Dante, Atmos and Arvus H1-D

[Yondu]

Do you think it makes a big different to HT to have all Phantom Is? I’m thinking I could get away with the centre and surrounds being Phantom II Customs…

I think the center needs to be phantom 1.  You can get away with phantom 2 customs for the remaining channels.  I have Phantom 1's for L/C/R and Phantom 2's for surround and am happy with that configuration.  The only downside with mixing models is that there will be a latency discrepancy between the phantom 1 and phantom 2 which may cause some issues with surround and atmos mixes.  I'm compensating for the latency issues with a symetrix.  i have the JBL send its output to the symetrix and then to the phantoms.

Phantom I needs to be configured with the "direct optical mode" with Devialet Dantestick https://stilus.ch/en/item/dante-stick;400623 (dante to optical converter) and Phantom II needs to be the custom version (built in Dante/AES67). In this case Dante network will manage latency with the (Dante/AES67) Dolby/DTS decoder. As Dante is a clock based network, latency will be the same on each product so without issues while decoding. They explained it here : https://www.devialet.com/en-gb/professio...ter-seven/  
Devialet has presented this solution many times in pro and consumer tradeshows, ISE in Barcelona, Cedia in the USA, PAVS in France and probably more that I don't know.
Here : 
https://www.youtube.com/watch?v=nngHoVyM...Y2VkaWE%3D
or
https://www.youtube.com/watch?v=cxQBM-KF...Y2VkaWE%3D