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Making It Loud?
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Bob Cain
science forum Guru


Joined: 07 Jun 2005
Posts: 360

PostPosted: Fri Jul 21, 2006 3:04 am    Post subject: Re: rec.audio.pro Cronymob FAQ v2.1 Reply with quote

Bob Cain <arcane@arcanemethods.com> wrote in
news:GqudnWlNVr4GKCHZnZ2dnUVZ_vGdnZ2d@giganews.com:

snip.........snip

Quote:
"And why beholdest thou the mote that is in thy brother's eye, but
perceivest not the beam that is in thy own eye?" - J.C.

Bob



Fascinating! Here we have the eiptome of hypocrisy quoting the bible
to pass judgment on the very behavior in which he routinely engages.

One can only imagine what sort of drivel this delusional psychotic
piece of human waste will bestow upon us next.


Gary Sokolich


Bob
--

"Things should be described as simply as possible, but no simpler."

A. Einstein
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Malcolm Hayes
science forum beginner


Joined: 01 Aug 2005
Posts: 4

PostPosted: Mon Apr 03, 2006 9:11 am    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

"GregS" <szekeres@pitt.edu> wrote in message
news:e0bf9o$ecf$2@usenet01.srv.cis.pitt.edu...
Quote:
In article <e0bek7$ecf$1@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS) wrote:
In article <1143502912.762645.5130@u72g2000cwu.googlegroups.com>, "bert
stoltenborg" <bert@chaingang.nl> wrote:
Doesn't have a jet aircraft loads of Low freq?

I think so, but the higher freqs dominate. I think it reminds me of a
acetelyne
torch, but a whole bunch louder. In another group, a driver by
Community was given which could deliver the 137 dB and more,
but limited from 100 to 4 kHz.

I can appreciate the noise involved. I have been to the drag strip,
and sat both to the side and very close to the rear of one of
those jet things. I put it on my camcorder, and played it back on the
stereo
with much of the same impact. Even though my camcorder does
a pretty good job on audio, there is some clipping involved. I don't
know the exact SPL these people are receiving at the track and at
indoor events. Some of the funny cars are pretty loud also.

greg


I once caused panic with the operators of a Drag Racing Track when I
appeared at track side with a sound level meter and DAT Recorder. I measured
levels around 150 dB peak (around 10 metres from the cars) when the top
fuelers disappeared off down the track. Most impressive was the measured DC
shift in air volume from the exhaust gas emissions. More worrying were the
kids in the stands behind not wearing any hearing protection.
MalcolmX
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GregS
science forum beginner


Joined: 30 Jun 2005
Posts: 47

PostPosted: Fri Mar 31, 2006 8:37 pm    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

In article <L-SdnRyiaKiKEbDZRVnyjg@pipex.net>, "Geoff Leventhall" <ascc85@dsl.pipex.com> wrote:
Quote:
If you look at www.iasca.com and click on News, you'll find that somebody
reached 180.3dB with his car audio - but probably not for long

For more than one reason. A car cannot make that much current for long, where
most of the power is comming from the battery. I have seen vans
at CES with 16 woofers, driven by about 6000 watts.
For the most part, making the peaks is only for the bass. Its
probably too hard to precisly add phases with high frequencies
to get anywhere near that sound level.

greg

Quote:


"GregS" <szekeres@pitt.edu> wrote in message
news:e08rcr$pei$4@usenet01.srv.cis.pitt.edu...

In article <e08qqd$pei$2@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS) wrote:
In article <e08poc$pei$1@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS)
wrote:
In article <1143413480.924066.270670@i40g2000cwc.googlegroups.com>,
"edward"
edward@dellaenterprises.com> wrote:
Hello,

I am testing a sound protection and recording system that will
withstand very loud sounds. I need to test in a sound field that is at
least 135dB or better. I'm performing real world testing at 135 to
153dB SPL and need to simulate those levels in a room in my office
building. Can someone suggests a combination of components (speakers,
amplifiers, etc) and manufacturers that can get me close to these
ranges. The sounds that I am wishing to replicate are from jet aircraft

You might be able to get the levels and relative bandwidth using
a horn driven by an air gun of some sort. I'm crossposting this
message.

greg


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Geoff Leventhall
science forum beginner


Joined: 31 Mar 2006
Posts: 1

PostPosted: Fri Mar 31, 2006 8:07 pm    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

