back loaded horns have no brand tagging ?? no idea who made them  I am 3rd owner and only mod was to swap out the 206's for enabled 2o6's.....small stable of tube amps Jeff Larsen, Jeremy Fix, Dennis Had, Steve Decker, Grommes PHI -26 and my Radio craftsman C-500 mono blocks.....all rotate into use ....  major improvement acoustic panels   WOW!  Now I can really heard my system!!