Okay, the speakers still doesn't like me. Now L&R doesn't wake up, nor is the SW.

I have set the Master to Centre, and slaves for both L & R. Speakers are all connected via SL onto the allocated slots as mapped.

I have used the MSR to match the Meridian Config.

If I set the Master to the Left speaker, I have all the speakers except the DSW.

Previously when all set to Master and interestingly the right speaker was also Left Master, everything works except the volume is not in sync.

The rears seems to be fine.

Lounge: 861v8 with ID41, 218, UHD722, Sonos Connect Wyred4Sound, AppleTV, Oppo 105, DSP8000SE, DSP5200SE
Streaming: Roon/Spotify
Currently not in use: DSP5200 x 2 pairs, DSP5200HC, DSP3200, 218 x 2, MS600, DSW x 2, MC200, Sonos Connect Wyred4Sound