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A comment on An “acoustic metamaterial” that can cancel 94 percent of sound. Parent comment

Re:An “acoustic metamaterial” that can cancel 94 percent of ... by porker on Saturday March 09, 2019 @07:14AM (#19345778)
How about for lower frequencies: motorways, busy roads (no individual car noises; a solid background roar)? They make having the window open here a nightmare.
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Re:An “acoustic metamaterial” that can cancel 94 percent of ... by jfries on Saturday March 09, 2019 @09:20AM (#19346203)
Isn't this exactly when active noise cancelling works the best?
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