Getting esoteric on infrasound Re: [sdiy]

[Peter Grenader]

<<Credit for the garden variety electric vibrator goes to Mr. Tesla as well,
> who experimented with willing test subjects who's experiences ranged from
> muscular pleasure to instant, uncontrollable incontinence and associated
> bodily functions...>>

Yes, it's true.  Vibrators do cause blood clots. And studdering

B-b-b-b-but seriously folks...

the bottom line is, loud loud sound is obnoxious.  music can be designed to
get your attention for being obnoxious - but there are also so many others
that aren't.

I was in a lecture conducted by LeMonte Young once.  Small class room, 25
people inside, closed doors.

The first thing he did was light a firecracker in the class to prove some
piont about the absence of sound.  I had my dog in the class, he freaked.
Everyone got annoyed, actually.  Chas Smith, who now is pretty famous I
guess for microtonal work, who was also a composition student and there at
the time got pretty angry at this and told Young what he thought of his
experiment in plain Irish.  Pretty much everyone was routing for Chas on
that one.

I'm not sure this story is totally applicable, but thereis a poitn about the
reaction to obnoxious sound.  My feeling is a composer's job is to take a
person's attention.  But i feel the composer has a responsibility for that.
They will give  you their attention for about 20 seconds and your challenge
is to keep it as long as you want it after that  Done masterfully and you
will own it, no matter how soft or loud the sound is.  This is secondary to
its quality.

my $0.02



on 4/21/02 10:24 PM, Cynthia Webster at cynthia.webster at gte.net wrote:

> 
> Getting esoteric on infrasound
> 
> So at what point is it no longer sound?
> Is that when the movement of air is exchanged for the movement of earth?
> 
> What drastic changes occur at this threshold?
> 
> In addition to credit for inventing many things including radio, and
> the florescent light, Nikola Tesla invented the AC motor, and did many
> experiments throughout the spectrum including those of mechanical
> vibrations.
> 
> Credit for the garden variety electric vibrator goes to Mr. Tesla as well,
> who experimented with willing test subjects who's experiences ranged from
> muscular pleasure to instant, uncontrollable incontinence and associated
> bodily functions...
> 
> Throbbing gristle indeed!
> 
> A parallel of this can be found in transonic ballistics, the point in a
> bullet's trajectory where it falls below the speed of sound.
> At this moment the trajectory actually makes drastic changes.
> The study of this is part of another black art -
> subsonic sniping by stealthy assassins...
> 
> We can keep going slower and slower until we reach the resonant frequency
> of a suspended spinning body - such as the Earth itself...
> 
> At what point does it become evil? and when not?
> and what is the transvibrational threshold - where vibration of the Earth
> changes to that of... (what)?
> The periodic table of the elements? or the duration of time we call a
> century? 
> 
> "Limbo Boy - how Low can you go"?
> 
> pray tell, why do you want to expend so much energy
> so far down?
> 
> What drastic changes do you seek?
> 
> 
> 
> 
> on 4/21/02 5:52 PM, Grant Richter at grichter at asapnet.net wrote:
> 
>> Infra sound of sufficient power and at the resonant frequency of the thorax
>> is reputed to be able to cause cavitation based hemorrhages. In other words,
>> the pressure extremes in your body at resonance may cause blood clots, which
>> may cause stroke or heart attack.
>> 
>> Urban legend has it that experimenting in such black arts is always fatal to
>> the experimenter...
>> 
>> "Those who worship dark Gods should meet them." - Conan the Barbarian
>> 
>>> 
>>> One problem with generating low freqs is the speakers.
>>> A 30Hz wave is 30 feet across. This tough to do with
>>> any kind of efficiency with a 15 inch driver. One way
>>> around this is to use an acoustic transformer, or as
>>> they are commonly known, horns. My Klpisch corner
>>> horns can reproduce down below 20Hz if in a big enough
>>> room.
>>> 
>> 
>