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Re:What I Know About Being Sick at Work (2018) by wool_gather on Sunday July 21, 2019 @01:46PM (#20492565)
> leaves a noticeable low level of noise

That's not added sound, though, that's a portion of the original sound that just didn't get cancelled.

Re:What I Know About Being Sick at Work (2018) by sokoloff on Sunday July 21, 2019 @02:28PM (#20492848)
The likelihood that it’s 100.0% original sound and 0.0% imperfect opposing waves is extraordinarily low.