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.
can I connect 2 sources directly to power amp (one XLR one RCA)
I'm currently running a Lumin D2 direct to the XLR connection on my Anthem MCA 225 GEN 2
would I run into any issues if I simultaneously hook up my bluesound node to the rca inputs?
I'd like to A/B the sources and also use the HDMI on the bluesound for tv