Head-related sound reproduction devices vary in transducers characteristics, the acoustic basic principle like open / closed / circum- or supra-aural systems. Furthermore the transducers de-/centred placement inside the earcup influences the tone quality. These headphone techniques were evaluated thousand times in comparison meanwhile. One creation with a spatial reproduction of sound was much more conspicuous statistically, because of a higher quantity recommended sound quality judgements as "to much" and "less high frequency range" parallely. This forced investigations to find the reason of those strange review accumulations. Four different headphone types were measured via seven testing persons by probe microphones in the auditory cannel. The research result shows an electro-acoustic cause for perceived tone coloration's of headphones by in the transducer positioning and the human pinna filtering efficiency.
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