The complex radiation pattern generated by distributed mode loudspeakers makes a single-point measurement an inadequate representation of the sound field. In this paper we discuss simple multiple-point measurements as appropriate characterization tools. These techniques are used to determine the total power, together with its directivity, and are equally applicable to both distributed mode and conventional cone loudspeakers.
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https://aes2.org/publications/elibrary-page/?id=8210
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