BEAR
Guest
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 Posted:
Sat Nov 12, 2005 5:42 am Post subject:
Re: My first audio show - I don't get it - neither do I!! |
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dpierce@cartchunk.org wrote:
| Quote: | BEAR wrote:
First, I don't know what show that is/was in Denver - I do know about
AES, NAB, CES and The SHOW, as well as the "Stereophile Show."
It is quite obvious why nothing sounded good in Denver. The speakers are
all designed to work properly at sea level atmospheric pressures - at
the altitude that Denver is at (ca. 5,000 ft up) the air is too thin, so
the "center design point" is shifted up at least one octave. The effect
is to make everything either sound like Mini Mouse (appologies to Mickey
and Disney) and/or cause the bass to lack the "weight" that it needs
(again due to the gossamer lightness of the thinner air molecules).
One could supply the multitudinous equations to prove this point, but
that is likely beyond the scope of the thread.
Well, I think you have done a disservice by NOT supplying such.
Please, DO supply the "multitudinous equations" that prove your
assertion:
"at (ca. 5,000 ft up) the air is too thin, so the
'center design point' is shifted up at least one
octave."
as well as your assertion:
"The effect is to make everything either sound like
Mini Mouse"
and finally:
"cause the bass to lack the 'weight' that it needs
(again due to the gossamer lightness of the thinner
air molecules)."
The basic load presented to a diaphragm goes as:
p c^2
where p is the density of air and c is the speed of sound
in air. Now, the obvious large dependency here is c, since
the depednecy is on the square of the speed of sound, but
over and enormous range of densities, far exceeding what
humans would want to tolerate, the speed of sound is
essentially dependent upon temperature, and we have no
data to suggest that the temperature in the listening rooms
is substantially different than aty sea level.
That leaves p, density, as a function of altitude. Quick search
indicates, for example, that the density of air at 2 km (about
1.2 miles) is about 83% that at sea level.
Since it doesn't seem that the speed of sound is a factor, it
must be the density, and for "at least an octave" shift to
occur, SOMETHING must go as at least the CUBE of density. In all
the equations this person is aware of, there's no cube of air
desnity.
Please, since you have raised the assertion, SHOW us the
equations that tell us the "center design point is shifted
up at least one octave." Sine there are "multitudinous" such
equations, you should be able to supply at least a few, yes?
Show us how, in these "multitudinous equations" how "the
effect is to make everything either sound like Mini Mouse."
And, by "us," I don't mean myself or the readers of r.a.h-e.
I mean "us" like Beranek, Kinsler, Frey, Thiele, Small,
Blackenstock and others, because in various texts and papers
and research, they seemed to have missed these multitudinous
equations.
I may sound somewhat condescending, but, frnakly, you're reading
some SERIOUS skepticism. This is the first this claim has been
made in these terms. Not that the effect may or may not exist,
but that there are, in fact, "multitudinous equations."
Where are they?
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It's HUMOR, Mr. Pierce, humor.
Sarcastic humor, but humor never-the-less.
But given the seriousness of the replies, my only thought is that y'all
are takin' this stuff far too seriously, far too seriously.
I apologize to all who might have considered my post to be intended as
factual or otherwise non-humorous.
Ah well...
Good Listening!
_-_-bear
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