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Forum index » Science and Technology » Physics » Acoustics
Making It Loud?
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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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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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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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