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Phase Distortion in Headphones

Dear List,

I was wondering if anyone had access to or was aware of phase distortion
characteristics in commercial headphones.  It seems that headphone
manufacturers are not in the practice of gathering such info or at least
not in the practice of sharing it with consumers (although they do provide
harmonic distortion characteristics).

Alternatively, I would be interested in any suggestion regarding standards
in assessment of phase distortion.  I'm familiar with the callibration
technique of comparing a square-wave recorded at output to the original
pre-processed signal, but I'm not sure about how one would quantify amount
of phase distortion between the two signals.  Any suggestion would be most


Frank A. Russo
Acoustics Lab, Department of Psychology
Queen's University, Kingston, ON, K7L 3N6, Canada
phone:  613-533-2490     fax:  613-533-2499