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From: "Phil Allison"
References: <firstname.lastname@example.org> <0QLT9.20902$jM5.email@example.com>
Subject: Re: Acoustic Feedback reduction
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 11 Jan 2003 21:11:31 +1100
NNTP-Posting-Date: Sat, 11 Jan 2003 21:00:53 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"g0mem" wrote in message
> > ** These units affect the sound quality MUCH more than a +4 Hz
> > They can only notch a handfull of different frequencies. A frequency
> > shifter can kill up to 2000 simultaneously with no change in tonal
> quaility, no set up and no need to alter settings for room full or empty.
> It would cetainly be noticable with miked up acoustic instruments, e.g. a
> piano. People would here the piano itself and the piano +4Hz sharp coming
> out of the PA system, it would sound horrible.
** Bull. You have not tried it and you do not know.
The sound from the PA ought to be louder than the one from the
piano and arrive earlier by many mS. No beats are heard in this case.
> As Walter pointed out they notch out the offending feedback frequencies by
a couple of dB.
** The notches are much deeper that that since the peaks that cause
them are more like 6 - 10 dB above the average. The peaks are caused by
room acoustics too so you are destroying the direct sound to fix a problem
in the reverberation.
> Which has> much less affect on the tonal quality than listening to an
> SHARP or FLAT.
** Stupid remark. The whole performance is shifted. Nothing is flat or
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