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Re: Directional bass

Subject: Re: Directional bass
From: Rob Danielson <>
Date: Wed, 24 Apr 2002 10:37:34 -0500
And thus the evolution to cars and rush hours!

  =3D =3D =3D =3D =3D

>Rich and NatureRecordists:
>Klas' reply prompts me to add to this thread.  In 1999 I had the pleasure
>of working with Dr. Michael Garstang, a meteorologist who was interested
>in recording elephant vocalizations.  He pointed out something that all of
>us NatureRecordists have known, but which few of us has really stopped
>to realize: that surface air turbulence and winds have circadian rhythm,
>being minimal at dawn and dusk, and that temperature inversions are
>most apt to occur at such times.  Of course, one consequence of temper-
>ature inversion is that sound is "channeled" or "ducted" along the surface=
>We also know that low frequencies travel further than high frequencies,
>as evidenced by the spectral difference between the "crack" and "rumble"
>of nearby and distant thunder, respectively.  Combine this with the mini-
>mized turbulence, and you have a formula to favor evolution of acoustic
>communication systems which, for long distance efficacy, use low
>frequencies and do so primarily at dusk and/or dawn.
>Good recording,
>                              Randy

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