My setup is this. Apple TV 4K connected to Sony XBR TV via HDMI. The TV is set to output sound to Digital Audio Out. I have the Playbar connected to the TV via Digital Audio Cable. This setup has been working well for the past year. Now I want to add surround to my system. I purchased two Play Ones and connected them as surround speakers to my Playbar. I get very little sound, if any through the surround speakers. I have been researching my connections and options. Of concern is a statement in my Sony manual that says “ If connecting a digital audio system that is compatible with Audio Return Channel (ARC) technology, use HDMI IN 4. If not, an additional connection with DIGITAL AUDIO OUT (OPTICAL) is necessary.” So is this telling me that my Sony is going to require a Digital Audio cable connected to my Apple TV (which, of course, does not exist)? When I check “About my Sonos system” the Playbar is only receiving a stereo signal, but I know I’m playing Dolby 5.1 on my Apple TV. Any help or do I need to return my Play Ones?