Folks, I'm begging you.
Don't make autistic people in public areas listen to your device's noise. It's bad enough at volume when you can hear everything going on but the skzt-skzt-skzt of a low volume can become meltdown worthy. It can't be tuned out and it's rude as hell to force other people to listen to your noise.
Use earbuds or ear phones in public. Don't be a fucking asshole.