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


5% in relation to a stock power cord.

I can’t really trust dealer comments. I am more interested in reports from audiophiles. 
Whats your story? Did you manage to increase speed and resolution of your amp ? (without losses in the bass area)
zuio
Audioquest or no, its quite impossible for a wire in an AC power cord to express any directionality. To do so would be taking on characteristics of a diode as George (+1), kosst (+1) and Al (+1) have all pointed out.

What *is* possible  is that the shield of the cable might be hooked up at one end or the other (as opposed to the ground connection, which is the green wire) which *might* make a difference somehow, and certainly the finished power cord has connectors at either end that tend to make it directional :)

Put another way, its quite possible to hear differences in power cords and to also confirm the differences through simple measurement. OTOH, its quite impossible to hear differences in the direction of AC wiring, and this is easily confirmed by the fact that measurement of such yields a null.

When someone suggests to you that a wire in a power cord has a directional quality, the best plan of action is to turn in the other direction and run as hard as you can.

Since Geoff has discovered this thread, it will no longer suit to continue posting to it or reading it as per usual; snake oil has a highly ephemeral quality and much of it will be applied soon, yielding a similar result as with a directional AC wire.
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!

I didn’t get too many responses to my pop quiz: how many cables and cords are operating in an AC circuit? Why am I not surprised?
🐩
mapman
Pop quiz
Of all the various audio cables and cords which ones are not AC?

Answer: nobody cares.

>>>>I’m afraid that vacuous Amish upbringing is coming back to bite you in the 🍑 You have two ears and one mouth for a reason, Poodleman. 🐩

 Poodleman! He’s everywhere! He’s everywhere! 🐩

"I didn’t get too many responses to my pop quiz: how many cables and cords are operating in an AC circuit? Why am I not surprised?"

I've got this one, the answer is none if the unit is not plugged in.  Thursday and I am already firing on all 8.

I've heard the tiny improvements or worsening of the sound for that matter, in regards to power cords. While I never experimented with the mega buck priced cords, do they offer any real world improvements over more modestly priced cords? It seems to me there is just so much one can do with the AC coming from one's outlets. I suppose I'm just stating the obvious. I'm not an engineer of any variety. lol.