What do I need to monitor in Dolby Atmos with my setup?

[BScout]

Originally Posted by lucienpalmer

No, thats all wrong. Choose between doing MADI or Dante. In this drawing, you are using a Mac for Atmos Mastering with Dante. There would be no point to having MADI at all. Use MADI if you buy a PC based Atmos Mastering unit.

1. You won't need the 128ch Dante card, the current 64 ch card is enough, because the MTRX can only do 64 I/O from pro tools anyway. You will only be capable of 64 channels for Atmos.

I think you missed what he's doing.
He already has an Avid MADI box. He's using the MTRX as a format converter to make that an additional 64 channels going from MADI to Dante to his 64 channels coming from Pro Tools to the MTRX directly. That's why he needs the Dante 128 channel module.

It's a clever idea and will work.
(should mention that this MADI format conversion will impose an additional latency on those channels -- vs the direct from Pro Tools to MTRX channels -- but I think it is under 1ms and probably doesn't matter)