Natural Science Forum / Physics / Acoustics / July 2008

Folks,
People often ask which affordable microphones I recommend for measuring
their room. To answer this question I tested ten popular microphones ranging
from an inexpensive DIY model to a Josephson with Microtech Gefell capsule

I'd like to know if there is a way (or some kind of guide) to define
the duration of environmental noise measurement (how long to measure)
as a funciton of noise parameters such as: LAeq, SPL, L99, L90, L10,
L1...?

Hi,  I've been looking into purchasing a starter pistol to use as a
noise source for reverb time measurements.  I've discovered that there
are many different guns that shoot blanks on the market, and I'm not
sure what would be appropriate for this application.  Does anyone have

I am looking for fabrics that have both acoustical blocking and absorption
properties.  I would like to make drapes for some windows to block out a low
level of noise.
I don't want to use acoustical foam or some such thing.  I want a decent-looking

What is the minimum height of point source above the ground if I set
K0 as 0 to simulate the spherical radiation? Thanks.