Stereo sound not working via line-in, but only for DVD sound? Hi all - thanks in advance for any help!I have two Sonos Fives in my living room, set up as a stereo pair. They play music wirelessly just fine, working as a stereo pair. The right-hand one also has a line-in connected. It connects to a CD/DVD player (it’s an OPPO BDP-103EU BDP-103EU Blu-ray player, in case that’s relevant). The line-in connects to the back socket of the right-hand Sonos Five, and runs down and splits into the red and white inputs to the player. When I play CDs from the player, the two Sonos Fives work fine as a stereo pair, with both playing fine. But when I play DVDs from the player, the stereo sound does not work: it seems to me that only the left-hand Sonos Five seems to work, and the right-hand one (i.e. the one that receives the line-in) is not playing any sound, so that e.g. some dialogue from the film is not played, or e.g. the instrumental parts of film songs play but not the vocal parts of those songs.Because the line-in seems to work fine when I play CDs via
