Thank you for your inquiry. The SoundTouch 520 system was engineered to be an all-in-one home-theater system. You will not be able to add additional outdoor speakers for listening to TV/Movies. However, you can certainly stream SoundTouch music services to additional SoundTouch speakers, either outdoors or in different rooms! If you're interested in this, I'd recommend the SoundTouch SA-5 Amplifier with a set of outdoor speakers.
Please let us know if you have any additional questions!