When placing 1 of my buds against an SPL meter set weighted A/fast when using the cascade masking sound... I measure a minimum of 65 db.
Most of the sounds are too quite for me, or have too much variation in the frequencies. I normally use my air purifier as a white noise genrator along with Quies earplugs, but has little effect against percusive/impact noise from neighbours... hence bying the Bose buds.
There does need to be more sound options in the library.
hope my information helps with a fault diagnosis