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Fuses themselves do NOT affect sound."
Oh yes, they most certainly do.
If you can't hear a difference, there are probably several reasons for that.
First would probably be because you've never tried one.
Do you think thousands and thousands of audiophiles would keep buying expensive fuses if they didn't do anything?
If they didn't do anything, I would ask for my money back.
I don't care if you buy expensive fuses or not....but who are you to tell me what I can or can't hear through my system?