I have a question about backsound because playing anything pass hdmi arc in beam 2 on tv direct or spotify app on tv (by wifi works ok 5.1 music) on spain only works in one channel that transmit in DOLBY atmos it is TVE HD in my 2 sonos one sl back its on.
I think a stereo signal must be converted by every channel to be audible in back in every case.
it is possible?