I have a playbar with a toslink splitter, connected to TV on on side and a Chromecast audio dongle with toslink output. This works as a Chromecast workaround however the playbar assumes the Chromecast optical signal is a TV signal. Therefore dialogue enhancement etc is available but the rear speakers in my 5.1 setup only play ambient sound from the audio track. Anyone else tried this or have a way to make it work? I wish Sonos would add an option in the surrounds settings for full range rears from TV like they offer for music That would solve my problem. When linked to more rooms it sounds great on my other stereo pairs, just not in the 5.1 room.