This works for me quite well - qc20 running whitenoisefree - https://itunes.apple.com/us/app/white-noise-free-sounds-for/id292987597?mt=8 https://itunes.apple.c

This works for me quite well - qc20 running whitenoisefree - https://itunes.apple.com/us/app/white-noise-free-sounds-for/id292987597?mt=8 https://itunes.apple.com/us/app/white-noise-free-sounds-for/... using "brown noise" and "grey noise" mix, running quiet. However, now that I'm reading other comments, I'm wondering if it's still a concentration breaker like others are saying. I def don't feel I can concentrate as much as I did a year ago, but I've got literally 3x as much work as I used to have, so I can't really tell if it's the noise or just too much on my mind... :/ Been wanting to try the QC30, but reviews indicate the noise cancelling is less than the QC20, not more.