Jan 4, 2016
The SoundTouch 120 and 130 home theater systems are complete out-of-box home theater solutions. They do not offer a way to attach extra speakers as part of the surround-sound playback for that system. There have been no plans announced for a feature of this sort which would allow for rear speakers on those systems.
Additional speakers in the SoundTouch family can be used to stream synchronized music from the the SoundTouch along with a 120 system. This will allow for multi-room playback. Bluetooth speakers such as the SoundLink mini cannot be used for this purpose.
Jun 2, 2016
Compatible wireless speakers all have "SoundTouch" in the name. To list a few:
Dec 12, 2016
Dec 13, 2016
We can confirm that the SoundTouch 120 is a standalone system for home theater and is not designed to add additional surround speakers to it. You can, however, add other SoundTouch products in other rooms for multi-zone music listening that is controlled by your mobile phone, tablet or computer through the SoundTouch app.