[LAU] New 'acoustic metamaterial' cancels sound

[Jörn Nettingsmeier]

On 3/8/19 8:46 PM, Jörn Nettingsmeier wrote:
> On 3/7/19 8:49 PM, David W. Jones wrote:
>> https://www.sciencedaily.com/releases/2019/03/190307103109.htm
>>
>> Might make managing sound a bit easier in studios?
> 
> 
> If your biggest worry is annoying the neighbours with your studio 
> exhaust pipe, then definitely yes.


Jokes aside, I'm trying to wrap my head around this one:

"By comparing sound levels with and without the metamaterial fastened in 
place, the team found that they could silence nearly all -- 94 percent 
to be exact -- of the noise, making the sounds emanating from the 
loudspeaker imperceptible to the human ear."

Let's assume that percentage refers to sound pressure level, not 
spectral width. Is it reasonable to expect something like 24dB damping 
in a narrow band? That would be really nice, but not amazing.
Yet, if it's a high pitched noise they're battling, that probably 
translates to "still very annoying".
Those evil log scales, here's why the press likes percentages better. 
Unfortunately, our senses don't care.

-- 
Jörn Nettingsmeier
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