Music Term: Dispersion/dispersion angle
Definition and background:
The angle of effective coverage for sound radiated from a loudspeaker, defined as the included angle bounded by the points at which the loudspeaker's SPL level drops six decibels from its on-axis response. Loudspeaker specifications will provide two components, horizontal dispersional angle, and vertical dispersion angle. Similar to "Polar Pattern."
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Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary