Adding a 3-cm layer on earphones isn’t really that feasible… I’ll take it as “still years ahead before any commercial product with this tech comes to market”

Very interesting - this should like it should cover more territory than ANC

This is cool! I hope it makes it into the mass market.

wow

"At the moment, you can either use materials that absorb or scatter noise, such as earplugs or foam mattresses. Or you can have active noise cancellation that works by creating a signal that destructively interferes with the one you want to get rid of. The problem with both of those approaches is that they don’t work for all frequencies or only work for steady signals, like the constant or continuous hum of an engine or air-conditioning unit. "

BS. Passive isolation works for all frequencies. Yes the attenuation is frequency dependent, but that ain’t the same as it not working.