If your using the VGA or Component cable just need one of
these. If you are using HDMI and your TV has audio out as RCA just need a RCA to female stereo adapter like
this. If it has a 3.5mm audio output just need a 3.5mm extension cable. Even better if you have a receiver for a surround system and it has Dolby Headphone then you can set the 360 to 5.1 plug your headphones into that port and it will simulate surround
sound like the other stereo headsets made specifically for the consoles do.