If you look at www.iasca.com and click on News, you'll find that somebody
reached 180.3dB with his car audio - but probably not for long

Geoff



"GregS" <szekeres@pitt.edu> wrote in message
news:e08rcr$pei$4@usenet01.srv.cis.pitt.edu...
Quote:

In article <e08qqd$pei$2@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS) wrote:
In article <e08poc$pei$1@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS)
wrote:
In article <1143413480.924066.270670@i40g2000cwc.googlegroups.com>,
"edward"
edward@dellaenterprises.com> wrote:
Hello,

I am testing a sound protection and recording system that will
withstand very loud sounds. I need to test in a sound field that is at
least 135dB or better. I'm performing real world testing at 135 to
153dB SPL and need to simulate those levels in a room in my office
building. Can someone suggests a combination of components (speakers,
amplifiers, etc) and manufacturers that can get me close to these
ranges. The sounds that I am wishing to replicate are from jet aircraft

You might be able to get the levels and relative bandwidth using
a horn driven by an air gun of some sort. I'm crossposting this
message.

greg
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TheGhost
science forum addict


Joined: 09 Aug 2005
Posts: 85

PostPosted: Tue Mar 28, 2006 2:24 pm    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

Greg Locock <greglocock@yahoo.com.au> wrote in
news:Xns9794A4606A7BB77777777777777777777@211.29.133.50:

Quote:
szekeres@pitt.edu (GregS) wrote in
news:e08rcr$pei$4@usenet01.srv.cis.pitt.edu:


In article <e08qqd$pei$2@usenet01.srv.cis.pitt.edu>,
szekeres@pitt.edu (GregS) wrote:
In article <e08poc$pei$1@usenet01.srv.cis.pitt.edu>,
szekeres@pitt.edu (GregS)
wrote:
In article <1143413480.924066.270670@i40g2000cwc.googlegroups.com>,
"edward"
edward@dellaenterprises.com> wrote:
Hello,

I am testing a sound protection and recording system that will
withstand very loud sounds. I need to test in a sound field that is
at least 135dB or better. I'm performing real world testing at 135
to 153dB SPL and need to simulate those levels in a room in my
office building. Can someone suggests a combination of components
(speakers, amplifiers, etc) and manufacturers that can get me
close to these ranges. The sounds that I am wishing to replicate
are from jet aircraft

You might be able to get the levels and relative bandwidth using
a horn driven by an air gun of some sort. I'm crossposting this
message.


I've seen and used a compressed air chamber modulated by a slide valve
to create high SPLs. It was not high fidelity by any means, but was OK
for signal analysis.



http://www.wylelabs.com/sp1b.html
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GregS
science forum beginner


Joined: 30 Jun 2005
Posts: 47

PostPosted: Tue Mar 28, 2006 1:55 pm    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

In article <e0bek7$ecf$1@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu (GregS) wrote:
Quote:
In article <1143502912.762645.5130@u72g2000cwu.googlegroups.com>, "bert
stoltenborg" <bert@chaingang.nl> wrote:
Doesn't have a jet aircraft loads of Low freq?

I think so, but the higher freqs dominate. I think it reminds me of a acetelyne
torch, but a whole bunch louder. In another group, a driver by
Community was given which could deliver the 137 dB and more,
but limited from 100 to 4 kHz.

I can appreciate the noise involved. I have been to the drag strip,
and sat both to the side and very close to the rear of one of
those jet things. I put it on my camcorder, and played it back on the stereo
with much of the same impact. Even though my camcorder does
a pretty good job on audio, there is some clipping involved. I don't
know the exact SPL these people are receiving at the track and at
indoor events. Some of the funny cars are pretty loud also.

greg
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GregS
science forum beginner


Joined: 30 Jun 2005
Posts: 47

PostPosted: Tue Mar 28, 2006 1:44 pm    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

In article <1143502912.762645.5130@u72g2000cwu.googlegroups.com>, "bert stoltenborg" <bert@chaingang.nl> wrote:
Quote:
Doesn't have a jet aircraft loads of Low freq?

I think so, but the higher freqs dominate. I think it reminds me of a acetelyne
torch, but a whole bunch louder. In another group, a driver by
Community was given which could deliver the 137 dB and more,
but limited from 100 to 4 kHz.

greg

Quote:
Neky Lyk wrote:
"GregS" <szekeres@pitt.edu> wrote in message
news:e08rcr$pei$4@usenet01.srv.cis.pitt.edu...

