Ear Force X1 - FAQs
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Connecting the Xbox 
Use the included cables to connect the headphones, Xbox and TV or sound
system. This will allow you to hear the Xbox with either the TV or the X1 
headphones.

Step 1:
  Connect the Xbox audio cables (red/white) to the X1 splitter

Step 2:
  Connect the X1 splitter cable (red/white) to TV audio input (red/white)

Step 3:
  Connect the X1 green 1/8" jack to the 1/8" input on the splitter cable.

Step 4:
  Connect the X1 USB/Power jack to an open USB port on the Xbox 360. Use the
  included USB extension cable if necessary.
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