The design and development of loudspeaker systems requires an anechoic room and much associated instrumentation to establish relative objective data and to substantiate subjective results. Similar instrumentation is employed for production testing of components and systems which is not as accurate on an absolute scale, but which requires less operation time and is more mobile. The need arises for a system of correlation and calibration between laboratory and factory to allow for these differences while retaining sufficient accuracy to guarantee the desired quality level of the product.
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