Это личный опыт использования наушников Bluedio T4S Active

2. The ANC does not actually function properly. I can hear all the humming from the fans in the video rack as if I was wearing a regular set of head phones. There is no difference. The volume of the music does turn way down once the ANC option is turned on but that is the only difference. This makes these headphones useless for me.

Terrible audio quality. I’m not even a very snobby person when it comes to sound, but this is terrible. Also 100% not noise cancelling. Put them on and could hear my tiny little desk fan blowing air on low speed. Don’t buy. Will be looking to return these.

They do not cancel any sound AT ALL. I have had regular over-the-ear headphones that would block more sound passively. Do not recommend at all.

ANC is very bad, it amplifies the surrounding sounds and reduces bass even further. I tried it in a public place, I could hear people talking with ANC turned on! I tried it on the train to see if the train's screeching sound is reduced, it actually was louder with ANC.

Обман. Система шумоподавления не работает. Она просто убирает низы и вообще странно меняет звук, но никак не убирает внешние шумы по любой из частей спектра.