Ok, it is most obvious with headphones but...can be listened to with 5.1 speakers when I twist them up a bit. The noise is there yet when I entirely turn down sound. Particularly, noticeable with World of Warcraft...although is not there constantly. I can be playing Wow and its well, then I tab out to check something on my desktop and when I reply in its there, clicking away. Mostly sounds like a replicating click. No phones near by either... No idea.