Diffusor Panel Acoustical Soundproofing products and panels

Diffusor Panel
A diffusor panel is more expensive because it is usually more difficult to build and design. There is some difficulty in integrating it into a room. They are rarely found in the average room but are commonly seen in recording studios and high end rooms.
Diffusion vs Absorption
A diffusor panel just absorbs sound waves and a panel as such can be placed wherever the overall room reverberation needs to be reduced and addresses the most damaging reflections. A point is quickly reached in many domestic rooms where no sound is heard. Problematic reflections are addressed by diffusors without absorbing their energy. They are an alternative to sound absorption since they do not remove sound energy but can be effectively used to reduce distinct reflections and echoes. In comparison to a reflective surface which causes reflection of most of the energy, in a diffusor, sound energy will be radiated in many directions. This leads to an acoustic space that is more diffusive. Also it is important that reflections are spread by a diffusor in time and also spatially. Another benefit is that when a small room is treated with diffusion it sounds bigger, while if absorption is used in treating a room there is a tendency of sound to be more controlled till it fades off.
Placement Considerations
You can place absorbers wherever you want in a room but the placement of diffusors is dependent on certain rules.
1. Minimum listening distance
At close range diffusors become inffective. The specific panel decides the minimum distance. Usually there is a requirement of 1m or more but where a wall behind is close to a listening position, a distance of .5m may be allowed by a low profile diffusor panel.
2. The impact of sound waves is reduced if before reaching the diffusor panel they have reflected off many boundaries.
3. Diffusors have a limited effective bandwidth.
4. Don’t overdo it!
Too much diffusion is likely to create imaging confusion.
Types of Diffusors
Mostly there are either 1D or 2D diffusors. QRD (Quadratic Residue Diffusor) is a common example. Since it is one among the simplest it is popular. A 1D QRD works in one direction and is very simple. A 2D QRD works in both directions. The Skyline diffusor is quite similar, which is essentially the same thing without the grid. Quite similar is the Skyline diffusor, which is basically the same thing without the grid.
Confusion over Diffusion!
Some panels are mistaken as dispersers while in fact they could be best described as scatterers. Panels featuring small pyramids or curves are not actual diffusors. More specular reflections are created by curved panels. They are similar to a curved mirror, while an actual diffusor panel is more like a matte painted wall.