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

Oops forgot the dc pwr cables powering my Network devices.

Any frequency other than zero Hz is AC, in that the direction of the current alternates at some rate. Digital signals and analog audio signals both contain a mix of many non-zero frequency components that are simultaneously present. Certain digital signals may have a significant DC component in addition to their AC frequency components, an example being USB signals which have one of their two voltage states at or near zero, and the other at some positive voltage. 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.

Regards,
-- Al

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.