@Lyer25, That's what I thought of too. I think this would be like the opposite of vantablack actually (vantawhite? There's a wheel of fortune joke in there somewhere). Vantablack absorbs essentially all visible light, whereas this acoustic material seems to reflect all audible frequencies (kind of like white objects reflect visible light).
Haha, didn't notice SoupRKnowva'd posted the link before my comment. Looks really cool! Curious to see how people manage to use this for hobbyist applications.
It's likely a quarter wavelength resonant tube that due to the fancy muffler might work on several frequencies. Doubtful that it will 'block' broadband sound.
Yep, below a certain frequency it's nearly all transmitted. At a certain frequency there is attenuation of 32dB and past that it's 2dB. The innovation is that it is much smaller then the usual acoustic cavitiy and the structure is very open.
It can be tuned to certain frequencies so you can probably make several and stack them to increase the frequency band.
More interested in something for open cans that keeps the soundstage & air, but would block the music from disturbing coworkers. And absorbs or greatly attenuates vs. reflecting.
But this could certainly be used for subwoofer tuning.
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