[kmfrk]

Earbuds can do that; the audio "sounds" low to you, but you're only perceiving the delta between the device volume and environment noise. That's why I stopped using earbuds; when I would put my hand to my earbuds, the volume would shoot up from isolating the environment noise, and I got an idea of how loud my device actually was.

I recommend noise-cancelling earphones, because they deal with the delta problem for the most part; but you can obviously still run into the problem of setting and forgetting the volume, which is fine for one thing but too loud for something else.