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bandpass 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.


Bandpass Box Calculator determines the front and rear chamber enclosure depth using entered width and length values.

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.
bandpass subwoofer box calculator



Front chamber volume
Rear chamber volume
Port Volume: 
Port volume
Addl. Vf: 
Additional volume for the front chamber
Addl. Vr: 
Additional volume for the rear chamber
Total Volume: 
Volume of the front chamber, rear chamber, port and additional volumes added together.  This will be determined when the Calculate button is pressed.
Total Vf: 
Volume of the front chamber and additional front chamber values
Total Vr: 
Volume of the rear chamber and additional rear chamber values
Length dimension
Width dimension
Front Depth: 
Front chamber depth dimension
Rear Depth: 
Rear chamber depth dimension


Length and width are user defined parameters.  These values will need to be entered by the user to accommodate the speaker and port.  The Calculator will use these values with the volumes of the front and rear chambers to determine the front and rear depths.

Determine the volume of the box
Select Box Calculator from the Box Calculator menu. Note how front chamber, rear chamber, 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
Set the length and width dimension the fit the speaker and port
Click the Calculate button to determine the 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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