Gus

thinner diffuser article
« on: March 16, 2019, 09:02:25 AM »
Would the exposed flat surface area over the different chamber inlet openings be more reflective than the older design because of more surface area?

Has this been done before?

https://phys.org/news/2017-06-diffuser-ten-thinner.html



moamps

Re: thinner diffuser article
« Reply #1 on: March 17, 2019, 09:06:00 AM »
It looks that it is efficient in a very narrow frequency range. I would like to see a chart of absorption in whole audio spectrum.  I'm not optimistic.
Has this been done before?
Maybe.
http://www.lydogakustikk.no/schroeder-diffuser-using-a-metasurface-new-idea/?lang=nb

Gus

Re: thinner diffuser article
« Reply #2 on: March 17, 2019, 09:37:31 AM »
moamps

Thank you for the link.
I often wonder if papers about "new" discoveries that people publish might have been done before .

JohnRoberts

Re: thinner diffuser article
« Reply #3 on: March 17, 2019, 10:18:36 AM »
moamps

Thank you for the link.
I often wonder if papers about "new" discoveries that people publish might have been done before .
The ancients are constantly stealing our new ideas.

The other question is does it really work as claimed for general applications.

JR
Visit https://circularscience.com to hear what properly "cleared" drums sound like.

abbey road d enfer

Re: thinner diffuser article
« Reply #4 on: March 21, 2019, 01:30:27 AM »
Would the exposed flat surface area over the different chamber inlet openings be more reflective than the older design because of more surface area?
I would say, to me, it's not a Schroeder, it's a scattered Helmoltz. Schroeder is based on closed-pipe resonance that depends only on length. Helmoltz is based on a mass of air resonating against the compliance of a volume.
One of the possible drawbacks is that the wave-speed in the aperture reaches the turbulence speed, where the resonator is so damped it doesn't do anything good. That would limit the range of useful SPL.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

gyraf

Re: thinner diffuser article
« Reply #5 on: March 21, 2019, 06:44:39 AM »
Note that the article says it "works". Nothing about how well it works.

I call BS for research-grant-nutrition

Jakob E.
..note to self: don't let Harman run your company..

volker

Re: thinner diffuser article
« Reply #6 on: March 21, 2019, 10:01:53 AM »


 

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