I was not totally clear. My comment was about active noise cancellation. Passive cancellation, such as what you get with protective gear or, as you say, studio

I was not totally clear. My comment was about active noise cancellation. Passive cancellation, such as what you get with protective gear or, as you say, studio monitors, has a nasty side effect I can't tolerate: suddenly, sounds transmitted through bone transmission are much louder (breathing and heartbeat mainly).