I have and it didn't work with my SS mono amps when both XLR and RCA inputs were connected to 2 different preamps. The volume was severely attenuated ... my amp is not balanced design so it's a pseudo XLR. I doubt it's in user manual so just try it out.
Is there a problem w/ using both amp inputs?
I would like to connect my Berkeley Alpha DAC directly to my Levinson ML336 via balanced input. And for other analog sources, connect my BAT VK51se pre to the ML336 via the single ended inputs. Would this create any problems with both inputs connected at the same time? Has anyone tried this?