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Since
entering the acoustics arena in the
seventies, we have heard many stories
over and over. One of these is that the
acoustic foams are no more than a fancy
packaged version of egg cartons.
After
listening to this many times, I decided
to include them to be tested with some
commercial products at Riverbank
Acoustical Laboratories. I recently
discovered these in my "attic" files and
have reproduced them here.
Egg
Cartons do, indeed, have acoustical
value. They measure NRC = 0.40.
However, the graph tells the rest of the
story. While commercial products exhibit
a smooth curve, there is a "pothole" in
the acoustical road with egg cartons.
Another thing to consider is
flammability. Take an egg carton outside
and put a match to it! Then
ask yourself, "Do I still want this on
my studio walls?" |
