Blauert, J. and Laws, P "Group Delay Distortions in Electroacoustical Systems"
Journal of the Acoustical Society of America
Volume 63, Number 5, pp. 1478-1483 (May 1978) Blauert and Laws report approximately the following thresholds for audibility:
Frequency Threshold of Audibility 8 kHz 2 msec 4 kHz 1.5 msec 2 kHz 1 msec 1 kHz 2 msec 500 Hz 3.2 msec
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