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Originally Posted by Flo Fandango  |
Funny ain't it, I got the opposite view from the same thread!
Bear in mind, (I think) that the question was not definitively answered. I would, for example, much prefer a specific quote from the cox book on the question. AFAICT the 'source' that it's best to have a series of repeated QRDs comes from the dutch site, and tbh I'm not sure he is the definitive source.
Quote:
Originally Posted by Flo Fandango Additional question: if I make instead of 4-5 diffusors with 7 prime a single one, but repeating the pattern of prime 7? Are there differences? Of course, it will be repeated like I would repeat 4 or 5 panels.
Flo Fandango |
Don't quite understand, I thought that was your intention from the first post?
Also, I must repeat that I am not an expert in any way shape or form, and the last thing I want to do is perpetuate 'internet lore'. That was part of the intent of my thread, to sort the wheat from the chaff.
Regarding the repeat, then the 'rules' for avoiding repetition apply, as laid out in the thread.
A couple of questions...6'7" ceiling?? That is not a misprint? Boy, low ceiling!! Anyway, why have you only got a two foot height to play with for the qrd?
Second, as the room is so small, you need to be able to be at a sufficient distance so the wavefront from the diffusors 'blend', the general rule is three times the lowest wavelength, and for imperial I think the formula is 1130/frequency (????). For the design of Flow=430, that equates to roughly 8 feet. (check all my numbers there)
I don't think your room is big enough to support that.
The other design allows a lesser distance as the Flow is higher, but even then you may be struggling? Both have the same depth, so I guess that indicates the 'depth advantage' that a prime seven gives.
If they were the only two options, then as I came to a different conclusion than you did regarding the repeat or larger prime question, I would go with the higher prime. It should give more complex scattering and temporal signiture, and allow you to be closer to it.
But might be best to wait for more expert advice than to take mine!