At the dawn of the stereo age I had older friends who already had extremely capable mono systems. It was called High Fidelity. Fisher, Scott, Marantz, McIntosh… maybe a Klipsch corner horn. Typically RTR tape as the source. Some of these systems were incredibly good for the day.As far as 3 channel, what I have heard was impressive and better than stereo IMHO
Rob
When stereo came along, many were angry and complained that it was not better, and that it was a ruse to force you to buy a second amp, stereo preamp, another speaker, and a stereo RTR tape machine.
I suspect that three channel would have been met with even greater resistance.