I have a full page ad from The Saturday Evening Post dated 1937. STROMBERG-CARLSON. The ad show,s a large floor standing console radio plus a cutaway of the speaker chamber. It show,s a ACOUSTICAL LABYRINTH like the BOSE. But on a larger scale. This was 1937. The cost of this floor standing radio was $197.50. The ad states-- The long passageway of the Acoustical Labyrinth takes the place of the usual box like cavity in the cabinet which is the source of the exaggerated boom in low tones. It gives you deeper bass notes, with a new fidelity and increases the volume capacity and accuracy of the loud speaker.-- This was 1937. Now I wonder where BOSE got his idea.