Romazicon, I have 2 URH power cords and 2 PRO power cords.
The Pro's are better at everything but how to describe this..
Of coarse, each step up is more refined but the Pro's are a bigger increase than previous upgrades. In my experience, on my system,
the sense of "magic" increases dramatically. A uncanny feeling of being there at the show. Pro had better bass, more imaging, smoother highs,
more tone and involvement, ect.
About where to put the Pro power cord.
I would try it in different places but my guess would be going into the
power distribution. or into the AMP. I may have cheated by having a Pro in both places so the power goes thru 8 MC-0.5s and 2 Pro PC before the amp.
Note: I have ALL waveguides on Starsound Brass "Audiopoints" instead of the rubber rings. I get more intimacy this way.
I actually have had ALL waveguides on Star Sound Technologies platforms and all components on Starsound Racks.
My new PRO speaker waveguides are so long (30 inches) that I will have to use two "Apprentice" platforms on either side. Or 2 Star Sound speaker stands per side. So just AUDIO points on speaker cable for now. The Pro speaker cable is a tube of super magnets with hook up wires at either end. ;-)