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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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Airgetlam
Airgetlam
June 10, 2026

It isn’t, to my knowledge, possible to set up three separate ‘front’ home theater speakers using the Sonos software. You either have the choice of a soundbar, which has separate right, center and left channels, or you can use a Sonos Amp to drive front right and front left, and have it generate a faux center channel.

Can you explain how you did this?

Bruce
AjTrek1
AjTrek1
June 10, 2026

​@Moose6864 

Sorry…your explanation doesn’t track. You need to tell us what three (3) speakers you are supposedly using across the front for your Home Theater.

Once again a Sonos home theater only consists of a Soundbar in front, two spears as surrounds in the rear and a sub positioned where it produces the best low-end in a room. Anything else is incorrect using the Sonos app.

Together Everyone Achieves More = T.E.A.M.
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

Moose6864Author
Contributor I
June 10, 2026

​@Moose6864 

Sorry…your explanation doesn’t track. You need to tell us what three (3) speakers you are supposedly using across the front for your Home Theater.

Once again a Sonos home theater only consists of a Soundbar in front, two spears as surrounds in the rear and a sub positioned where it produces the best low-end in a room. Anything else is incorrect using the Sonos app.

I have the arc ultra and two era300's

Mr. T
Mr. T
June 10, 2026

 

Your screenshot evidences you had the Era 300s as rear surrounds. 

If you are going to test your system, first make sure the source you are using is in fact providing the correct audio format. Majority of YouTube videos will provide stereo regardless of what the video is titled.

In addition, by removing the Era 300s as surrounds and grouping them with your Arc Ultra, there will then be a min 75ms delay on the audio from the Era 300s and they will play a stereo down mix of the overall audio being played on the Arc Ultra.

    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?

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

    So, if I’m reading the situation correctly, you have a front right, front center, and front left signal being sent to your Arc Ultra. You’ve ‘grouped’ a stereo pair of Era 300s and called them Right and Left (names that Sonos doesn’t care about, they’re just there for users to identify). 

    I’m somewhat surprised that you’re not hearing the 75ms delay between the Home Theater room (the Arc Ultra) and the grouped second room (your Era 300s).

    Bruce
    Airgetlam
    Airgetlam
    June 10, 2026

    Sorry, ​@AjTrek1 , I will let you continue. 

    Bruce
    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. 

    AjTrek1
    AjTrek1
    June 10, 2026

     

    Together Everyone Achieves More = T.E.A.M.
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