Mathematically modeled sound attenuating / absorbing metamaterial.

[maxxevv]

Interesting possibilities with regards to room acoustics treatment in the future.

https://www.mnn.com/green-tech/rese...Ed-g7KIQnUeV-IIIwnukJnlvQbbVgRhpHJvS3rdK0-WRU

 

[pierre]

Associated paper can be found here: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.024302

 

[bigx5murf]

Would it make good speaker cabinet material?

 

[andreasmaaan]

Would it make good speaker cabinet material?

I suspect it would not be ideal as a cabinet material in its own right, as it would vibrate and potentially produce sound itself (although this is just a hunch based on its apparent weight and density - I can't find anything in the links discussing this).

Moreover (and I don't have access to the full article to confirm this) it seems that the material needs to be tuned to a specific frequency. It isn't a broadband absorber but rather a narrowband one that is extremely effective, but only in a very specific frequency range.

Perhaps if anyone has full text access they can confirm this?

 

[VMAT4]

From what I read it reflects sound back to the source.

 

[BillH]

Unfortunately the fractional bandwidth is only approximately 1/10 the center frequency. ( Fig 3)
Their demo is at 430 Hz but the attenuation is less than 100 Hz FWHM
On the flip side, the device dimensions are deeply subwavelength which makes it nice for low frequency resonance control from ducts and other mechanical systems.

 

[rocknss]

From what I read it reflects sound back to the source.

Correct

But the best part? The material not only strips the sound of the air, it sends it back where it came from.

I remember reading about acoustic diode years ago, this might be ideal for a listening room though haven't heard much on it in recent years.
https://www.popsci.com/science/arti...-travel-one-way-opens-door-true-soundproofing