I've been thinking about your phantom source.

If the source is from the 218 then you will only be able to achieve stereo. My reason for thinking this is that you can only have one input on the 218. If you play Soooloos\Roon you are using the network input. You cannot simultaneously input audio fro the Speakaerlink in so nothing can come back from the processor. On the G65 you should make the DSP stereo only for the 218/Sooloos source.

If you want to play Sooloos/Roon in Trifield for non mqa material you should have the MC200 attached to the 65 as before and give it it's own source button and set the DSP modes that you want to use with it.

Cheers
Tom

Main: G61SL, 218, HD621, 2*7200SE, 7200HCSE, M6s, DSW, Apple TV 4K, NUC (Roon server)
Secondary: Wiim Pro, 3200, Audio Core 200
F80