Room Acoustic Thread - PART 6

Discussion in 'Studio' started by Sinus Well, Sep 26, 2019.

  1. Sinus Well

    Sinus Well Audiosexual

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    PART 6: CHOOSE THE RIGHT MODULE FOR THE JOB - DIFFUSERS

    In addition to absorbers, there is another concept for improving room acoustics: Diffusers!
    They have a completely different function than porous absorbers and yet serve a similar purpose.
    Sound behaves on a wall like light in a mirror: The angle of incidence corresponds to the angle of reflection.
    When sonicating an untreated room, the sound is strongly reflected at the interfaces.
    The reflection can sound exactly like the direct signal itself, the reflection comes only from another direction.
    There is no clear sound stage and you can not clearly locate the instruments.

    There are several ways to get around this problem: Either by absorption with porous absorbers or by diffusion.
    Especially in listening rooms or studios, it is often not desirable to treat the entire room with insulating materials,
    as this costs a lot of liveliness. It is important to consider in advance what is to be achieved with the diffuser:
    In which frequency range should it act and how much space on the wall or ceiling can it occupy.


    There are different types of diffusers:
    1. 1D-PR-Diffuser
    2. 2D-PR-Diffusor (Skyline)
    3. 1D-QR-Diffuser
    4. 2D-QR-Diffuser
    5. Polycylindrical Diffuser

    Essentially, QR-Diffusers and PR-Diffusers will be discussed here.
    For the sake of completeness, of course, I will also comment on Polycylindrical Diffusers.
    The main difference between Primitive Root (PR) and Quadratic Residue (QR) is the additional partitions (slats) in QR diffusers.
    A 2D-PR-Diffuser looks just like the typical skyline, while a 2D QR diffuser looks more like a solid case with different depths.


    1D and 2D Diffusers:

    1D diffusers are often used on sidewalls and rear walls to keep energy on their horizontal axis. Diffusion up and down
    doesn't take place. The horizontal diffusion closes existing sound holes between the speakers and thus ensures a more
    defined horizontal sound pattern.

    2D diffusers are often used on the ceiling to reflect in 2 axes. This will especially improve the vertical localization of
    phantom sound sources in the mix.

    These are not fixed rules and should not be understood that way!
    Which type of diffuser is used in a particular location really depends on what you want to achieve!



    Please note:
    Finished solutions often consist of lightweight construction materials such as foamed polystyrene. The advantage here is the low weight in overhead mounting.
    However, a diffuser must have a reverberant surface to reflect as broad a frequency spectrum as possible. Wood is particularly suitable for this. It is best to use wood that is not mold-susceptible.





    PRIMITIVE ROOT DIFFUSERS


    1. 1D-PR-DIFFUSER:











    More content is in the making !!!




    <- PART 5
    PART 7 ->


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    Last edited: Oct 2, 2019
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