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From: rentsch@unc.UUCP (Tim Rentsch)
Newsgroups: net.audio
Subject: Re: CD musings and freqs gt 20 kHz
Message-ID: <93@unc.UUCP>
Date: Tue, 22-Jan-85 23:49:49 EST
Article-I.D.: unc.93
Posted: Tue Jan 22 23:49:49 1985
Date-Received: Fri, 25-Jan-85 21:10:20 EST
References: <162@lcuxc.UUCP> <itm.226>
Reply-To: rentsch@unc.UUCP (Tim Rentsch)
Organization: CS Dept., U. of N. Carolina at Chapel Hill
Lines: 34
Summary: 

In article <itm.226> brent@itm.UUCP (Brent) writes:
>
>    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.

The stated result strikes me as incomplete.  Shouldn't it instead read:

    Nothing above 16kHz makes any difference to the test participants
       given the speakers (amplifiers, etc.) used in the test.

Wonder if they were using KEF speakers by chance....

cheers,

Tim

"I prefer to hear my drum rolls on good equipment."