Power cords make a big difference in sound… that is the why. It is best to think about plugging into your outlet as plugging lake, as opposed to plugging into a 14 gauge “hose”. I think the founder of Shunyata uses this analogy. Power does not work like a hose.
Various companies use combinations of insulators and conductors… of various size and composition. Over my 50 years of pursuing high end audio I have had a number of jaw dropping experiences with digital interconnects, speaker cables and power cords.
The most recent when I changed my the cord on my amplifier from an expensive Cardas to a AudioQuest Hurricane. The difference was profound. It did exactly what I needed to the overall tonal balance. The stock cord was well balanced but not as quiet and hindered the dynamics of the music, the Cardas really improved the midrange and bass… but did not improve the details as much… basically tilting the sound towards the too warm side (in most systems this is great). But the Audio Quest equally improved the details… so maintained the balance. The Hurricane was only $1,700… honestly the improvement in my system would have been worth $5K… a good value… as it should be. So, when I can I will be upgrading to the Dragon… I think $5K. I suspect it will be worth the improvement… but I’ll see. Will not happen this year.