I had Elecraft install my KRX3 and KXV3 and all seems to be operating well in as much as I've tested.
One thing I do notice though is that the main rx audio seems to drop significantly in the left headphone channel when I turn on the sub rx. After continuing to play around, it appears there is not a real decrease--at least not a significant one--but a perceived decrease because I'm hearing in one ear only. (Yes, my left ear hears as well as my right.) I can crank up the main rx AF but am thinking the basic Orion approach with the main rx in both ears and the sub rx in the right ear has advantages.
Gary W7TEA
73,
Gary W7TEA K3 #1001, #5763