Hi,
Mostly you get buzing noise from the tutle headset only if you were using play n charge kit, but if you still get buzzing noise even after removing the plug n charge kit from the headphone, it could be due to any one of the following reason....
Try unplugging the charger from your mw2 controller and check whether the buzzing noise is stopped and iif you still face the problem then the wire that connects from your headset to the controller is the issue.Replacing this wire should solve your issue.
To replace this, go to
www.turtlebeach.com and look under accessories and go to replacement parts for the x3 and buy the cable to solve your issue..
If you need further assistance, please leave me comment, and we will solve your issue
Thanks for using FixYa!
Rnj VINODKUMAR