Hello, I am studying in a room. Inside the room is quiet but I hear constant noise from outside traffic and singing birds. Any headphone can remove these kind of sounds completely? I know that the Bose QC-20i cannot remove human voice. How about noise from traffic and birds? If I could eliminate those two noise sources, my room could be complete silent. Thanks.
Edited by miko - 11/2/13 at 11:47pm