I prefer a pink noise myself.

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).

frosted flakes mentioned pink noise; i recommend brown and/or grey noise. it really depends on the type of noise you're trying to counter, but these really helped me a lot with various types of road noise and lawnmower-style noise. pink, to my ears, is a bit thin/tinny, and doesn't assist much with my trigger points.