Do router and ethernet cables affect sound quality?

Two years of quasi lockdown have triggered the urge in me to test most of the audio voodoo (and triggered many looks from the missus)
Actually I was surprised that I could hear deltas with a lot of items tested - f.e. speaker cables and interconnects. Of course also with different amps and DACs.
But note to myself, in case the Vladimirkron Variant will ground us later in 2022 and I get Testitis again:
The 3 things in 2020 and 2021 that did really absolutely nothing / absolutely zero for me:

  • High End Ethernet Cables (yet still using my Audioquest Vodkas in all systems)
  • Power Management / Filter - the black did not become blacker
  • SBooster LPS on Lumin U1 - the band did not get tighter nor the stage any bigger
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