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From: ron@brl-tgr.ARPA (Ron Natalie <ron>)
Newsgroups: net.audio
Subject: Re: Small level differences- CD comparisons
Message-ID: <11257@brl-tgr.ARPA>
Date: Sat, 8-Jun-85 21:42:04 EDT
Article-I.D.: brl-tgr.11257
Posted: Sat Jun  8 21:42:04 1985
Date-Received: Tue, 11-Jun-85 07:52:36 EDT
References: <3831@alice.UUCP>
Organization: Ballistic Research Lab
Lines: 23

> at levels of roughly 80-90 dB,  a change of level on the order of
> .25-.5dB will lead to a perceived change in  low bass and high frequency
> levels on the order of 2-5dB, depending on the level and the listener.
> 
> Very small level differences at levels close to the thresholds for
> extreme frequencies cause huge differences in the perceived level.  
> It's a well established FACT!  See any of the 1940's and so
> papers on hearing.  (Fletcher and Munson comes to mind, not too
> surprisingly.)

I know all about Mssrs. Fletcher and Munson.  I didn't give any value
judgement on the quality of the players, only that they were different.
Even with the F&M curves, we should have been able to get the levels
close enough that the EQ's matched if they were ideally the same.
However, it each case, the NEC EQ was different (to the less bright
side, than the Meridan).

Of course, we weren't able to say which one was correct, it was just
a passing observation.  The major aspect of the test, the comparison
against the SLP7 is unaffected by levels.  You can hear the SLP7 distort
at any level with respect to a decent CD player.

-Ron