An “acoustic metamaterial” that can cancel 94 percent of sound

Re:An “acoustic metamaterial” that can cancel 94 percent of ... by fulafel on Saturday March 09, 2019 @02:49AM (#19345013)

The article mentions on one hand a high pitched note, but on another hand enough bass to see the subwoofers play it:

"Standing in the room, based on your sense of hearing alone, you’d never know that the loudspeaker was blasting an irritatingly high-pitched note. If, however, you peered into the PVC pipe, you would see the loudspeaker’s subwoofers thrumming away."

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Re:An “acoustic metamaterial” that can cancel 94 percent of ... by tmikaeld on Saturday March 09, 2019 @02:52AM (#19345016)

I assumed that this was the interviewers observation and not a fact, because even a mid-range driver would be moving visibly.

Considering the size of the tube, this is certainly not a driver big enough to go to lower frequencies.

(Specialized drivers at 4" can go down to 25hz though)

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