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From: nz@wucs.UUCP (Neal Ziring)
Newsgroups: net.audio
Subject: Re: equalizers
Message-ID: <1048@wucs.UUCP>
Date: Tue, 23-Jul-85 13:26:26 EDT
Article-I.D.: wucs.1048
Posted: Tue Jul 23 13:26:26 1985
Date-Received: Thu, 25-Jul-85 05:55:41 EDT
References: <7351@watdaisy.UUCP>
Distribution: net
Organization: Washington U. in St. Louis, CS Dept.
Lines: 37
Summary: good experience with BSR

In article <7351@watdaisy.UUCP>, gvcormack@watdaisy.UUCP writes:
> It is my impression that almost all differences between reasonable
> quality stereo components can be attributed to differences in
> frequency response across the audio spectrum.  Therefore, I have 
> decided that I should buy a multi-band equalizer.
> 
> Second, I don't see how one could possibly calibrate the system by
> ear.  It seems to me that one would want to measure the SPL generated
> by a known source.
> Gordon V. Cormack      CS Department, University of Waterloo

	I recently bought a BSR Q3000 (?) 10-band octave equalizer.  It
has a built-in pink-noise generator, octave spectrum analyzer, and
comes with a (supposedly) calibrated microphone.

	Having a spectrum analyzer on the equalizer makes equalizing a
room or a tape deck quite easy -- equalizing a room takes < 20 min.

	One thing to watch in calibration (and this is what makes it
rather difficult) is that the slide controls on the equalizer do
not effect only thier portion of the freqency band.  As is typical
in that kind of gain/attenuation circuitry, they affect frequencies
further from their center frequency less, but moving the 500 Hz control
will have some effect on a 125 Hz test tone.

	In my humble opinion, the addition of a fairly good equalizer
has improved the sound of my system immensely, and the spectrum analyzer
is a lot of fun to watch.
-- 
========
...nz (ECL - we're here to provide superior computing)
	Washington University Engineering Computer Laboratory

    "Now we'll see some proper action..." 

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