Frogman & Tubegroover, thanks for your comments. Yes, I recall the saga of the Fourier Systems speakers quite well.
In fact I auditioned the substantially redesigned second version of the Fourier I at Lyric's White Plains store in 1983, as I was shopping for speakers at the time. In Aczel's own words (Issue 10, published in 1987 following the long hiatus), the redesign addressed "some driver-related problems that had eluded our attention in the laboratory, [which] made its interface with certain rooms unpredictable." Shortly after the release of the initial version a generally negative review in "The Sensible Sound" (not exactly the most hyper-critical of audio review publications) had cited a "silvery spacey effect" created by its subsequently replaced tweeter. The mid-range driver was also replaced in the redesign.
The version I heard sounded generally ok during my fairly brief audition, but left me unexcited.
Aczel's lengthy recounting in Issue 10 of the Fourier saga and his involvement in the company is persuasively written, as might be expected, and if taken at face value would dispel any cynicism about it all. But who knows?
One thing is certain. Both the timing and the degree of his ideological metamorphosis were striking, and, as you indicated, fascinating and mysterious.
Best regards,
-- Al