If the amp has a switch changing the input from RCA, to XLR, most likely it will be fine.
If both RCA and XLR are fully connected 100% of the time on the amp, then not a good idea.
The signal from one source will go back to the other source, and that usually is bad for the turned off souurce output devices...
If both RCA and XLR are fully connected 100% of the time on the amp, then not a good idea.
The signal from one source will go back to the other source, and that usually is bad for the turned off souurce output devices...