A new family of rotary loudspeaker transducers

A technical overview will be provided for a new electromagnetic transducer concept that employs rotary motion rather than rectilinear piston motion. The differences in the physical rules that govern the distribution of force and mass in the rotary and rectilinear systems will be explored. These relationships have permitted the construction of a new category of transducer which offers solutions to some of the seemingly insurmountable design constraints inherent in conventional coil/cone driver systems. One of the transducers examined is a high‐output, full‐range (40 Hz to 20 kHz) rotary loudspeaker which produces low‐distortion, minimum‐phase acoustic output with a radiation pattern resembling that of a line source.