No, the headset will come with its own processing unit for the surround sound so all you will need is the headset and your 360 and you will be good to go.
I was in the same boat as you as I was researching headsets for my son's 360. After reading the reviews, watching the video reviews, and talking to sales people at different stores I decided on the Turtle Beach X31 headset. They are stereo and not surround sound and they are wireless. I was...