Are these actually active noise cancelling, or even noise cancelling at all?
Their list price is only 30 dollars.
I thought to be noise cancelling, there had to be a microphone that listened to background noise and a circuit that reversed the noise and simultaneously played it through the speakers or earphones.
It's not just on this shlocky website that I see the term used to mean, afaict, "fills your ear canal so the noise can't get it". Or do they do more than that.
Thanks.