The internal resonator banjo, patented and first sold by Fred Bacon around
1906, remains something of a cult favorite and is still produced by some
independent luthiers. According to enthusiasts, the characteristic design
elements produce a sound that is mellower, richer, and of greater complexity
and presence than without them. Aspects of that sound are studied here,
comparing instruments that are otherwise identical and identifying physics
mechanisms that are likely responsible.Comment: 24 pages, 21 figures, 3 linked mp3 sound file
