thewas
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The quarter wavelength is an extreme ideal, in such a concentric design also close to 1/2 a wavelength works quite well as I will show below. Also it should be considered that the distance of the perimetric lower mid drivers to the central driver should be considered which should in the order of 220 mm and thus around 1/3 of the wavelenght of 500 Hz.Those 5” midrange are not close enough to each other (1/4 wavelength), so if they are playing 500hz and above (even with a 500hz crossover they still play higher frequencies) then there will be comb filtering.
Below I have simulated exemplarily such a five 5" drivers in a 500 x 500 mm enclosure configuration and as it can be seen there are no significant lobing issues in the interested frequency region up to 500 Hz, the whole behaves like a huge single lower midrange driver with some very nice controlled directivity down to below 200 Hz only without the problems that such a driver would have:
Unfortunately people with half-knowledge and full-selfoverestimation but no significant experience with simulations and real measurements tend often to underestimate others, even the state of the art R&D and engineering from companies like Genelec.I didn't think about the original argument of @thewas because it was obviously shelled out as a defense by aggression.
In my book the whole thread is hilarious anyway. And now Genelec dared to ask for comments ... I only remember the pretty lame response to KEF's white paper on the R / meta series. All so excited, but (nearly?) nobody referrenced the content, let alone critically. Could it be that the audience here is a bit overrated in regard to technological insight?
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