In article , Dave Plowman (News)
scribeth thus
In article ,
tony sayer wrote:
That's modifying the acoustic. A barrier to prevent sound transmission
generally needs mass. Of course if you're using a double skinned one,
some form of treatment between the two may reduce resonances.


Yes quite but was just to point out theres differing aspects to noise
reduction;!...

Yes - but most want wideband noise reduction. A mineral wool might help at
highish frequencies, but not all. Adding mass should be good for
everything.


Dunno .. Its all part of the same problem. We have just lined a radio
studio from the hard walled construction the results now internal from
outside sources are a lot better as if you think about it the sound has
to travel thru the absorber and then reflects off the hard dense surface
then travels back thru the absorbent material again etc. Reducing it
every step of the way.
--
Tony Sayer