Polar measurements of harmonic and multitone distortion of direct radiating and horn loaded transducers

While extensive literature is available on the topic of polar pattern measurements and predictions of loudspeakers fundamental SPL, only a single paper to our knowledge deals with the polar pattern of nonlinear distortions, in particular with harmonic distortion products of cone type loudspeakers. This paper contains the first results of a more thorough study intended as a complement to fill the gap both in measurement techniques and loudspeakers type. Relative and absolute harmonic distortion as well as relative and absolute multitone distortion indeed have been measured for cone, dome and horn loaded transducers.