Jim, what I was going to use as a little bit of audio humor if someone had followed up on my "small" comment is apparently not too far from what you actually have in mind. I was going to protest that the reference was merely to Richard Small of the Thiele-Small parameters and that you were interested in enclosure tuning. As chess indicated, I don't really believe that making use of the parameters can be done to give you the accurate timbre comparison that you're looking for.

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Enjoy the music, not the equipment.