In my opinion, a good center speaker is essential for listening to Dolby Atmos material and, in general, for surround sound. Sonos should add speakers on the front to reinforce those frequencies that are noticeably weak compared to the rear Era 300. Listening to music in Dolby Atmos is a pleasure, but in the Sonos configuration I have (Arc Ultra-Sub3-Era 300 x2) it often still loses out to a good stereo system due to this lack of power and definition in the center speaker. Let's get to work, Sonos! Greetings!