Last place I worked at had one big room that was a couple hundred feet square, and they had the noise generators cranked up so high that you couldn't successfully have a conversation with someone unless they were within about five feet of you. When I'd walk outside, it was a physical relief from the onslaught of white noise.
https://mynoise.net is great for this. There are loads of sound generators for different environments, each of which has sliders for each frequency. I sometimes use it when I have trouble falling asleep (I pin the site to my homepage on Android Chrome).