it does depend on the ones you have. The cheap ones are just speakers. I have one of the higher end shoks with audio boost and it feels like it has a little speaker on top of the bone conducting.
if you're in a quiet room and you put them on max and leave it on your desk you'd probably be able to pick out what it's playing. I think at that point though the desk is somewhat becoming a medium for the sound..
Sonic & Chill
I can't stop listening to this specific one, it's been months and everyday I listen to it at work