config question for dual mono

[audio_engr]

By the way, my config is exactly as shown in the screeen shot above. Everything else is turned off except for my Ethernet, digital chain, and speakers.

Thats my config too ... for 440-Pro CI. But with a small twist ... 

1. I downloaded the Master file and called it "master-left". 
2. I then made my speakers L to R in that same Master diagram, AND activate the AES/EBU input and downloaded the file as "master-right".
That eradicates any devialet config errors and makes sure you have your Dual-Mono as exact Left & Right identicals.

Daniel is an expert on this ...