> >> >  For example, I once saw a room with cardboard
> >> >  egg cartons stapled to the walls.  It deadened the sound surprising=
ly well,
> >> >  although it wasn't like a professional sound studio.  Multiple thin=
 sheets
> >> >  of cloth with a little separation between them takes space but are
> >> >  relatively cheap.
> > That surprises me, from my experience it is how well the material
> > absorbs the sound is the most important factor, eg just having carpet
> > in a room significantly reduces the reverberation. The surface of the
> > studio acoustic foam is in an egg box shape to aid with frequencies
> > the foam struggles to absorb so is secondary function.
> >
> > Egg boxes ability to absorb is limited so most freq pass straight
> > through (with a little attenuation) and are still reflected of the
>=20
> I think egg boxes are used also to soundproof as well as deaden sound -

The mashed up paper construction will absorb a certain amount of sound, the=
 'dimpled' effect on the wall to a planar wavefront breaks up the wavefront=
, and then any reflection within the 'dimples' means that any reflection is=
 out of phase with the planar wavefront.

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