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

An Ansuz D-TC power cord did just what lak mentioned above with my Aavik U300. Because of that I can play almost twice as loud. I never would have believed it if I didn't hear it in my home. Not sure what percentage of improvement I got but would say it was lot. If I have to guess I would say 20 - 30%.
Yes it's crazy expensive too. Full List is 20K for 2M

I substituted the power cords that came with my Merrill Audio Veritas monos with Shunyata Pythons and the noise floor,resolution,along with a more natural rendering of the music... did take a turn for the better. Great fit in my system!

5% gain is quite a bit to expect with any pwr cord change from just a stock thick gauge cord.
I’ve been using upgraded cords for a long time,generally make my own,and without question they do lwr the noise floor,have better defined dynamics,and are generally smoother and more refined across the board.

I’ve owned many class d amps and I found that with all of them,they like being powered up all the time.My latest amp a Lyngdorf 2170 definitely likes being left on,not on standby,all the time for the very best in sound and also is ready to go at any time.

I recommend that you try a reasonable priced cord and listen for yourself and compare to a stock cord.

Kenny.

It's impossible to answer the question because there's no way to quantify this mysterious 5%

I would submit that changing out the amp power cord while leaving in the stock power cables of all other components, will probably have little benefit.

 Nothing mysterious...

100% - 2 times more resolution, like a new component (unreal)
50% - outstanding upgrade
25% - really good upgrade
10% - good upgrade
5% -  noticeable improvement
under 5% - 100 AB Tests needed to find a difference.