@nicolelynn_94115: Oh man, I forgot about the FMI 80! Talk about value!! I didn’t have the 80, but I had Robert Fulton’s Model J, which employed the 80 as it’s midrange reproducer. For highs it was the RTR ESL tweeter box (containing 6 ESL tweeters, the same ones David Wilson used in his original WAMM), for lows a transmissionline-loaded dynamic woofer. I don’t remember the price of the 80 (something like $200?) but in 1974 the Model J was priced at $1200/pr, itself good value
By the way, Robert Fulton was also an excellent recording engineer. His ARK label LP's feature fantastic recorded sound, with superb inner detail and natural timbres. His recordings are exclusively of local Minnesota choirs and church organists, good ones.