John, note that specs and graph in the "Guru" review are taken from the Axiom site, and are those which have appeared for several years. The response below about 80Hz in the anechoic chambers isn't accurate because of the size of the wedges, and small differences in the curve there are meaningless(one of the reasons for measuring up on the tower). There's no indication that any significant change in the M2 mid-woofer or the enclosure bass tuning was made.

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Enjoy the music, not the equipment.