I have that issue with many appliances. Both the washer and drier in my house buzz so loud when they are done I'm surprised my neighbors 2-3 apartments away have not complained.

Also have that issue with MacOS!!!! If you have headphones on (so volume not zero) and you need to reboot it will Chime out loud via the build in speakers. that sound does not go through the headphones period. So you're sitting near someone sleeping and for some reason you need to reboot and PPPPPPOOOOOOOOOOOOOONNNNNN! Thanks Apple! >:(

I'd prefer to just disable it 100%. Maybe some mac guru knows how. You have to remember to set the volume to zero before you reboot. Maybe Apple should make iOS and iPad OS also have startup sounds just to be consistently annoying.