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G.4 Diffusers
A diffuser provides diffuse reflection of the sound radiated against it.
It can be a very useful solution in cases where reflections are disturbing
the sound image and it is not advisory to add further absorption. So in
order to reduce flutter echoes, comb filtering etc., special elements
can be placed on the "disturbing" surface. These elements must have
dimensions comparable to the frequencies at which diffusion is wanted.
Often bookshelves stocked with books of irregular sizes and/or music
collections (LP's or CD's) can act as non-ideal diffuser, if dedicated
diffuser devices cannot be used.
G.4.1 Absorption or Diffusion ?
A special technique developed by Manfred Schroeder is very capable
in making a smooth and controlled diffusion. These diffusers normally
referred to as "Schroeder Diffusers" can be found as readily made modules.
G.4.2 Absorbers
All materials in the room act acoustically even if they are not specially designed acoustical materials. In domestic
situations we have generally two types of absorbers.
G.4.2.1 Membrane absorbers
This kind of absorber includes wooden floors, windows, doors, etc. This absorber provides absorption in the low
end of the frequency range. The efficiency is normally not very high, but under normal conditions large areas are
included in the basic room construction. Special designed membrane absorbers can be very effective. Placing a
wood laminate floor on suitable acoustic backing can provide one such absorber.
Schroeder type Diffusor