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Klarinet Archive - Posting 000538.txt from 2001/02

From: Bill Hausmann <>
Subj: Re: [kl] Difference Tones
Date: Wed, 14 Feb 2001 23:46:15 -0500

At 06:26 PM 2/14/2001 -0700, Grant Green wrote:
>A vibrating wall could either reinforce or cancel (partially or totally)
>the vibration produced by the pipes, depending the phase. If the sound
>waves from the wall are out of phase with the waves through the air,
>you'll get cancellation. Unless the wall is *really* vibrating, I don't
>think its likely that the wall would cancel much of the air vibration.
>If the wall material reacts non-linearly, it should produce a difference
>tone (heterodyne components). Same goes for the bodies of the audience...
>Of course, I don't think we've established that the 64' resultant is
>actually the cause of the shaking: it could just be the fact that an
>additional 32' pipe is speaking. I'd like to know if the church shakes
>when you play two of the 32' pipes that aren't a fifth apart.

But all the evidence is that the walls, microphone diaphragms, etc., are
vibrating AT 8 HZ! This would mean that SOMETHING is producing that
frequency. If it is not the pipes, then what? Either these objects are
responding to sound waves in the air produced by the organ pipes, or they
are themselves creating the sound waves with their own vibrations. But if
that is the case, what is causing them to vibrate AT THAT FREQUENCY?

Bill Hausmann
451 Old Orchard Drive
Essexville, MI 48732 ICQ UIN 4862265

If you have to mic a saxophone, the rest of the band is TOO LOUD!

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