A new scheme consists of measurement by wide range HATS, and the free-field HRTF correction was proposed to enable entire frequency response measurement from audible frequency and higher frequency area up to 140 kHz and for direct comparison with free field loud speaker frequency response. This report supplements the previous report [N. Tsunoda et al., “A Headphone Measurement System for Audible Frequency and Beyond 20kHz,” AES Convention 139, October 2015, convention paper 9375] that described system concept by adding ear simulator detail and tips to obtain reliable data with much improved reproducibility.
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