> I have used a similar system. I waterproofed the foam by covering it
> with "Saran Wrap".
Drew,
I put it to the test with a layer of what we call "clingfilm" over my ears=
and I could hear a difference in the higher KHz frequencies. Off the top of=
my head, a 20 micron film is about the same mass as 22mm of air, which is o=
f
the same order as the HF wavelengths involved.
When I hold a sheet of clingfilm beside a small speaker emitting HF hiss, I=
can clearly hear a reflection from the film. Lower frequencies seem
unaffected.
What it does to my directional mics I will have to test when I get a chance=
- my rig is dismantled at present.
The other parameter is when the clingfilm is stretched, when it resonates a=
t
lower frequencies which is a different ballgame.
David Brinicombe
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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