Hi,

Just to confirm that the AC200 works fine with legacy products, I have mine attached to a DSP5000 (smiley face) pair via a 'Reviver" and all works fine. It also works with DSP33, although I had to connect the comms in to the out port on the DSP33 (usual trick with the DSP33).
I wonder if the same thing might have some effect with your situation?

I haven't tried a sub on that system.

Brian

Main: G65, MD600 Sooloos, MC200 Roon Core, MS600, 210, 218, UHD722, DSP5200SE, DSP5200HCSE, M6 & DSW.2
System 2: AC200 MS200, WiiM Pro+, M6.
Other: DSP5000 (96/24v1), DSP3300.