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[Video, The Verge] Hear how the best ANC headphones handle real world and lab tests
(www.youtube.com)
This is a most excellent place for technology news and articles.
The interesting thing for me from the tests was showing that anything above 1kHz is just passive noise cancellation. I have acoustics notes from university that are over a decade old that have 1kHz listed as the limit of active noise cancellation and it apparently hasn't been improved in all that time.