Enter your enclosure type, wood thickness, and box dimensions (width, height, and depth) to calculate the internal air volume your subwoofer will actually see — along with external volume, wood volume, and your result in liters for wedge or standard builds.
Internal Air Volume
--
External Volume
--
Wood Volume
--
Volume (Liters)
--
Internal volume is the air space inside the box available for the subwoofer, while external volume includes the wood material. Internal volume is what matters for subwoofer performance and specifications.
Thicker wood reduces internal air space. The calculator subtracts the wood volume from the external dimensions to give you the actual internal volume. Typical MDF thicknesses are 1/2", 3/4", or 1".
Rectangular boxes are easiest to build and most common. Wedge enclosures save space in tight installations. Cylindrical enclosures can be stronger but are harder to construct. Check your subwoofer's specifications for recommended volume.
Check the manufacturer's specifications for recommended enclosure volume, usually listed as Vb (box volume). This is typically given in cubic feet for sealed boxes or cubic feet plus port tuning for ported boxes.
Yes, but remember that ports take up internal volume. Calculate the port volume separately and subtract it from the total internal volume to get the net air space available to the subwoofer.
Adjust your box dimensions proportionally. If you need more volume, increase all dimensions slightly. If you need less volume, reduce dimensions or add internal bracing to take up space.
Yes, subtract the subwoofer's displacement volume (Vd) from your calculated internal volume. This information is usually provided in the subwoofer specifications, typically 0.05-0.15 ft³ for most car audio subs.