Ideal and simple connection

Configuring them as a surround sound system will make them all one room and you never need to configure anything again.  

First, setup the Arc Ultra: https://support.sonos.com/en-us/article/set-up-your-sonos-arc-ultra

Then setup the Amp, adding the Amp to your existing system: https://support.sonos.com/en-us/article/set-up-your-sonos-amp

Then add the Amp as surrounds: https://support.sonos.com/en-us/article/add-surround-speakers-to-a-sonos-home-theater

Then setup the Sub and add it to your Home Theater room: https://support.sonos.com/en-us/article/set-up-your-sonos-sub

Thank you. I will give this a try tomorrow.

jgatie-

I followed the instructions provided and have landed on a system that looks like this:

• Room: TV Room
• Products: Arc Ultra; Amp (as surrounds); Sub 4
• TV connected to Arc Ultra via HDMI.

I get in-ceiling speakers working seamlessly with music; however, not getting sound from them when TV is the source. Have I missed something or is there an easy way to add the in-ceiling speakers when watching TV?

Thanks again.

The TV has to be configured for Dolby Digital output (often called “Bitstream” or “Passthrough”).  Then you must be playing a DD or Atmos source file. On my 2023 Samsung, I have it set to “Auto” and “Passthrough” under Audio > Advanced Settings.

Note:  Surrounds for TV will be very different from surrounds for music streaming from the Sonos app.  Surrounds for TV give atmospherics and/or directional effects and will not be playing at all times.  Surrounds for music just repeat the stereo R/L channels. 

Also note:  For sources, choose something like Disney+ to test Atmos.  Other sources require an upgrade (Netflix, Max, Prime) for Atmos.  Avoid YouTube videos to test audio.  Even if they are marked Dolby Digital or Atmos, they are really 2.0 stereo because YouTube converts all free videos to stereo to save space.

Many thanks for the advice.

I have the same problem, but an older Playbase as Center, L,R, a Sub 2, and A new Amp just purchased from Best Buy, compatible with ceiling surround speakers.  For example, I can separate my Amp with connected speakers and play music on them from Amazon Prime.  I never hear anything from my surround speakers when I add the Amp to my Theatre System.  When playing my television, the source would begin at Netflix, Amazon Prime, Disney, etc., go to my television over the Internet, from the TV to my Playbase via a fiber optic cable.  The output on television is set to Dolby Surround.  I assume the Playbase isn’t sending the rear surround signal to the Amp, as the Sub (2) works fine. I have tried all wired, then changed to wi-fi while leaving the Ethernet connected, no difference. Did you ever receive a response from support?  I am not sure what happened to Sonos support, but unfortunately, it isn’t exactly what it once was. I have spent hours and gotten nowhere, explaining the same things repeatedly. 

I don’t think the Playbase supports Amp for surrounds. 
 

When you try to Add Surrounds, is the Amp an option?

Yes.  

I stand corrected! 
 

When you stream music from Spotify, Amazon or other source do the rear speakers play sound?

Are you sure the Playbase is receiving a DD signal? Not all programs are transmitted in more than stereo/DD 2.0

Edited to add:

If you select the room, what is shown as the input signal format - it’s to the far right of the “SPDIF” data? 

When I was using the test Movies using Amazon Streaming, it stated, “Dolby Digital 5.1.” If I switch from Amazon streaming to watching a podcast or the news on YouTube, it is Dolby Digital 2.0.  I don’t need surround sound on the news or podcasts, and I don’t think YouTube broadcasts in “Dolby Digital 5.1”