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From: ark@rabbit.UUCP (Andrew Koenig)
Newsgroups: net.audio
Subject: Re: Feedback Problem
Message-ID: <3048@rabbit.UUCP>
Date: Fri, 10-Aug-84 15:18:51 EDT
Article-I.D.: rabbit.3048
Posted: Fri Aug 10 15:18:51 1984
Date-Received: Sat, 11-Aug-84 01:02:44 EDT
References: <42400002@hpfclo.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 16

Bob Schneider complains about feedback in a situation where his
turntable is on a shelf mounted on a wall in the same room as the
speakers.

This sounds like a classic case of acoustic feedback.  As a test,
you might try changing something about the acoustic coupling between
turntable and speakers and see if it changes the character of the feedback.
For instance: put the turntable on several layers of blankets,
move it elsewhere in the room, or run it with the dust cover open
if it's normally closed (or closed if it's normally open).
If this is the problem, there are several products designed to
cope with it.  Audio-Technica (I think), for example, makes a set
of mushy feet to put your turntable on.  Someone (I forget who)
makes a heavy marble slab on soft feet.  For all these doodads,
the purpose is the same: to prevent the sound from the
speakers from affecting the turntable.