Sadly, the reply to that query is not any. The Sonos Period 300 can solely connect with Sonos tech from Gen 2 or later, such because the Arc or the Beam. It’s because the Period 300’s multichannel rear speaker design is constructed to assist Dolby Atmos, one thing you may solely get in Gen 2 onward. The Sonos Playbar and Playbase, then again, are Gen 1 tech, which implies they do not have the total tech specs essential to assist the Period 300. For those who attempt to join them, it merely is not going to occur.
By the way, this assist hiccup additionally applies to the lower-end Sonos Period 100 speaker. Whereas the Period 100 will not be outfitted with Dolby Atmos, it is nonetheless too new to correctly interface with both the Playbar or Playbase. Nevertheless, the Period 100 can join with any technology of the Beam speaker, even when it is Gen 1, alongside the Sonos Ray and Arc. For those who’ve bought an older Beam speaker, it’s possible you’ll wish to choose up a few Period 100s in lieu of the Period 300 to make sure full and correct connectivity.
As for the Playbar and Playbase, there may be sadly no option to facilitate a connection between them and an Period 300 or 100. In equity, the unique Playbar has been round for a decade now, with the Playbase only some years behind, so it was solely a matter of time earlier than the 2 reached their sundown years.