Thanks for posting! Am I correct in assuming that you'd like to play the audio from your TV on the Wave Music System? If so, it should be possible.
If your TV has a headphone socket and you don't want your TV's speakers to play at the same time as the Wave, a standard 3.5mm stereo male-to-male cable will do the trick. The connector on both ends of the cable is the third from the left in this image.
If there's anything else I can do to assist, please let me know.