I had the 800x for about 3 hours before I took them back. Until they allow to customize the equalization with the "Advanced Sound Editor" these sound just like the muddy astros. I used a map in call of duty with rain falling down on the buildings. No matter what preset I used, all of that was dampened. I had my XP 7's still connected as well. I put those on, everything was crispy as it should be. The only setting that wasn't over powering in low-end frequencies was the "STEREO" mode Setting, with "BASS AND TREBLE" preset selected. Unfortunately they dont have a "TREBLE" only preset. Now as far as my credibility with hearing various frequencies go. I can clearly hear the super high pitched whine from the wireless. Also, you can hear the harddrive scanning as you go back and forth through the menu pages in the xbox menu. TRY IT!
Bottom line. Unless the advanced sound editor comes back with the ability to tailor the sound, I wont buy another set of beaches.. I will be using Sennheisers with the Turtle Beach XP 7 Controller. when the sound controller breaks, I'll buy them from used ebay...