My father in law has a pair of Olympus c50s that have 2 15 inch drivers not a passive radiator. Was this an option or did he modify these? With those extra magnets these weigh in at 200 lbs each. All that I have read on this forum seems to indicate that the passive radiator is stock. Anyone ever see these with twin drivers. They seem to be stock otherwise for a 8r setup. According to my wife these have been his since he bought them in the late 60s. He is 91 so can't get much from him. Will likely sell these on eBay so trying to determine if they are unique. They sound great. He has the matching Delphi cabinet too.