Well, so many ideas come to mind. First was the hysterical laughing fit we had in my shop when we finally got around to hooking up a pair of these (1974). I still remember my tummy hurting from laughing so much. I think we actually fell on the floor and rolled around--we were young in those days.
I had never heard them before and we were going around the room hooking up one pair of speakers at a time for my "education" since, at that age, I "knew everything" of course. I thought we had them hooked up wrong or something. NOTHING could sound that bad, especially from a company who's print ads featured very tall young guys dressed in white lab coats with Buddy Holley glasses and clipboards. Naw, they were just as bad as they sounded.
Funny, I had a couple of old Mac 275's (I think--long time ago) but we did not hook them up as we were using all Audio Research stuff for this education session.
Whew--funny even now. But hey, the ads were wonderful, no?
Cheers!