Here is the main reasons to use the Benchmark brand Xlr to Rca adapters,
SPECIAL WIRING TO REDUCE HUM AND INTERFERENCE:
Back-referenced audio ground - for common-mode rejection
Star-quad conductors - for magnetic immunity
Dedicated shield connection - for immunity to ground loop problems
RCA center pin to star-quad + to XLR pin 2
RCA ring to star-quad - to XLR pin 3
RCA ring to shield braid to XLR pin 1
These are also the most cost effective product on the market that I have seen and used.
Kenny.