A pair of speakers (x2) can be set up as stereo sound (left and right channel). You can add a Sonos Sub or Sonos Sub Mini to a pair of these speakers. You can also add a Sonos Soundbar (Arc, Beam, Beam Gen 2, Ray, Playbar) for 5.0 surround sound, or add a Sonos Soundbar and Sonos Sub for 5.1 surround sound.
eBay