[uptheoctave]

One disadvantage of doing it using the MTRX on one Digilink port and the Symphony on the other is you cannot integrate Symphony into the MTRX's monitor controller.

I forget with the Symphony, does it act as a standalone converter, maybe analogue to AES, like the Rosetta's could?
If so you could connect the two MTRX's digilink connections to the HDX card and go AES from the Symphony into the MTRX.

Or put a Dante card in the Symphony and connect it to the MTRX that way.