Can a power cord increase the resolution of an Class D (SMPS) amp by more than 5% ?

Al,

“But a signal having both DC and AC components is nevertheless "operating in an AC circuit," it seems to me. 


So the only audio-related cables I can think of which are "not operating in an AC circuit" are cables conducting the outputs of DC power supplies that are external to the component being powered.”

This is how I have always understood this too but I may be wrong or missing something also.

As always Thank’s for your well explained statements,
Kenny.

I have a Primare I32. It came with a 5' cord that looks like 16 AWG at most. It is a bit loose at the amp side and pulled almost taught when I have the amp where I want it. I bought a 6' 14 AWG copper cord to resolve these issues. I didn't hear a noticeable difference; but as regards the noise floor, it is inaudible with either cord. 

The sound system is on a dedicated 15 A circuit wired with 12 AWG.

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Odd!

Oh, brother, one of the A Boys checks in with his usual failure to grasp the whole directionality thing. Doesn’t any one of the electronics EE pretend gurus even understand what directionality is?

Once again, we have an amp manufacturer who never got the memo regarding advanced fuses, fuse directionality or wire directionality, including HDMI, Digital Cable and power cords. I have one word: hyper circuit focused!

Man that’s some thick sarcasm if I’m interpreting it correctly, but if indeed you are being sarcastic, Bravo to you! Anyone claiming directionality in a conductor made of 99% pure copper or silver is selling snake oil. Absolute nonsense. 

And to answer your (poorly worded) quiz - MOST signals on audio cables are AC - hence destroying the stupid "directionality" argument. LOL.