I’m shocked no one talks about what brand wire to use between the outlet and the breaker box. Why no discussion about audiophile breakers? There is discussion about fuses within the components, why not on the breaker box?
Why no discussion about the material in the main breaker box supplying the whole rail?
Point is that 10, 20, 30 maybe 100 feet of common garbage wire is between your outlet and the breaker. For many those wires may even travel along other wires for appliances and other devices making tons of electric noise.
And you think 3 feet of $$$$ wire from wall to components will make a difference?
You would have to try hard to find a power cord worse than the junk in your walls going to the mains.
Just food for thought.