i know that you're a member of the A.E.S.,everything you wrote about listening tests for the purpose of assesment of louspeaker to find which kind of measurements had true correlation with
the subjective human perception of sound made a lot of sense,i gues that you use good ancillary electronis to drive the speakers...
Knew that M had to be an electrostat before I read the text :)
It would be interesting to drive a conventional loudspeaker system with a preceding EQ that simulated the M frequency response. Although this wouldn't help/hinder the directionality issues, I wonder if some listeners wouldn't key into the response and start raving about "transparency that only comes with small moving masses" etc.?