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Factors Affecting Accuracy of Loudspeaker Measurements for Computational Predictions
The delay of a signal from the input terminals of a loudspeaker amplifier to the output terminals of a microphone can be represented as two parts, one from the electrical input to acoustical transmission, and an acoustical propagation delay from some point on the loudspeaker to the microphone. For computational models of mixtures of loudspeakers to be correct, these delays must be measured accurately. It will be shown that temperature differences as small as 1 degree Celsius between measurements of two models of loudspeaker can cause significant differences in the predicted sound field. Though sound speed is much less sensitive to changes in humidity, the difference between assuming a typical humidity and assuming zero humidity (which is the norm) can be significant.
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