The same reason as for the MP-50 (not supported by Lyngdorf). Choose another connection, like HDMI for example, that supports multichannel audio – but as it is a surround sound processor, don’t expected it to accept DSD from a source that’s not a properly licensed SACD/DVD/BD-player (AFAIK you’re stuck with PCM playback but Roon is able to do the conversion for you). Further reads:
