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I had seen these at CES so did not spend much time on them at AXPONA. They are supposed to suppress the rocking action of the speaker backward as it plays. There was no before/after test (then or now).
Oh wait... Maybe that is what they had set up and the hand written sign was about! Wonder if anyone else heard the comparison if indeed it was performed.
I heard the demo last year, the two guys I was with were impressed. They were covering the show for HTS, I couldn't tell the difference. I must have ears of stone or is it lead?