Examination of published blind listening tests reveal that listeners are strongly disposed to report differences in sound quality when given two alternatives that are identical. The tendency was found in every published test over the past 15 years where analysis was possible and ignorance of the effect caused some tests to be improperly designed or analyzed. The author conducted an extensive single blind listening response bias and it's relationship to order of presentation, listener expectations and the presence of loudness differentials. The findings lead directly to suggestions for consumer purchase behavior and scientific listening test design and analysis.
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