Natural Science Forum / Physics / Acoustics / January 2004

Can anybody help me with 'White noise test' in a conduct?
I would like what this test consist in, which instrumentation I need,
websites with information about it. Any information will be wellcome.
Thank you!

im am searching a liquid with a very low speed of sound about 80 m/sec and
nearly the same density as water.( 0,6- 2,3 gr/cm^3)
Thank you
Andy

Folks,
I've heard there's an acoustics theory that says if you treat one room mode,
by extension you are also treating the multiples and "subharmonic" modes.
This makes no sense to me, but I thought I'd run it by the experts here

I hope someone can help me, a pure novice at this room acoustics stuff.
But I was reading on another forum about someone using the corner of 2 vertical
brick walls 8 ft high as a diffuser for his flat panel dipole loudspeakers that
were located approx 2 foot from the corner.

I have a guitar that I know is in tune
(I used an electric tuner).  I pluck the
open 5th string, which is an A note.
This A note frequency is known to be

I am constructing a family room in my basement (frame construction). I want
to provide some sound insulation between the new room and other parts of the
basement and between the joists before the ceiling drywall goes up.
What kind of products are available for this application? How ...

Friends:
Happy and succesful new year. I need change code (internal swtches) of
a quest M-27 noise dosemeter and reading the manual i can't clear this
item. Cau someone help me?

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Are there any microphones available that can filter out room noise, or
just loud noise, and hear faint sounds? Even something available
which, if pointed in a certain direction, could filter out room noise
to pick up on someone's subvocalizations. If this isn't the right