This paper investigates the repeatability of an HRTF evaluation protocol, assessing the spatial quality of binaural stimuli, moving along pre-defined trajectories on the horizontal and median planes, on a forced-choice 9-point rating scale. The protocol assessment was based on data simulations and subjective studies. Repeatability was evaluated as a function of the size and content of the HRTF corpus, the trajectories, and the resolution of the rating scale. Analysis of the data revealed that HRTF rating is a reliable, yet challenging task with low repeatability rates of [about] 50%. Therefore participant screening through pre-tests should be used to maximize reliability of the responses.
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