Read the manual, read the manual, read the manual. Make sure you understand types. If you don't, experiment and re-read the manual.

Meridian kit is unlike most hifi. You need to understand how to map logical functions onto physical functions; ie logical sources on MSR with physical inputs on rear or logical 5.1 audio with physical speaker analogue/digital outputs on the rear. Likewise DSP settings are different for different inputs, or between music and movies for the same source.

Once the penny drops, it's all quite simple and logical, but if you are not thinking the Meridian way, you won't get it.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).