Re: Doppler Distortion - Fact or Fiction?

From: Bob Cain (arcane_at_arcanemethods.com)
Date: 08/21/04 

Date: Fri, 20 Aug 2004 18:21:47 -0700

These are very good questions for which there don't seem to
be any ready answers.

Bob

DAH wrote:

> I have been considering the various mechanisms which might produce the
> alleged acoustic FM, and it has led to questions.
>
> 1) Typically, matched NPN/PNP push-pull amplifiers are used to drive
> the speakers. A good audio amp has low distortion, but the level of
> distortion is somewhat dependent on the impedence match of the
> speaker/load. Can the audiophiles be sure that the FM does not
> originate in the intrinsic amp-speaker signal distortion?
>
> 2) Turbulence is a non-linear phenomena in air. How would one model
> the turbulence at the speaker/air interface? Could turbulence cause
> acoustic FM?
>
> 3) Not all speakers are made the same. Don't electrostatic speakers
> use polymer membranes? Don't some tweeters use metalic membranes?
> What is that fabric/composite material which is typically used to
> make midrange speakers? It looks like it is porous. Do the
> audiophiles claim that all midrange speakers exhibit the audio FM
> phenomena, or just those made of the typical porous material? I.e.
> is the speaker material a critical aspect.
>
> DAH 8/20/04
>
>
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-- 
"Things should be described as simply as possible, but no 
simpler."
                                              A. Einstein

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