Placebo or not I upgraded from good quality cat 6 cables from my modem to my router and another from my router to my Sim 380 dac. I upgraded to Audioquest Vodka a .5 meter from the modem to router and a 3 meter cable from the router to my Sim dac. There is a noticeable improvement and it's easy to test by just changing the cables back. All I can say that perhaps it's black magic but I can do the swap out with other people here and they hear the same improvement.
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