In our laboratory, we conducted auditory experiments to examine elevation localization by changing frequency spectra without using HRTFs. As a result, we achieved elevation localization at (azimuth, elevation) = (0, 0), (0, 30), (0, 60) by two loudspeakers arranged just beside the listener. However, it was only investigated with fixed distance between the ear and the loudspeaker to be 70 cm. When distance was not 70 cm, the elevation perception was unidentified. Therefore, the arrangement of loudspeakers was changed in this research to improve the result. As a result, the rate of in-the-head localization was increased, and the distance of the perceived sound image became shorter and shorter.
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