Why Can't I Hear Myself In My Turtle Beach Stealth 600 Xbox?

To access the Devices and Accessories menu, go to Settings >> All Settings >> Kinect & Devices >> Devices & Accessories. You will see an image of the controller you are now using; if you scroll to the right, you should be able to view additional devices that are being used in conjunction with the Console. This item, referred to simply as "Headset," will be included in the list.