful parameter. The lower the f3 parameter the deeper the bass will sound. An f3 below 50 Hz is suitable for a sealed enclosure. An value below of 40 hz gives the best results.
2) Vb is the net size (volume) of the enclosure to be built. Generally, the lower the bass the larger the box.
3) In the frequency response plot, the output SPL, sound pressure level, is based at 1 watt/meter

Vb  =  58.369750479846  liters
f3  =  49.626591140227  Hz
fb  =  49.122807017544  Hz
dbpeak  =  0.0018091834542131  db

frequency graph

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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