Jukebox extension speakers.
Seriously, the Seeburg DDS1 would have to be improved dramatically to even be considered an inadequate disco speaker.
Search the name Richard Long, he designed many of the notable disco systems here in the Northeast back in the day. He was a big proponent of the 4520 double scoop and 2395 slant plate horn..................... probably my favorite vintage JBL combination.
EDIT: Had to go dig thru some old jukebox books so i could get the models right. The DDS1 was designed to be a cosmetic match for the Fleetwood, Electra, Mustang, and Discotheque Jr jukeboxes from Seeburg's "Discotheque" series. If you search out any of these models from 1962-68/69, you'll see that they use the same grill materials, trim, heavy cabinetry, and ugly as sin formica covering as the DDS1 extension speakers.
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