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AjTrek1
AjTrek1Answer
May 19, 2025

As has been said you need two speakers to create surround effects.

The Arc Ultra is designed to produce an Immersive effect when watching movies with Dolby Atmos sound tracks and/or music recorded in Dolby Atmos. It also does equally well with Dolby Digital 5.1 sound. 

The main difference between the Era 300 and Era 100 is that the latter is a stereo speaker. The Era 300 is a Dolby Atmos; as well as a stereo speaker. 

Using the Era 100’s as surrounds the Dolby Atmos effects will all be processed by the Arc Ultra. You’ll still get an immersive effect with the Era 100’s; but not FULL immersion.

Using the Era 300’s you’ll get FULL Dolby Atmos immersion as they will out-put Dolby Atmos effects that are contained in the surround channels of a Dolby Atmos movie thus complementing the Arc Ultra.

Bottom-line

  • If you watch a lot of Dolby Atmos movies typically via movie streaming services, AppleTV and streaming sticks, the Era 300’s are the best choice.
  • If you watch mostly cable TV which is typically stereo and/or Dolby Digital 5.1 the Era 100’s will serve you well.
Together Everyone Achieves More = T.E.A.M.
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15 replies

Airgetlam
Airgetlam
May 19, 2025

Surround set up always requires two speakers. 

Bruce
    BhaskaragAuthor
    Contributor II
    May 19, 2025

    Thank you for the response. Considering the price of the Sono Era 300, is Sono Era 100 also good with the  Sonos Arc Ultra for Surround or ERA 300 is the best considering long term. RooM Size is 25.11 M2

    Stanley_4
    Stanley_4
    Grand Maestro
    May 19, 2025

    I have tried both and if you have the space to properly place the 300s get them. The 100s are not bad by any means but the 300s, particularly on Atmos content are fantastic.

      BhaskaragAuthor
      Contributor II
      May 19, 2025

      Thank you very much for response.

      AjTrek1
      AjTrek1Answer
      May 19, 2025

      As has been said you need two speakers to create surround effects.

      The Arc Ultra is designed to produce an Immersive effect when watching movies with Dolby Atmos sound tracks and/or music recorded in Dolby Atmos. It also does equally well with Dolby Digital 5.1 sound. 

      The main difference between the Era 300 and Era 100 is that the latter is a stereo speaker. The Era 300 is a Dolby Atmos; as well as a stereo speaker. 

      Using the Era 100’s as surrounds the Dolby Atmos effects will all be processed by the Arc Ultra. You’ll still get an immersive effect with the Era 100’s; but not FULL immersion.

      Using the Era 300’s you’ll get FULL Dolby Atmos immersion as they will out-put Dolby Atmos effects that are contained in the surround channels of a Dolby Atmos movie thus complementing the Arc Ultra.

      Bottom-line

      • If you watch a lot of Dolby Atmos movies typically via movie streaming services, AppleTV and streaming sticks, the Era 300’s are the best choice.
      • If you watch mostly cable TV which is typically stereo and/or Dolby Digital 5.1 the Era 100’s will serve you well.
      Together Everyone Achieves More = T.E.A.M.
        Stanley_4
        Stanley_4
        Grand Maestro
        May 19, 2025

        Amazon Music also offers Atmos when played on the TV using the Firestick App.

        Amazing sound with just the Arc, or with 300s or 100s.

        Other sources might also offer something but I don't use them to know.

          Rhonny
          Prodigy III
          May 19, 2025

          Apple Music offers Dolby Atmos whether you use the Sonos app for playback, or the Apple Music app on the TV or Apple TV box, or Airplay from the Apple Music app on a device.

            BhaskaragAuthor
            Contributor II
            May 19, 2025

            Thank you I currently use Apple TV .however do notice sometimes the Sonos app doesn’t show the atmos sign in the phone for some reason

            Rhonny
            Prodigy III
            May 19, 2025

            Because not every track is in Atmos. Many are but a great many more are not. You’ll see Lossless for those. 

              BhaskaragAuthor
              Contributor II
              May 19, 2025

              This issue is more when watching movies the same series shows as atmos some times in app and when  i watch after some time it doesn’t or shows Dolby digital plus

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