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Well, if you have the time and some rudimentary equipment, you can measure the Thiele – Small parameters without a DATS. The place I remember best is Elliot Sound Products. Give that a read and see if you think you could do that.
Another way I used to do initial design was to use cardboard mock-ups, start with just 1 layer of corrugated, see how it sounds, and adjust the box size by sliding the back in or out to change the volume. It works well enough when you are just getting started or have no information on a driver.
Reply To: RE: Enclosure design to re-use 2.25" Bose SoundDock drivers