I’m an old timer having purchased my U-790s (originally U-1PX) in 2005. The line has certainly grown since then! That makes sense that the 90 degree model requires a wider cell structure. Years ago, I visited the Utah facility and watched Brett do some assembly. I had previous met Roger and Connie at a Chicago Audio Society meeting when the M945 was introduced.
My backplates are currently in Gunnison for some minor repair and the bypassing of HF control with Ohmite resistors. I also asked about bypassing the mid control since I never change from flat.
What got me started was hearing Dayton-Wright XG-8s at former TAS reviewer JWC’s in 1976 and instantly became an enthusiast. Also use Acoustat 1+1s in the home theatre system.
Regards,
Ralph