Natural Science Forum / Physics / Acoustics / May 2006

For those of you who are interested in infrasound wave research topics.
I have founded a new group called Infrasound Wave Research Group (IWR).
If you have something to contribute or question to ask, donot hesitate
as we intend to share our knowledge for the benifite of research.

Know a California venue for performance/recording of solo and
small-ensemble classical music? It needs to have *excellent acoustics
(on the "live" side rather than the reverse) and to be *quiet both
*electromagnetically (no SCR dimmers, no flourescents that can't be

I'm getting Clio measurement system, I need a good amplifier, but my budget is already tight...also, I'm located in Malesia so it needs to be a world famous brand, I was thinking about a 80W on 8W max. I was thinking of searching for a Carver, but the more names you can give me ...

I am doing a project about reducing fan noise in a room with the help
of sound absorbing materials. I want to what sound absorbing material
will be most effective. What about cardboard and thermocol?
thanx

Anyone there who can answer this question. I Found This Question Lying
amidst Science fair project topics And want the answer to the question.
I'll take up the science fair project for IISEF. After launching a
coupe of gooogle searches i found this can be achived due to

I have found a nice house to haunt and don't like to travel.  The immediate
problem is that I need to have an out-of-state client make and record some
measurements and send the recordings to me to analyze using equipment that
is not easily transported.  A walkman type DAT machine ...

I am I right in thinking that sound is like pushed in a long hall /
corridor ? The reverberations back and forth form lots of wave fronts
? How much sound can travel around a corner of a corridor ? How can
this spread of the original sound be calculated ?

I've seen vibrations measurement systems that use laser as a pick-up, I
guess not as a mic would do, but often to check on resonance frequencies of
cones i.e.
I'm not talking about the very expensive systems that lets you see breakup

i would be grateful if someone would point out some good
online resources for guitar acoustic properties.
(any research,theory or experiments would do)
 have a nice day :-)

Can someone please guide me how to analyse microphones measuring
results?
What do I need to know? How to interpret the different graphs? What
kinds of graphs are relevant?

I am trying to make a room as quiet as (reasonably) possible,
especially below 200 Hz.
The room is a laboratory about 6m wide by 8m long by 4m high.  The
floor is linoleum, the ceiling is exposed concrete (and lots of ducts

I am new to this group and I have a question about acoustic consultants
in the Minneapolis/St. Paul area.  I work at the University of
Minnesota’s School of Music.  Our 160 seat recital hall needs some
isolation work.  There are significant transmissions from near by

Is there any standards, like the BS5438 (that is for cloth on garments) that
I could use for the spiders, and cones.  I've gone trough AES, but they
don't have anything about it. Nonetheless ALMA.
Suggestions?

I've had some predictions of sound reinforcement performance done with EASE,
which include RASTI predictions.   I am a bit mysitifed as the RASTI comes
in three different flavours, decribed as 3 octave analyses centred on 500,
1000 and 2000  Hz.    To my understanding, STI and ...

I want to 'tune' the exhaust of a generator to peak the effciency at
3600 rpm.Thats 30 bangs per sec, and if the bang travels 1120 ft/sec
down the pipe, a 1/2 wavelength pipe would be about 15 ft long! If the
cylinder had 6 in^3 volume, and the piston comes up in 8ms, and the