Difference b/w RPG Skyline and GIK QRD diffusors

RPG Skyline diffuse in two directions, so you get a hemispheric soundfield around one of these, as opposed to the vertical OR horizontal diffusion, whereby you get a hemicilyndrical soundfield.

As Elizabeth mentioned, the math is publicly available, and you could make this yourself, maybe using wood of a square section close to the RPG section, and cut it to the required lenght. Is not difficult, but it will be time consuming as you'll need a lot of pieces. For the math you can check out the Master Handbook of Acoustics by Alton Everest (I've seen links online to the pdf version, but I do have the book), which is highly recommendable reading anyway if you are getting into acoustics.

Horacio

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.

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