Ok, thank you for the explanation.

I did some test changing on the fly the "enable core decoder" option in Roon.
It was strange that the sound doesn't drop while I do the change.

In my opinion the best option should be to unselect ”enable core decoder" and leave the decoding stage to Meridian 218 and the rendering stage to Meridian speaker Special edition, considering they have the MQA decoding and rendering capability inside.

This should be more correct with this configuration? In general I consider the hardware decoding superior that the software decoding.

Gaf