Power Cords

yes they are, esp on high-quality amps such as yours. the how/why's are perhaps too big a topic right now (do a search for many other prior discussions), but take my word for it, it's not snake oil as some would like to believe.

My suggestion: go to your local audioshop, borrow some and try them against whatever stock chord you now have.

here's a link that might be helpful for you:
http://forum.audiogon.com/cgi-bin/fr.pl?fcabl&1126482002

They are almost necessary over stock cords. Used on the front end has the most effect. Don't ask me why they work, they just do.

I have found PCs to be very system/component dependent. Like I/Cs, they can alter the "sound" of a system. Sometimes not positively. What sounds good here may not sound good there.

Keeping this in mind, if you want the final word in performance from your system, by all means, try them. But be prepared to experiment.