Below is link to a previous Agon discussion about how well-designed power cables can change and improve the sound of an audio system. My thoughts are in short that it has less to do with the power supplies and more to do with stewardship of the currents and fields in the proximity of your gear, and effectively reducing interference with low current processed signals in interconnects and speaker wires, I.E. keeping the big juice in the pipe.
https://forum.audiogon.com/discussions/why-power-cable-effect-overall-syste-sound
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https://forum.audiogon.com/discussions/why-power-cable-effect-overall-syste-sound
Preview