I once had a conversation with another ham operator who was located in Tasmania. He was an elderly fellow who said that his career had been in the motion picture business and that he had recreated a complete historic movie theater at his home. He claimed to own a vintage Edison projector S/N 2 or something like that.
For his "talkie" equipment he had a pair of huge horns that he said would fill a theater with a few of watts of drive. To obtain one of these he had driven (after sailing to the mainland) all the way to Perth to bring it back.