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vented ported subwoofer box calculator

Subwoofer Box Comparison Calculator:
Online version of all three calculators (Bandpass, Sealed and Vented)

Bandpass Designer is freeware. Download Here.
Sealed Designer is freeware. Download Here.
Vented Designer is freeware. Download Here.


Vented Box Calculator determines the internal dimensions for a sealed speaker enclosure.  It can solve the box dimensions in both unconstrained (Golden Ratio) and constrained modes.

Notes Before Using Box Calculator

One of the faces of the enclosure will need to have enough surface area so the speaker and ports (vented and bandpass) can be installed.  For example, a 15" driver will not fit in an area (Width X Length) of 10" X 10".  The speaker's diameter  is too large.  Dimensions will need to be constrained to make the driver/ports fit into the box.
When designing a vented or bandpass enclosure note the length of the port.  Port length can become too long when using large diameter ports.  For example, a 24" port will not fit into a 10"X10"X10" box.  It will stick out of one of the sides. If this occurs, constrain dimensions.
Try not to place the speaker on the very edge of the enclosure.  If possible, keep the speaker and ports three to four inches away from the edges and walls.
In summary, plan where you are going to place your speakers and ports.  It's no fun to find out three hours into a building a box that your speaker will not fit.

Unconstrained Dimensions

The Unconstrained mode determines the optimum dimensions (length, width, and depth) for a particular volume.  The optimum volume is also known as the Golden Ratio.  The Golden Ratio reduces or cancels out the standing waves inside an enclosure which improves sound quality and reduces distortion.  Not all enclosures can be constructed to the Golden Ratio because of speaker/driver dimensions or vehicle room (see the Constrained Section below).
vented subwoofer box calculator


Vb:  Box volume
Addl. V:  Additional volume
Port Volume:  Port volume
Total Volume:  Volume of the box, port and additional volume added together.  Determined when the Calculate button is pressed.
Length:  Length dimension
Width:  Width dimension
Depth:  Depth dimension


Determine the volume of the box
Select Box Calculator from the Box Calculator menu
By default, The Golden Ratio dimensions will be calculated.  Note how box and port volumes from the previous screen are transferred to the Box Calculator screen
Enter any additional volume.  Additional volume will include any space taken up by the speaker structure, braces, or anything else that takes up space in the enclosure
Ensure all the Constrain check boxes are not selected
Click the Calculate button to determine the dimensions.

Constrained Dimensions

Checking the Constrain check box next to a dimension will set or hold dimensions to a set value.  The unconstrained dimensions will be calculated.  When constraining one value, the other two dimensions will be calculated as close to the golden ratio as possible.  When constraining two values, the other dimension will be calculated without regard to the Golden ratio.


Determine the volume of the box
Select Box Calculator from the Box Calculator menu
Enter additional volume value.  Additional volume will include any space taken up by the speaker structure, braces, or anything else that takes up space in the enclosure
Select dimensions to constrain.
Enter new values for the constrained values.  If a dimension is constrained, a new values should be entered
Click the calculate button to determine the unconstrained dimensions.

 Subwoofer Main

 Free Download
  Bandpass Designer
  Sealed Designer
  Vented Designer
 Box Calculator

Subwoofer Box Software Downloads for Sealed, Ported and Bandpass
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