Preferences vs compromises
I bought new a pair of Acoustat X speakers (Direct coupled tube amps and good sounding but amps were unreliable) and then later I acquired a pair of Acoustat Model 4s (four panels per, in a flat plane.
A few years ago I hooked them up and there was hum emanating from them (after they sat unused for awhile). I sent the transformers for rebuild to Roy Esposito in FL and the speakers have worked and they sound excellent.
For what I could sell them for (and my preferences in an audio playback system} I am convinced that I could not find a better sounding speaker for five times that amount.
As a point of reference, I own two pairs of Sound Lab speakers. with both pairs having the latest speaker and backplate upgrades.