Replacing power with cleaner power matters in audio and you can hear the difference. Yes even replacing router and switch power supply to quieter . Heard it myself. Good enough proof for me. My system never have sounded this good.Dealing with those signals let us go to the moon. Allowed us to decode the human genome. Let's us fairly accurately predict weather. Take pictures of distant galaxies. Carry an always-connected combination GPS + computer + telephony device in your pocket. Little things like that.
Its not a flaw in the designs of my products(apple tv 4k being one of those i heard improvement to, relating to the big companys you mentioned) its just how the physical laws of electricity with audio works.
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