Steve F included some comments with his contributions of the individual ADD models brochures:
"Here is the AR "Advanced Development Division" Lit that they handed out when I attended the famous live vs. recorded demo with drummer Neil Grover at the AR factory in 1976. The 10pi did a remarkable job in fooling the group into thinking the recording was the live sound. And these were experienced BAS listeners! Quite a speaker, by any standards."
For reference, BAS = Boston Audio Society.