How to Get Proper Enclosure Box Measurments?

To calculate volume, multiply length x width x height. The recommended enclosure volumes are included in the specs you listed.

Example: Lets say you have a particular space that is 30 x 16 inches in area in your vehicle where you'd like to place the enclosure that should be between 1.25 and 1.625 cu. ft. I'll use 1.5 cu. ft as a target volume for a sealed enclosure in this example and start by dividing 1.5 cu. ft. (or  2586 cu. inches) by (30 inches minus the thickness of material (both sides)). 2586/(30-1.5) = 90.736842105263157894736842105263.

Now divide 90.736842105263157894736842105263 by (16 minus the thickness of material (both sides)) to calculate how high you have to make it to be 1.5 cu. ft. in volume. 90.736842105263157894736842105263/(16-1.5) = 6.2577132486388384754990925589837.

So you're final external dimensions would be 30" x 16" x 6.29" for a 1.5 cu. ft. enclosure made of 3/4" material that will fit in the desired location in your vehicle.

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Hi Signal, I used those specs in my example to fit into a desired location. There is no absolute starting dimension for a box. You will have to start with a desired dimension of your own as I did in my example. The location in which you want to place this box should give you that starting point/dimension.

If you are not trying to build a box to fit into a particular space and only want to build a 1.5 cu. ft. square box made of 3/4" material, the box's outside measurements would be: 15.25" x 15.25" x 15.25" (1.5044 cubic feet)  To convert cubic inches into cubic feet, divide by 1728 and always remember to subtract the thickness of material to get your interior volume.

https://www.the12volt.com/caraudio/boxcalcs.asp#rec 

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