mat@hou5d.UUCP (11/21/83)
Cementing my reputation as a Hirsch-Head (which means "If YOU can't hear it, it doesn't matter") I present the following. It the December Stereo Review, in the Technical Talk column, Julian Hirsch quotes a paper by D. Preis of Tufts Univresity, published in the 11/82 Journal of the Audio Engineering Society, reporting ``It appears that under controlled laboratory conditions, the threshold of audibility is about 1 millisecond from 500 to 6 000 Hz (the upper frequency limit of the experiments), extending to about 2.5 milliseconds between 100 and 400 Hz. Other measurements of actual group-delay distortion of seven speakers showed peak values of seven different speakers showed peak values of 1 to 2 milliseconds from 300 to 20 000 Hz and as much as 8 milliseconds at 50 Hz.'' 1 millisecond at 6 000 Hz represents six full cycles. At 500 Hz it represents one half of one cycle. Mark Terribile hou5d!mat