RCA happens to be a standard for home equipment. There is quite a number of amps with great specs and RCA inputs available on the market.
It is indeed unfortunate that it is prolific in home audio. The issue here is specific to the fact that with a balanced input if you put the conversion to RCA at the amp you will still suffer a problem that can be easily avoided.
Having screen connected to the RCA low at the amp means that any ground currents from the source will flow in that signal wire (the whole ground loop issue and fundamental flaw in single ended RCA). If the balance screen is connected to RCA low at the far source end those currents flow harmlessly in the screen wire and not the signal wire. This is achieved by a simple XLR to RCA cable. It is also precisely what Hypex recommend.
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