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Bumpy.. Not to to bite anyone or anything like that, but I do find the recommendations above a bit odd. QRD's are simpler to build for sure, but if the means are there to go with PRD's - why not? The range of scattering both above and below the design frequency is better with PRD's and they need less distance from the listening position. So if practical implementation is a non-issue, I'd wager to say that PRD's are better.
Aside from the odd situations where diffusion in one direction and specular reflections in the other direction is desired.
*edt: this is AFAIK. I'd love to stand corrected if there's anything wrong in my understanding of this!
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