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Just about any other Sonos speaker can act as a surround speaker to the Playbar. If you are on S1 then speakers that can connect only to S2 are ruled out. That still leaves you the Play:1, Play:3, Play:5 gen 2 and Sonos One. Oh and at least some Symfonisk speakers.
The issue with the Play:5 gen 1 is that it lacka the 5GHz capability needed for Sonos HT surround sound.