Principal axis
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3-1-135
Principal axis (of a sound source or receiver)
Generally the axis of structural symmetry or the direction of maximum emission or response.
Reference direction serving as an origin for angular co-ordinates used in describing the directional characteristics of the sound source or receiver.
Reference: I.E.C. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
