To calculate the port area, we need height and width dimensions. If you’re looking for extreme tuning, you may have to manipulate this to come up with a box design that’s physically possible. This figure is a good guideline for most applications. You will need 16 square inches of port area per cubic foot of net volume. 82 = 2.788 ft.3 of net volume CALCULATING PORT AREA Remove the 18% from the gross volume: 100% – 18% = 82% or. Net volume is the figure you’ll need to use when determining box size and tuning. Next you’ll need to subtract this 18% to get your net volume. That 18% no longer contains air to feed your woofer(s). The sub and port take up about 18% of that volume. The total available volume you just calculated is the box’s gross volume. = 5890.625 in.3Ĭonvert the volume from cubic inches to cubic feet: 5890.625 ÷ 1728 = 3.4 ft.3 CALCULATING NET VOLUME x 12.5 in.Ĭalculate internal volume in cubic inches: 14.5 in. Internal volume in ft3 = (Internal volume in in3) ÷ 1728 EXAMPLE:īelow is an example of how to calculate volume for a box built from ¾” thick material with dimensions of 16″ by 34″ by 14″.įirst, subtract the ¾” wood thickness: Internal dimensions = 14.5 in. Internal volume in cubic inches = (height x width x depth)Ĭonvert the volume from cubic inches to cubic feet: Multiply length, width, and height in inches: Subtract material thickness from the external measurements: You can also use free tools like SketchUp or Fusion360 to create and modify a 3D model of your enclosure. If you’re an artistic sort, sketch out your box and write the dimensions next to where you measured them. HOW TO CALCULATE BOX VOLUMEįirst measure the external length, width, and height in inches, and write them down. If you’re designing a box for a specific space, you can keep changing dimensions and calculating the box volume until you find the ideal box size and shape for your application. You’ll need a tape measure, a pencil and paper, and a calculator. This calculator is only intended to design a speaker box with the correct proportions in an easy to build shape.Calculating box volume requires simple math and knowing generally what you want from your system. Then click the button again to calculate another time.ĭue to rounding, the total number shown above will come out smaller than the value you entered. You won't need to re-enter all the values to re-calculate, you can change only one or as many as you desire. Then click the "Box Volume" button to see the volume obtained from these dimensions. To use this calculator, add a little bit to the dimensions from the calculator above. This calculator is only intended to give you some "ballpark" figures to use in the calculator below. Then click the "Dimensions" button to see the proper internal dimensions for your new speaker box design.ĭue to rounding, the total number shown above will come out smaller than the value you entered. To use this calculator, enter the volume of your enclosure (in cubic feet) in the first box. Never build a cube shaped box, which is the absolute worst enemy of a smooth frequency response curve. To determine an enclosure shape that will help to minimize standing waves in the familiar rectangular speaker box. There are some ratios which are typically used Subwoofer Box Dimension Calculator This page is designed to help you determine the proper dimensions for a speaker enclosure.
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