Tom SpeakerLab

That is an Speakerlab commercial ‘super’ 7 from the early days (nicknamed the Super 7 before that name was ever used officially). They were built mostly for clubs and venues like the Pacific Science Center Laserium, and were always at least bi-amped (and most often externally crossed over) because the efficiencies of the woofer section (from a 7) and the mid/tweet section (from a K) didn’t match. I have seen one fully passive set, they had a bunch of resistors on the mid/tweet board. -Tom (speakerlab.net)