Instructions
Navigate through the PlayStation 3 main menu with the thumbsticks on the PS3 controller. When selecting items on a given menu, press "X." To go back from a selected screen, or to cancel a process, press "Circle."
Select the "Settings" menu. Scroll down to the "Accessory Settings" option, then select "Audio Device Settings."
Select the "Output Device" option. Set this to "Wireless Headset," then select "OK" to confirm and save this setting.