Miniature Loudspeakers for Personal Radio Receivers

Abstract

This paper presents two small experimental loudspeakers of the same general design, suitable for use in personal radio receivers. The design of the magnetic structure is unconventional in that the loudspeaker cone housing and the magnet occupy the same space, and the over-all loudspeaker depth is thereby reduced. The vibrating system of the loudspeaker is conventional so that the directional characteristics, distortion, and frequency response are, in general, similar to a completely conventional loudspeaker of the same diameter. Some general design considerations applicable to this type loudspeaker are discussed, together with a chart summarizing these design considerations.