Is it like white noise? Because I have the same problem on the Xbox 360. I don't really notice it for the PC though. Doesn't really distract me that much when I'm playing bl-ops or something.
I'm working on a problem with my turtle beaches right now about pressure applied to your outer ear and causing damage. If you want to give me feedback, fill out this survey.
Headphone Fatigue Survey
Thanks, I hope you fix your beaches, and continue to pwn unsuspecting noobs.