Every time this question is asked, there are far too many wrong answers given—again and again.
For the two-millionth time:
Don't use an RCA-to-XLR adapter plug.
Don't use single conductor shielded cable.
Do follow the recommendation of the guy who has spent four decades trying to educate people on how to eliminate hum and buzz in their audio equipment:
View attachment 417557
If you can't find a properly constructed cable, make them yourself. If you must buy a pre-made cable, make sure that you disassemble the connectors and
examine both the connection layout and the quality of the workmanship of the assembly.