Difference b/w RPG Skyline and GIK QRD diffusors

Thanks,
I know about the DIY RPG project, but can't really picture myself going through the tedious process of cutting 156 pieces of wood for each panel,and then gluing them to the board, and I need four of them.
Lewinskih01, thanks a lot for your explanation, very helpful.
I suspected it to be similar. Here is the question: since the listening position is at the fixed height, the limited vertical dispersion of the QRD panel should not be that critical. I wonder, what I would actually hear with QRD panels vs. Skylines???
Shadorne,
I understand your point, but I'm not an author of this design, Rives Audio is, and since I decided to use them, I would like to follow their design to a letter. I doubt, I know more about room acoustics, then Rives does.

Maril,

I fully understand your point and if I were in your shoes I would probably do the same. Can you ask Rives what the difference would be?

Nevertheless I agree with Shadorne. To me that's an unusual spot for QRD diffusion and Shadorne is telling you how these are usually implemented, including the recommendations in Everest's and in Toole's books.

Come to think about it, maybe you can do us a favor and ask Rives why they chose QRD in that spot and post what they answer. Rives knows their stuff and maybe we learn something.

BTW: good move contracting Rives. Which level did you select? I'd be interested in the results.

Actually Rives specified Skylines on the front wall, and nor QRD. There also some diffusion on the ceiling and side walls at first refl..points. And , of course, a lot of bass trapping.

Maril,

The term QRD means quadratic root diffusor and refers to the math behind the calculation of these. I understand the Skyline is a QRD, but I realize it's confusing when there are commercially available products called QRD, like the GIK you asked about. Sorry my thread was ambiguous.

Diffusion in 1st reflection points on the side walls and on the ceiling (likely another 1st reflection point), is not uncommon. I would still be interested in understanding why Rives recommended diffusion on the front wall.

Horacio

RPG does make QRD panels as well, but Skylines are NOT QRD design.
I will try to ask Rives about it.