I don't recall ever having trouble with this sort of thing before, although when I have in the past tried to reduce "bleep intensity" I have failed.
Now after a OS reinstall, every time I download a file, I immediately have this high level audio signal.
So bad that my wife can't sleep if I happen to be working in an adjacent room.
I use both Opera & Chrome as my browsers & my OS is Win 10.
In the system tray I note my speakers are set at 20% which is fine for listening to audio files. It's also very easy to adjust down.
In know I should not have to ask, but I find that with Win 10 nothing is simple, & to solve most issues I usually have to spend a while Googling. In this case that has not worked, probably too hard to ask the right question.