can I connect 2 sources directly to power amp (one XLR one RCA)

Depends on a lot of things.  The two sources could fight each other, detecting the other source as noise.

this is what preamps and switches are for.

Does the anthem has a selector switch?  If not, then the two inputs are just parallel connectors to a single input and hooking them both up generally won't work.

I had the same problem with my amp (decware) so I installed a simple selector switch.

Jerry

Never worked, but tried quite awhile back....use a 6in/6out switched patch box to cure the problem.  All rca, but that's what gender benders are for.

You won’t hurt anything,  but it might not work either.  With the Node being on all the time, it will most likely mess with the SQ of the Lumin.  You need something to switch from the Node to the Lumin. 

Can be done on a McIntosh  501 monoblock as they have a switch  which let's one input or the other hook up to it. I was looking at doing this with a McIntosh  tuner and a wadia  cd player for my bedroom.