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From: wilson@convex.UUCP
Newsgroups: net.audio
Subject: Re: equalizers
Message-ID: <32900018@convex>
Date: Fri, 9-Aug-85 03:07:00 EDT
Article-I.D.: convex.32900018
Posted: Fri Aug  9 03:07:00 1985
Date-Received: Sat, 17-Aug-85 06:30:16 EDT
References: <7351@watdaisy.UUCP>
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Nf-ID: #R:watdaisy.UUCP:-735100:convex:32900018:000:1453
Nf-From: convex.UUCP!wilson    Aug  9 02:07:00 1985


If differences in signals between two systems are not evident in their
frequency responses then somebody had better publish that quick !
EE departments throughout the world are teaching students otherwise
when they introduce the poor unsuspecting people to Fourier transforms.

Seriously though, an (analog) equalizer doesn't exist which could be used
to correct anything other than gross disturbances in the system's
frequency response.  My system has and has always had such disturbances
(they vaired from dwelling to dwelling, though) and I've used an octave
wide Soundcraftsmen equalizer for years.  In my case, it's been better
than nothing (my speakers seem to have a nasty peak around 7000 Hz no
matter what kind of room they're in) but I've convinced myself that a
1/3 octave equalizer would be far superior.  These are not at all cheap
though, and I could probably replace my speakers and solve the problem
that way for a little more money.

My Soundcraftsmen eq. came with a record that has bands of octave centered
pink noise on each channel at a time, with an (optional if you have a meter)
Fletcher-Munsen weighted reference signal in the opposite channel.

In actual use, the "flat" eq. setting arrived at through iterations of the
test record was fine for a starting point, but often slightly changed for
individual source material.  Some source is best with the eq. out of the
loop entirely.

{ihnp4,allegra,uiucdcs,ctvax}!convex!wilson