Power cord replacement suggestions

I haven't heard a power cord cause any difference on a source or pre yet--though I haven't done a ton of testing on those two components.  I've heard some fairly large differences on a power amp, but I suspect williewonka is correct.  Even the Argento Flow Master Reference made no difference on my Sanders Magtech when compared to Groneberg Quattro Reference.

I've tried Shunyata Alpha HC (~$1200), Cerious Graphene Blue ($550), Groneberg Quattro Reference ($200), Argento Flow Master Reference (~$6000), Acoustic Zen Tsunami II (~$300).  

I will certainly try the cord on the pre to guage any difference.  If so, i will try the cerious high current cord for the amp. So excited..

I'm late to this thread but my experience is the most dramatic effect was when I replaced the stock cord on my phono pre (EAR 834) with Nordost Blue Heaven. I tried the cord on my int. Amp with no discernable sound improvement.

livin_262002,

If you don't mind me asking, what integrated amplifier did you try the Blue Heaven cable on?

N

Just musing out loud here but hope some worthwhile thoughts.
At what stage do you consider it is worth your time and money to invest in upgraded PC?
I mean there has to be at least a certain level of quality to your system to start with for them to make any discernible difference? Not much point spending $300 on a PC when your disc spinner is worth $250.....

Seriously curious as I do have a fair sum tied up in my system but mostly in components.
Esotric SA-50
BAT VK600SE
ARC LS2
Usher CP-6381
Cardas Quadlink 5c xlr interconnects
Straightwire Octave 2 speaker cable

As the BAT requires 2 x 15a PC, I used the stock cords going to a dedicated 2 way box I made from hospital grade components with a 3 ft whip of 8 gauge cord and a wattgate plug.
All other equipment has maybe $50 PC.

Is it time to follow the White Rabbit down the black hole of PC improvements?