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Head related impulse response measurements with the KEMAR dummy head performed in an anechoic chamber with a resolution of 1°. The impulse responses are provided for different distances and are accompanied by headphone compensation filters. For details have a look at README.md. The same measurement can be downloaded as MAT files at https://doi.org/10.5281/zenodo.4459911 This dataset is further described in (see the PDF file) H. Wierstorf, M. Geier, A. Raake, S. Spors - A Free Database of Head-Related Impulse Response Measurements in the Horizontal Plane with Multiple Distances. In 130th AES Conv. 2011, eBrief 6.
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Wierstorf et al. (2016) studied this question.