It could be a number of things causing this. Do you notice this only with this blu-ray? How does other material sound from the listening position as well as at your ear directly to the tweeter? What does it sound like a hiss/buzz or more "scratchy" sounding. What are you powering your system with and how loud are you listening (to rule out distortion from receiver clipping).

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne