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Hi, new to Sonos Home Theater and Home Theater in General.

I am building a house where the 65” television will be in a space that is 20’ wide by about 20’ deep with a 15’ flat ceiling.  The rear of the space opposite the television is the kitchen so the actual room is much deeper.  The furniture used for television watching (sofa and chairs) will be arranged in a U shape approximately 15’ x 15’ to rear of sofa’s and chairs within the larger living area space.  The floor will be tile with throw rugs.  There is a large glass sliding door on one of the side walls.  My question is whether the Sonos Arc Ultra Home Theater setup will work well within such a larger volume.  Will there be undesirable echo’s, will the 15’ ceilings be a problem?  With the planned furniture layout the rear speakers will have to be place in the rear corners of living area space, or about 20 feet to rear and off to the side of the television on cabinets or small table. Will this be a problem?

We have a Roku television, it does have a eArc HDMI port, and has a really simple easy to use remote.  Regarding simplicity my partner requires it, so anything not simple will be vetoed.  Does the Sonos Home Theater system detect the television being turned on and just work, or is the app required to make it work every time?

Other question about Sonos in general.  I have a couple older One SL’s and plan to put them in the dining room in a stereo setup.  Can Sono’s play music only, say from Spotify, on the home theater setup without the television being on?  And further, can I easily “connect” all Sono’s speakers together to play the same music at once, say for a party?

Appreciate any thoughts….

The space i have my Arc Ultra, Sub 4 and Era-100s in is larger and we have a sloped ceiling averaging about your height. The system works well to fill the space, the up firing Atmos drivers are set up a bit in volume but seem to provide decent height audio.

I'd place the surrounds just to the rear of the primary listening positions.

The system plays streaming audio without the TV being on or plays audio from the TV, both sound quite good. I do like the Amazon app's lyrics and images display when I'm listening, streaming is used when I'm not paying g that much attention, reading, napping or such.

The system will power on and configure for TV watching by default. 

You can Group all or some of your Sonos to stream music perfectly. Grouping to a TV source leaves the Grouped Sonos with a slight, 75 ms delay. Usually not a problem unless the two are pretty close.

The glass might react to the Sub if played loud, more a quality issue for the glass than Sonos as any system would see the same issues. Here a thermal curtain was enough to tame vibrations/resonance issues that I saw at louder listening levels.

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