Eldartford, ""Sealed box" they may be, but not truly acoustic suspension." Agreed. That was the point of my initial post.
"A true "acoustic suspension" speaker system involves a woofer with a free air resonance of about 15 Hz." Disagree. A woofer designed to be used in an Acoustic Suspension alignment is not dependent on free air resonance, but the other parameters you and Rodman99999 have been discussing, along with a powerful motor structure. For example, it would be difficult to find an 8" or 10" woofer with an Fs of 15 Hz, yet a properly designed driver of this size could serve the intended AS purpose well.
Incidentally, Villchur's first designs used the silky material taken from the outside of mattresses, as he considered it the best thing he could get his hands on to implement his theories. Even though he felt it was crude, things worked out beautifully, and as they say, the rest was history.