The best ever JBL speaker system in my opinion would be two Hartsfield's
with a Paragon for the center speaker.

Frank Sinatra had such a system. There were several other motion picture stars with such systems, Richard Boone was seen in an old audio book
removing his 375 horn lens from one of his Hartsfields with the other Hartsfield
and a Paragon in the background.

The problem of course was space , a room large enough to accommodate
such a system.
Here in St.louis there was man with four Hartsfield in his basement , they were overwhelming.

The Harsfield were very expensive to build , there was a change in design about 1957 to reduce cost. The Paragon was also expensive to build.
Music has changed and with stereo and the cheap transistor audio will never be the same .