Experience from many years of double-blind listening tests of audio equipment is summarized. The results are generally consistent with threshold estimates from psychoacoustic literature, that is, listeners often fail to prove they can hear a difference after non-controlled listening suggested that there was one. However, the fantasy of audible differences continues despite the fact of audibility thresholds.
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https://aes2.org/publications/elibrary-page/?id=5549
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