Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed

[53Sparky]

There are other ways to affect the way a bass reflex enclosure is tuned that is not directly related to volume. By varying the amount of polyfill that you use within the box, you can simulate a larger enclosure and achieve performance results that match a larger box with less fill.

In other words, while there is absolutely a precision level of science to all of this, which SkinnyG has so proficiently demonstrated, you also have some wiggle room with the size of your enclosure which complements the science with duct tape and bandaids.