I used to mow lawns growing up. Would listen to headphones to drown out the mower. 30 years later I essentially hear this 24/7: www.youtube.com/watch?v=D96_1AsUajA My wife (and everyone else who knows me) knows my general hearing is bad, but not horribly so, and much worse in noisy situations. There are times when I don’t hear that tone as much, but it’s there every morning when I wake up and it’s quiet.

Also, at max volume, I had to hold the phone speaker on my ear to make sure it was even playing.

Frequencies above 6k-7k have disappeared/are always there.

Do yourself a favor and take advantage of noise-canceling headphones so you can keep the volume down.