Follow these steps to connect your audio/video devices to the your system:
Connect all of your audio/video devices (i.e. cable box, DVD player, game system) to the available inputs on your TV
Alternate connection method
If your TV does not have enough inputs for you audio/video devices or if you are unable to get sound after turning off the TV speakers, you can connect up to three devices directly to your Bose system with three different audio cables.
For example, connect your DVD player to the Bose system with an optical cable, connect your cable box with a digital coaxial cable and connect a game system with an analag audio cable.
Note: For this setup to work, only one device can be turned on at a time.