can't add sub to arc

The sound is really echo ish not at all what I expect 

Maybe you have put the Arc and the surrounds in two “rooms” in the app and “grouped” them? That would result in an echo.

Ok, that makes sense, but when I set it up, it always asks me which room and I always say the same room, app says adding to room, then added 🤷🏻‍♂️

But you are right, they do appear to be in separate rooms but how on earth do I solve that? 

Is this normal if they are in the same room

Unpair your stereo pair in Living Room, and put one into each of 2 new rooms called Temp1 and Temp2. Then go to the remaining Living Room - with the Arc. Select add surrounds, and you should be offered Temp1 and Temp2.   

If you group rooms and have tv as the source, there will always be a delay in the room(s) other than the one with the tv connected. That’s the echo effect you could hear with your incorrectly configured setup. 

Thank you, I was told to do this earlier, I did it, went through the process ok, then the app showed this 

Yep, definitely, that is exactly what is happening but I’m powerless to get it working any other way

Factory reset the Eras. Then add them to your system, assigning them to the temp rooms. Then add surrounds to the Arc.