I am curious about your line array and whether you ran into problems with beaming. Back in the 1970s when I had a RTR ESR-6 with my Fulton FMI-80s, I tried making a new mounting panel so that all 6 electrostat panels were in the same plane. The resulting sound was much too beamy and bright. It turned out the RTR knew what they were doing when they angled each of the panels to get a broad dispersion pattern with tolerable beaming on each one. Your line array wouldn't have quite the same issues as mine since the panels are spread out vertically. You probably don't have as much concentrated HF energy on axis as I did, but what about horizontal dispersion? Does the treble balance fall off considerably if you listen off-axis?
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