Can you get "audiophile" sound using a native RP4 USB port into a DAC?

[lolli8]

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.....BTW: In a german forum I read that someone heard a difference between the direction of an ethernet cable...

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Well of course. The  digits get used to going one way and doing that will make them all go back to front.

And I am sure for Australia you need a different cable because everything is upside down.    
Plus I hope they took the coriolis force into account, too, because this also has an effect which shouldn't be underestimated. I am sure a different type of shielding is needed because the electrons in the cable are pushed into a different direction while being on the Southern part of the earth, so you need the exact opposite type of asymmetric cables they use for the Northern part in really, really expensive cables.