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 I have a pair of One SL, the arc and the sub (gen3) all connected and working together. My question is if I replace the pair One SL with the in ceiling speakers with it be compatible and plays well with the other devices? Also would the amp be necessary at this point? 
 

thank you 

If you’re not using the Sonos Amp, what is powering the ceiling speakers? How are they both receiving and playing the surround sound?

If you power them with a Sonos Amp, then it should all work, although there are many who suggest surround speakers should be at ear level.