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Can you build a home theater system with four sonos era 300 speakers (two in the front and two in the rear?)

No, a soundbar is required for the front L/C/R. ERA speakers can then be used as surrounds.


So what’s a small soundbar with Atmos I can use? (Space is an issue for the front)


The Beam can interpret Atmos, and send it to the surrounds. However, it does not have the Atmos upward firing speakers that the Arc does. 


You can only add two Eras (as rears) to a Sonos surround system.