- The value in dB of ten times the common logarithm of the directivity factor. The directivity factor is the ratio of the sound intensity produced by a test transducer on a specific axis to that of a point source that is putting out the same acoustic power. Since the specific axis is usually one of maximum radiation, the DI in usually greater than zero.
- The difference between sound pressure level in any given direction in the acoustic far field and the average sound pressure level in that field. Source: http://www.owenscorning.com/around/sound/glossary.asp
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