Far-field array behavior depends on assuming the observation distance is effectively infinite

Evidence

This corresponds to the radiated sound from an array of speakers, and the amplitudes represent the illumination of the surface. If we are an infinite, or at least very large, distance away, we can make the following approximations: 1. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2863

Categorization

• DEFINE: Introduced as the setup for the far-field assumptions; names the speaker-array analogy that makes the abstraction concrete.