I'm trying to decide between some Beyerdynamics 770's (closed), 880's (semi-closed), and 990's (open) headphones. I will use them at home and at work. It appears that the more open the headphones are, the greater the soundstage, and tighter fidelity.
My concern is that I would be a disturbance to my coworker who sits 10 feet away. He listens to music on his headphones, and I can occasionally hear music on his supra-aural headphones, though by the time it reaches my ears, it is not loud by any means.
At low to moderate volume levels, would the music on a set of open, or semi-open cans, be loud enough to be a disturbance to somebody 10 feet away?