So I am looking to buy a new headset for gaming. I will mainly be playing PC, but I also use my PS3 for COD quite often. I was looking into three headsets, the Steelseries Siberia V2, the Tritton Pro+ and the Tritton 720+. The main thing I noticed was that the Tritton Headsets use Optical Digital to put game audio from the PS3 through to the headset, while the steelseries one uses RCA (red and white) to transfer audio to the headset.... So I ask you guys, what IS the difference between Optical Digital and RCA Audio?