Our above box, 13H x 32W x 10D would need 1.5″ taken out per dimension, leaving 11.5H x 30.5W x 8.5D, representing the dimensions of the airspace residing in the enclosure. We now multiply, 11.5″ x 30.5″ x 8.5″ = 2,981.375, to come up with cubic inches. Step 2.2: Get help for the Speaker Box Designer. Determine the Dimensions of your Speaker Box based on the Calculated Volume. Determine if your Driver works best in a Sealed or Ported Enclosure. Calculate the Displacement Volume for Your Driver. Read the Speaker Box Design Tutorial. The choice of box type will ultimately determine the dimensions of your speaker box. As observed, here are the typical box dimensions for each type: Table: Typical Speaker Box Dimensions You simply measure the height, width and depth (in inches), multiply them together and then divide that number by 1728. If the box has internal measurements of 6" high*18" wide*12" deep then the volume of the box is 1296/1728=.75 ft^3. The diagram below shows how you would measure the dimensions of the box. The speaker box should be constructed from Medium Density Fiberboard (MDF). See the MDF Board FAQ for more information on obtaining and using MDF, along with safety issues. You should use minimum 3/4" MDF which is sold in 4x8 sheets. You will probably need 2 sheets. This can cost up to $40 a sheet, but it is worth it. Make a subwoofer enclosure plan. Calculate a speaker box volume, port length and other parameters without getting confused in formulas. 8 inch Subwoofer Box | Ported | Pipe on the Right Panel 10 inch Subwoofer Box | Ported | Pipe on the Right Panel 12 inch Subwoofer Box | Ported | Pipe on the Right Panel PAXV.

12 inch speaker box dimensions