An experiment has been conducted to determine whether the speech intelligibility in rooms is related in a simple way to the loudspeaker directivity Q. three loudspeakers of widely differing Q were used to subjectively test intelligibility in five auditoria. These results indicate that intelligibility and Q are not directly related. In addition, impulse response measurements were made so that several methods of predicting intelligibility could be compared with subjective scores. One method, which assumes a linear relationship between Q and intelligibility, was shown to be the least accurate predictor. Two other methods, one based on the psychophysics of the auditory system and the other based on the modulation transfer function, proved to be better predictors of intelligibility.
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