Contrabass Digest
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1998-07-08

 
list                           Wed, 8 Jul 1998            Volume 1 : Number 24

In this issue:
 

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Date: Wed, 8 Jul 1998 00:14:00 EDT
From: <Fmmck@aol.com>
To: list@contrabass.com
Subject: Re:  Re: sub-woofer hearing

In a message dated 7/7/98 7:13:43 PM, you wrote:

<<This is why one can
listen to recorded music with significant bass content even over very small
speakers.  Consider how large the speaker in a headphone is.  You can
demonstrate physically that the tiny cone is incapable of putting out a
significant amplitude in the bass range, yet we hear bass all the same.>>

Grant-

I'm not a "recording engineer", but I do have some experience with headphones.
It is true that the cone of an earphone would not couple much low frequency
sound into the air if it was in open space.  However, you normally don't
listen to it that way.  You normally have it resting on your ear with a foam
cushion sealing around the ear.  The cone only has to couple low frequency
sound to the small volume of air between the cone and the eardrum.  This is
much more efficient than the open space situation.

Look at it in reverse.  The eardrum is equivalent to a very tiny speaker (or
microphone) cone, and we know it is capable of receiving sound down to some
low frequency, whether it be 15 or 30 Hz.  The problem isn't just "receiving"
sound.  It also involves recognizing that the received sound is present, and
that it is indeed a pure, low frequency tone, rather than the harmonics
generated by something rattling nearby.  If you normally can't recognize a 5
Hz sound as a tone, increasing the amplitude could cause ear damage, and you
still wouldn't hear a fundamental tone.

I live about 15 miles from the Space Shuttle launch pads.  When there is a
launch, I can't hear much of the sound from this distance.  All I can hear is
the house windows rattling at something like 5 or 10 vibrations per second.
In this case, it seems obvious that what I hear is actually a pulsing high
frequency sound from the loose window pane beating against its frame.

Fred

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Date: Wed, 08 Jul 1998 13:16:19 -0700
From: Grant Green <gdgreen@contrabass.com>
To: list@contrabass.com
Subject: Contrabass clarinet mpc

From: mgrogg@juno.com
To: gdgreen@crl.com
Date: Wed, 8 Jul 1998 15:49:05 -0400
Subject: Contrabass Clarinet Mouthpiece for sale

Grant,

You might want to crosspost this or whatever to the list.  There is a
Contrabass Clarinet Mouthpiece up for auction on ebay.com

There maybe some interest in it from the low reed players

Michael Grogg
Tuba
SubContrabass Hosaphone

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This Contrabass Clarinet mouthpiece is in LIKE NEW condition as it has
only been used a few times. It has a medium average facing and plays just
fine. Made by Woodwind Co.   This is the same mouthpiece put with Leblanc
Contras from the factory. I should add that  this mouthpiece will fit
ONLY Leblanc Eb and BBb Contra clarinets, and Selmer (Paris)  BBb contra
clarinets. NOT Selmer (Paris), Selmer (Bundy), Ripamonti, or Buffet Eb
contras. All Leblanc contra clarinets use the same mouthpiece, this one.
These mouthpieces retail for $185. Get this one cheap. Buyer pays $3.75
Insured shipping.   LOW Reserve.
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++++++++++++++++++++++++++++++++++++++++++++++++++++++
Grant D. Green                  gdgreen@contrabass.com
www.contrabass.com     Just filling in on sarrusophone
Contrabass email list:             list@contrabass.com
++++++++++++++++++++++++++++++++++++++++++++++++++++++

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End of list V1 #24
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