As I posted earlier in this thread the 141 power cable is shielded with a common mode choke. That is the improvement you are hearing.
Using and unshielded A/C power cable after the power conditioner partially defeats the purpose of the power conditioner, as it allows noise to re-enter.
No, using the Pioneer power cord has nothing to do with what I hear. And as long as you have a well shielded power cord and keep it 2 meters or less there shouldn't be any problem with line noise. Unless of course you put the cord next to a motor or something like that. Matter of fact I space all my cords and cables so non are touching.
Make a quaintly purchase for your entire system. Be really happy as this will save you decades of experimentation and $$$.
Link is dead.
One area where you should experiment is, for three prong gear, ground the shield (third prong) only at one end. To this end I typically use 69 cent cheater plugs from Lowes.
All my power conditioners are fully grounded but typically my gear is not, with the exception of my A/V controller.http://en.wikipedia.org/wiki/Shielded_cable
If your power conditioner is properly zoned then you should not get a ground loop.
And yes as your links points out, if there is a benefit to power cords then use a short run power cord. And imo same goes for any power cord, or cable like a HDMI or interconnect.
Everything can be explained by engineering principle, but in general it takes decades of experience to become wise, as many charlatans want to make a fortune off of you. Don't do what I have done. Remember replacing a poor dirty contact with a brand new cable is not fair. Rather clean the existing cable, and then make the comparison.
Links are dead.
Yes I agree there are a lot of snake oil cables and cords (silver in them, big red flag) out there. And yes I do clean off my cables and cords connectors. The only reason why I do that is because I have a tube amp and use mainly nos (40/60 year old) tubes, so I have the cleaning stuff anyway. But I don't usually keep my hardware for more than 2 years. So in my case any existing cord or cable that comes stock with my equipment is new.
In conclusion, the biggest gain that i see or hear is with audio. And that is mainly why I use a particular type of cable or cord. Of course in the case of my BD-83 or BD-09 used for a source player for both AQ/PQ then the PQ comes into play, so once more you have to make sure that the cable or cord doesn't reduce the PQ at the expense of improving AQ.
The easiest why to understand what a particular cord or cable can do is if you have a good tube amp or something like it and understand the value of tube rolling and how different tubes can make a difference in your AQ.