This paper presents a general metatheory (theory of theories) of directional sound localization suited to the design of directional sound reproduction systems using loudspeakers. It is shown that any theory of localization can be expressed as a composite of -primitive- component theories based on three hierarchies: degree of nonlinearity, order of spherical-harmonic directionality, and degree of use of head movement. These component primitive theories are mathematically tractable for design purposes. An appendix illustrates applications of the metatheory to previous models for stereo localization.
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