Directional gain

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3-1 -150

Directional gain (of a sound source, in decibels)

Alternative term: Directivity index (of a sound source, in decibels)

Ten times the logarithm to the base 10 of the directivity factor.

Reference: I.E.C. (modified)

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)