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From: "Phil Allison"
Subject: Re: Acoustic Feedback reduction
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Mon, 13 Jan 2003 19:04:02 +1100
NNTP-Posting-Date: Mon, 13 Jan 2003 18:53:20 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Alan Fowler" wrote in message
> Not that I am aware of. What are you actually
> trying to do - provide a higher sound level without
> feedback? If so there are a number of options.
> 1. Use an electrical delay (adjustable) delay line to delay
> a copy of the original sound by the time for the sound to
> reach the microphone from the speaker(s) and feed it into
> the amplifier in opposite phase and at a level to cancel the
> 2. use correctly designed and placed column speakers to
> keep the level at the microphone low enough to prevent
> 3. Use a number of speakers along the length of the hall
> with the appropriate electronic delay in the feed to each
> speaker so that there are no obvious multiple sound sources.
** Only works for some of the audience.
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