The CITATION MultiBeam 1100 can only be expanded with CITATION SURROUND speakers, and the CITATION SUB (S). 

Additional information

Unfortunately, you cannot pair any stand-alone CITATION speakers (ONE/100/200/300/500with your soundbar in order to watch TV. It is possible, however, to place your soundbar in a group together with other CITATION speakers (using the Google Home app) and then simultaneously cast audio to all devices that have been added to this group. All speakers that support Google casting can be added to a Google Home-app group.