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Moose6864
Contributor I
June 9, 2026
Answered

Home Theater system

i recently purchased the sonos arc ultra and era300 speakers to create a home theater system when grouped together i get sound from the arc speaker and one of the era 300 the right rear but no sound from the left, if i disconnect all of them from the grouping i get sound out of all of them but loose dolby atomos effect

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Moose6864Answer
Contributor I
June 10, 2026

Speaking with sonos support, they have found that the one Era 300 speaker has the region as UK, while the rest are US, so it won't connect to the system. Waiting on tech support for a solution. 

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Stanley_4
Stanley_4
Grand Maestro
June 10, 2026

Do you have a music service that offers Dolby test tracks, 5.1 as well as Atmos? Amazon does, others too.

Try using them instead of YouTube where you can't really trust the claims or tracks.

AjTrek1
AjTrek1
June 10, 2026

I set it up the arc ultra first then added the era 300s as far i understood when using it in the home theater mode i assigned which one is right and left and the app put them in as rear speakers i just labeled them right and left so it knows the position to send the sound to either right or left rears

What do you mean you labeled them right and left so “IT” knows where to send sound to rears? What is the “IT” you are referring to?

My understanding is that the arc ultra is the brains of the home theater system, when I refer to front right and left front speaker it is the sound coming from the arc ultra either left side of it or the right side of it. The rears are the era 300 one on the right side the other on the side of my couch. 

Finally….

You’re overthinking this. Once the surrounds and maybe a sub are setup the Arc Ultra knows where to send the sound based upon the source material. Labeling is only for your benefit. If you are not getting sound to a surround it may because the source momentarily didn’t have any to provide or there is a fault with the setup.

Bottom-line if the sound not reaching a surround is constant and the source has a surround track your best option is to run a diagnostic within 10 minutes of the occurrence, make note of the reference ID and call Sonos Tech Support to analyze the data. Do not publish the  reference ID in the community

Together Everyone Achieves More = T.E.A.M.
    jgatie
    jgatie
    June 10, 2026

    Using a YouTube video to test a surround setup is basically useless.  Unless you have a premium subscription and are playing premium content, YouTube videos are downgraded to stereo 2.0 upon upload.  Even if they are labeled as “DD 5.1” or “ Dolby Atmos”, it’s still stereo 2.0.  

      Moose6864Author
      Contributor I
      June 10, 2026

      I set it up the arc ultra first then added the era 300s as far i understood when using it in the home theater mode i assigned which one is right and left and the app put them in as rear speakers i just labeled them right and left so it knows the position to send the sound to either right or left rears

      What do you mean you labeled them right and left so “IT” knows where to send sound to rears? What is the “IT” you are referring to?

      My understanding is that the arc ultra is the brains of the home theater system, when I refer to front right and left front speaker it is the sound coming from the arc ultra either left side of it or the right side of it. The rears are the era 300 one on the right side the other on the side of my couch. 

      Finally….

      You’re overthinking this. Once the surrounds and maybe a sub are setup the Arc Ultra knows where to send the sound based upon the source material. Labeling is only for your benefit. If you are not getting sound to a surround it may because the source momentarily didn’t have any to provide or there is a fault with the setup.

      Bottom-line if the sound not reaching a surround is constant and the source has a surround track your best option is to run a diagnostic within 10 minutes of the occurrence, make note of the reference ID and call Sonos Tech Support to analyze the data. Do not publish the  reference ID in the community

      Thank you 

        Moose6864Author
        Contributor I
        June 10, 2026

        Using a YouTube video to test a surround setup is basically useless.  Unless you have a premium subscription and are playing premium content, YouTube videos are downgraded to stereo 2.0 upon upload.  Even if they are labeled as “DD 5.1” or “ Dolby Atmos”, it’s still stereo 2.0.  

        I do have the premium, now using Amazon prime watching top gun maverick was told that is a good test for the system getting good from the ultra and right rear era 300 nothing from left rear though 

        AjTrek1
        AjTrek1
        June 10, 2026

        Using a YouTube video to test a surround setup is basically useless.  Unless you have a premium subscription and are playing premium content, YouTube videos are downgraded to stereo 2.0 upon upload.  Even if they are labeled as “DD 5.1” or “ Dolby Atmos”, it’s still stereo 2.0.  

        I do have the premium, now using Amazon prime watching top gun maverick was told that is a good test for the system getting good from the ultra and right rear era 300 nothing from left rear though 

        OK…run the diagnostic and call Sonos Tech Support.

        Together Everyone Achieves More = T.E.A.M.
          Moose6864AuthorAnswer
          Contributor I
          June 10, 2026

          Speaking with sonos support, they have found that the one Era 300 speaker has the region as UK, while the rest are US, so it won't connect to the system. Waiting on tech support for a solution. 

            Stanley_4
            Stanley_4
            Grand Maestro
            June 10, 2026

            Regions: That is one of the things we users can't see and have very little information about.

            Shouldn't (not can't) be an issue with new purchases but it can be a surprise if shopping the used market.

              AjTrek1
              AjTrek1
              June 10, 2026

              Speaking with sonos support, they have found that the one Era 300 speaker has the region as UK, while the rest are US, so it won't connect to the system. Waiting on tech support for a solution. 

              Wow… you could have been doing something more constructive 19 hours ago had you taken the advice of ​@Airgetlam rather spending time going back ‘n forth in this thread. 😂

              However, all’s well that ends well. Enjoy your Sonos once you get the correct speaker 👍

              Together Everyone Achieves More = T.E.A.M.
                Moose6864Author
                Contributor I
                June 10, 2026

                Regions: That is one of the things we users can't see and have very little information about.

                Shouldn't (not can't) be an issue with new purchases but it can be a surprise if shopping the used market.

                I agree and that is a valid point, it's a good thing that it was purchased through the sonos store and I was able to provide them the PO# or I would be having a hard time getting it replaced. Interestingly the serial number indicates that it is a US version for some reason UK region though

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