If aftermarket premium power cords work, why won’t short runs of premium XLR cables work?


I have followed many threads, where people swear premium power cables greatly benefit your sound.  I haven’t decided, as the last time I tried a power cable was twenty years ago.  I used a Transparent power cord and was on the fence.  If adding a power cable improves the sound and it’s only the last few feet of your voltage source, what would make extending a premium XLR cable any different?  If I understand the argument, per se, the premium power cord acts as a filter.   XLR cables are mostly unsupcetable to outside interference.   I’m sure I will be versed here one way or the other.
handymann
One of the advantages of a proper balanced (differential) circuit is that it minimizes the interaction with the balanced interconnect cable and makes it much less critical.
See the power cord discussion (posted on the Galen Carol website) by Caelin Gabriel of Shunyata Research. It addresses a few of the widely held beliefs and assumptions about power cords. I found it helpful.

I’m not clear on your question re PCs vs balanced ICs, so can’t help there. Sorry.

https://www.gcaudio.com/tips-tricks/why-power-cables-make-a-difference/


XLR cables are easily extended, if the source supports the balanced standard. If not, its a bit of a crap shoot.
More on this:
http://www.atma-sphere.com/Resources/balanced.php