The design and development of loudspeaker systems requires an anechoic room and much associated instrumentation to establish relative objective data and substantiate subjective results. Similar instrumentation for production testing of components and systems is described, which is not as accurate on an absolute scale but which requires less operation time and is more mobile. The correlation and calibration between laboratory and factory testing facilities is discussed.
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https://aes2.org/publications/elibrary-page/?id=1516
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