In article <e08qqd$pei$2@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS) wrote:
In article <e08poc$pei$1@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS)
wrote:
In article <1143413480.924066.270670@i40g2000cwc.googlegroups.com>,
"edward"
edward@dellaenterprises.com> wrote:
Hello,

I am testing a sound protection and recording system that will
withstand very loud sounds. I need to test in a sound field that is at
least 135dB or better. I'm performing real world testing at 135 to
153dB SPL and need to simulate those levels in a room in my office
building. Can someone suggests a combination of components (speakers,
amplifiers, etc) and manufacturers that can get me close to these
ranges. The sounds that I am wishing to replicate are from jet aircraft

You might be able to get the levels and relative bandwidth using
a horn driven by an air gun of some sort. I'm crossposting this
message.

greg


i agree, try to find something with a horn and a compression chamber. no
idea about the amp.
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Greg Locock
science forum Guru Wannabe


Joined: 28 May 2005
Posts: 111

PostPosted: Tue Mar 28, 2006 6:09 am    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

szekeres@pitt.edu (GregS) wrote in
news:e08rcr$pei$4@usenet01.srv.cis.pitt.edu:

Quote:

In article <e08qqd$pei$2@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS) wrote:
In article <e08poc$pei$1@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS)
wrote:
In article <1143413480.924066.270670@i40g2000cwc.googlegroups.com>,
"edward"
edward@dellaenterprises.com> wrote:
Hello,

I am testing a sound protection and recording system that will
withstand very loud sounds. I need to test in a sound field that is
at least 135dB or better. I'm performing real world testing at 135
to 153dB SPL and need to simulate those levels in a room in my
office building. Can someone suggests a combination of components
(speakers, amplifiers, etc) and manufacturers that can get me close
to these ranges. The sounds that I am wishing to replicate are from
jet aircraft

You might be able to get the levels and relative bandwidth using
a horn driven by an air gun of some sort. I'm crossposting this
message.


I've seen and used a compressed air chamber modulated by a slide valve to
create high SPLs. It was not high fidelity by any means, but was OK for
signal analysis.
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bert stoltenborg
science forum addict


Joined: 16 May 2005
Posts: 52

PostPosted: Mon Mar 27, 2006 11:41 pm    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

Doesn't have a jet aircraft loads of Low freq?

Neky Lyk wrote:
Quote:
"GregS" <szekeres@pitt.edu> wrote in message
news:e08rcr$pei$4@usenet01.srv.cis.pitt.edu...

In article <e08qqd$pei$2@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS) wrote:
In article <e08poc$pei$1@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu
(GregS)
wrote:
In article <1143413480.924066.270670@i40g2000cwc.googlegroups.com>,
"edward"
edward@dellaenterprises.com> wrote:
Hello,

I am testing a sound protection and recording system that will
withstand very loud sounds. I need to test in a sound field that is at
least 135dB or better. I'm performing real world testing at 135 to
153dB SPL and need to simulate those levels in a room in my office
building. Can someone suggests a combination of components (speakers,
amplifiers, etc) and manufacturers that can get me close to these
ranges. The sounds that I am wishing to replicate are from jet aircraft

You might be able to get the levels and relative bandwidth using
a horn driven by an air gun of some sort. I'm crossposting this
message.

greg


i agree, try to find something with a horn and a compression chamber. no
idea about the amp.
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avare
science forum beginner


Joined: 27 Mar 2006
Posts: 4

PostPosted: Mon Mar 27, 2006 3:19 pm    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

Within the specifics of your post, EAW, Meyer, JBL, Electro-Voice,
L'Acoustics all make speakers that will met your criteria.

Good luck!
Andre
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GregS
science forum beginner


Joined: 30 Jun 2005
Posts: 47

PostPosted: Mon Mar 27, 2006 2:04 pm    Post subject: Re: Need suggestions for equipment for generating greater than 135dB SPL Reply with quote

In article <e08qqd$pei$2@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu (GregS) wrote:
Quote:
In article <e08poc$pei$1@usenet01.srv.cis.pitt.edu>, szekeres@pitt.edu (GregS)
wrote:
In article <1143413480.924066.270670@i40g2000cwc.googlegroups.com>, "edward"
edward@dellaenterprises.com> wrote:
Hello,

