A:Answer Hello,
Thank you for your inquiry! The Bose 321 Series II was engineered to be an all-in-one home entertainment system. It will not be possible to add the SoundTouch 300 soundbar as an additional speaker for TV shows, movies, etc. However, by connecting the SoundTouch Wireless Link adapter to your 321's available AUX input, you will be able to stream SoundTouch music sources and/or Bluetooth audio to both the SoundTouch 300 soundbar and your 321 system at the same time. We hope this helps!