Of course, I am not disagreeing with you in any sense. My point was simply that tying two chassis together won't always work for various reasons, for example, even if you tie them so well that there is only 1 micro volt difference in potential between the two, it does not mean that every point in the two devices that are connected to "ground" have the same potential as there are always resistance and/or impedance (tons of caps everywhere...) between two points. So, the better way is to try and determine where the loop is in the signal path itself and break the path(s).
I got fixated on RCA to XLR because that's the title of your thread lol.., and I thought you focused on the right solution right from the beginning, that is again, break the ground loop currents in the signal path itself. It does not make doing it that way will eliminate ground loops, but it should eliminate, or more precisely, reduce the ground current flow in the signal path itself enough such that the hum will not be audible form your closest seats. Ground loop seems like a very fascinating topic as people typically have a lot to say about it when they see such posts.
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