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Did... no one read the article before upvoting? This can reduce specific frequency sounds by -12db, NOT 94% of "sound". Can /u/dang or someone edit this clickbait title? The wavelength of 100hz is 56.5 feet. While it may be possible that these rings can attenuate specific high frequencies, they don't [and cannot] reduce all sound in general. To say otherwise would be to defy physics. Assuming the rings aren't vaporware, they could work for specific, constant higher frequency sound sources, like machine hums as mentioned in the article. However, the rings' aesthetic would be useless inside of an MRI machine... There is a reason existing sound barriers aren't open, because even regular walls block high frequencies. (And not just specific ones that match to a ring's size). The best way to kill frequencies are thick objects (like walls). For a room (like a editing studio or recording booth), it should have a non-symmetrical wall with various recessed spaces to function as sound baffles, at the least. And lastly, these would be completely useless for low frequencies. |
These metamerial, interference based approaches, are not going to be broadband by the standards of physical acoustics.
This could be useful for helping cancel a particular harmonic of a helmholtz resonator.
The real question, to me, is does it still work at high transitional Reynolds numbers, or under full turbulent flow?
Source: End effects during transitional and turbulent flow for Helmholtz resonators (i.e. bass reflex ports) in high output pro-sound loudspeakers has been something I've played around with in the past.