@mbolek Being as though the XS-5500s already have gold plated red copper connectors, I do not see any sound improvement in going to Viborg's red cooper rhodium plated plugs. I have Viborg's XLR and RCA connectors with rhodium plating which are solid but I think that red cooper with any plating will produce the same sound to "my ears".
If you are going to swap connectors, I would look toward OCC connectors for the sound improvement but now we are talking double the money for that slight incremental step towards your audio nirvana. With that money, I would put it on a fuse upgrade vs a connector upgrade since the existing connectors are of good quality. My $.02.
Please report back with your findings because this is how we all learn and begin to experiment.