$15,000 Speaker Does Not List Freq Response Specs

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The super-tweeter used in the demo was the Enigma Acoustics.

Enigma Acoustics Supertweeter
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Mitch, thanks for the clarification. I tend to agree the dealer appears to be hawking those electrostatic tweeters.

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Robert E. Greene of The Absolute Sound was also in attendance at the demo. He played a live violin solo along with a violin recording played with the speakers.
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Yes, I spoke to someone who was also there. His experience was very different than yours but he was up front near the center.

To expand on what has already been said "unless you're listening in an anechoic chamber, aneechoic measurements are useless" is spot on. No audiophile has an anechoic chamber.

How a speaker controls itself independently of the room is a much more valid measurement- this can be observed by polar patterns and how the dispersion is controlled across the frequency range.