When I opened my shop in 1974, I had Audio Research and Magneplaners there. After listening to them, I then put every other speaker we sold (about 16 different high-end brands) on the same electronics and some others (McIntosh, Phase Linear, Crown, etc.)
I learned that ALL boxes and horns and electrostat's distorted the recorded music. Only the Maggies did not.
And, while the other electronics were OK, they were not as accurate as those from Audio Research, even on boxes and electrostat's.
Eye-opening time that helped me continue to educate myself so I could bring the best possible (most accurate) products to our customers.
Not much has changed, although some boxes are getting better, and some electronics are much improved. Still, Maggies are the most accurate when set up properly with the best electronics.
Cheers!