Hi bdp24
It looks like you're asking about a couple of topics here. High Mass/ Low Mass and Variable/ Fixed tuning.
"Question: What makes any of the above loudspeakers "high mass"? In what sense? The drivers in ESL and magnetic-planar loudspeakers, and the driver's support structures, are lower in mass than the dynamic drivers and their "tunable" enclosures, are they not? So are the excellent Vandersteen Balsa Wood-structure drivers, and the "enclosures" they are mounted in."
and
""Tune" a loudspeaker to do what? Allow more resonance? Great idea! Musical instruments are tunable for a very good reason---they play notes. The notes are either correct (in tune), or they are not (out of tune). A loudspeaker cannot be "tuned" to achieve an isolated, desired effect, unless the loudspeaker was designed without a target objective. Is reproduced sound now suddenly a purely subjective matter? "Tune" a loudspeaker to play a certain recording "better"? And retune it for another recording?"
If you wish to step outside of your BS slogan mode, I'm sure you'll find Tunees willing to share with you here. Would that be of interest?
MG