Two Phantoms as rear AV channels (bypass Dialog)

[ogs]

I think the only way to use them Solo in this setting is to use the optical input of the Phantoms (if you can find a way to separate the channels). If they are networked, Spark will be confused. I had a discussion with Devialet support on this some time ago. You'll have to network (ethernet) one Phantom, set it up with Spark - enable optical and set volume - then disconnect it and connect the other one and do the same. After a power cycle you'll have to do the same - for the volume anyway. The optical setting may be remembered
NOTE: This is theory as I have not tested the procedure.

Edit: Which USB-to-Optical converter is it?