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From: brent@itm.UUCP (Brent)
Newsgroups: net.audio
Subject: Re: CD musings and freqs gt 20 kHz
Message-ID: <226@itm.UUCP>
Date: Sun, 20-Jan-85 15:00:49 EST
Article-I.D.: itm.226
Posted: Sun Jan 20 15:00:49 1985
Date-Received: Wed, 23-Jan-85 07:03:26 EST
References: <162@lcuxc.UUCP>
Reply-To: brent@itm.UUCP (Brent)
Organization: In Touch - Atlanta, GA
Lines: 26
Summary: 


X
    OK folks, let's cover this ground again.  Opinionate all you
want, I'll stick to experimental fact:

    KEF labratories in England do an extensive amount of psychoacoustic
research in the design of their speaker systems.  They do things like
have a person and a pair of speakers behind a screen, and do double-
blind listening comparisons of the person and a tape recording of that
person.  They double-blind switch in distorters, 9-th order elliptic
filters, etc.  What have they learned after doing thousands of
tests on hundreds of subjects?  Well, when the great digital debate
first came up in the Audio Engineering Socitey, KEF took their 
equipment to one of the conventions, ran the tests for anyone who
wanted to participate, published the raw test scores and the 
statistical conclusions.  In short, it was an extensive research
project.

        THE RESULT:  (drum roll, please)

            Nothing above 16 kHz makes any difference.

And so the professional audio community was convinced.  Don't 
argue with me, argue with KEF's numbers.
-- 
            Brent Laminack  (akgua!itm!brent)