Subwoofer Main
Free Downloads (Windows):
Bandpass Designer Sealed Designer Vented Designer
Bandpass Sealed Vented Example
Box Calculator (Windows):
Bandpass Sealed Vented

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

Bandpass Box Calculator

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


  • Vf: Front chamber volume
  • Vr: 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: Length dimension
  • Width: 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.

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