They're open, so a decent amount of leakage. They sound OK at low volume, but I probably wouldn't get $1300 cans for that.Do the Noire XOs leak much? I do most of my listening with my wife either reading or sleeping by my side; she says that my old HD518s don't bother her, but I can't really make it worse for her.
How do they sound at lower volume? I find that headphones tend to sound better at a volume that unfortunately I can't bear for long, so I'm looking for a pair that doesn't loose too much when I lower the volume.