New power cord needed for speaker with powered subwoofer?

used power cords hold their value a long time, and some are quite inexpensive to begin with,  so really no risk here...

Prof,

I have a vivid imagination, but when comes to music and things aural, I have a pretty good ear.

I’ve fallen for the bait, haven’t I?!

rvpiano,

I have a vivid imagination, but when comes to music and things aural, I have a pretty good ear.

Then you are well placed to do a blind test.  Of course no one is forcing you to and I don't mean to at all.  What I'm saying is that you are asking if an upscale power cable will perform better than the supplied cable.  If you really want to know, you could try a cable with a return policy and do a shoot out.  Blind testing AC cables are one of the easier tests one can do (in terms of casual home tests).

I've done it before, was easy with a pal swapping them, and the results were quite educational. 

I saved quite a bit of money ;-)

@rvpiano lol!, our biases are quite strong, run a test like @prof is suggesting. You may be surprised at the result. Remember to run the experiment few times.