I am testing a sound protection and recording system that will
withstand very loud sounds. I need to test in a sound field that is at
least 135dB or better. I'm performing real world testing at 135 to
153dB SPL and need to simulate those levels in a room in my office
building. Can someone suggests a combination of components (speakers,
amplifiers, etc) and manufacturers that can get me close to these
ranges. The sounds that I am wishing to replicate are from jet aircraft

You might be able to get the levels and relative bandwidth using
a horn driven by an air gun of some sort. I'm crossposting this
message.

greg
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Sokolich
science forum beginner


Joined: 11 Feb 2006
Posts: 30

PostPosted: Thu Mar 16, 2006 2:13 am    Post subject: Re: Einstein Procrusteanizes Time Dilation - Response to Bob Cain Reply with quote

Bob Cain <arcane@arcanemethods.com> wrote in
news:dtp749028kq@enews1.newsguy.com:

Quote:
Oops, sent that last response before it was finished instead of saving
it. It's pretty late here so I'll do that tomorrow and close the loop
on why it's important.
Bob

Tomorrow has come and gone. Obviously, you either lack the ability to
defend your preposterous assertions or you lack the knowledge to discuss
the issue in an intelligent and technically-competent manner.
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Repeating Rifle
science forum Guru Wannabe


Joined: 25 Mar 2005
Posts: 205

PostPosted: Sun Mar 05, 2006 5:15 pm    Post subject: Re: newbie Q: sound absroption Reply with quote

On 3/5/06 5:02 AM, in article
ejBOf.226$sL2.112@newsread2.news.atl.earthlink.net, "Noral Stewart"
<noral.stewart@ixdotnetcomdotcom> wrote:

Quote:
Have you thought about what the main ingredient in fiberglass is? I think
they have shown that mice forced to eat very large quantities of fiberglass
develop cancer also. Question is whether the material can actually get into
your system in sufficient quantity to do any damage. Fiberglass fibers are
very large compared asbestos fibers, and thus do have have the same danger
of inhalation into the lungs.

Also, glass (sodium and calcium silicates) is more soluble in body fluids
than silica.

Bill

-- Ferme le Bush
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Repeating Rifle
science forum Guru Wannabe


Joined: 25 Mar 2005
Posts: 205

PostPosted: Sun Mar 05, 2006 5:15 pm    Post subject: Re: newbie Q: sound absroption Reply with quote

On 3/5/06 5:02 AM, in article
ejBOf.226$sL2.112@newsread2.news.atl.earthlink.net, "Noral Stewart"
<noral.stewart@ixdotnetcomdotcom> wrote:

Quote:
Have you thought about what the main ingredient in fiberglass is? I think
they have shown that mice forced to eat very large quantities of fiberglass
develop cancer also. Question is whether the material can actually get into
your system in sufficient quantity to do any damage. Fiberglass fibers are
very large compared asbestos fibers, and thus do have have the same danger
of inhalation into the lungs.

Also, glass (sodium and calcium silicates) is more soluble in body fluids
than silica.

Bill

-- Ferme le Bush
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Hero
science forum Guru Wannabe


Joined: 29 Apr 2005
Posts: 220

PostPosted: Sun Mar 05, 2006 2:48 pm    Post subject: Re: from Bekesy to cochlear implants Reply with quote

Jan Panteltje schrieb:

Quote:
On a sunny day (5 Mar 2006 01:19:37 -0800) it happened "maestro"
StpNrrs@aol.com> wrote in
1141550377.841722.213380@j33g2000cwa.googlegroups.com>:

I find the system you propose very interesting, but will have to read this
some times to make sure I grasp exactly what you mean.
I have my own idea, and have been attacked for that (here).
I come from an electronics background, and have quite a bit audio experience
(recording studio).
From an electronic perspective, the little (wound tube) with fluid sort of
is a serial to parallel converter.
The sound comes in, is lead to the membrane at the start of that tube.
Because of the fluid in the tube, the pressure variations now move much
faster (then in air).
(Think if we originally came from the sea as species, we took the water with
us).
.............
The tube is conical, and reflections may or may not occur at its end,
leading to a standing wave pattern, in which case indeed some points
along the tube would be active for some frequencies more then others, but I
say: serial to parallel converter (shift register in electronics).
Here are my 2 cents to this.

A flood wave running into the mouth of a river is steeping up, so the
sine-wave-form of the tides change to a sawtooth-like form. Something
similar happens in waves, which are not surface-waves, when they move
into a narrowing opening
Quote:
The tube is conical....
Have success

Hero
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