I'm having a really hard time with: "Power cable reduced my soundstage"...

chrisoshea.... I certainly will. 

I am a retired Chef with very high standards and know for a fact there is no magic in quality and consistency. You can't fool physics. Chicken is chicken... you can quote me on that! lol

Some good friends of mine are owners/designers of a highly respected vacuum tube amplifier manufacturing company you know.  Not believing all the hokum, I was conducting a personal shootout of power cables on one of their premier amps and found the AQ Hurricane and Tornado to make an attractive audible difference.  the other six or so cords ranging in price up to $4000. didn't make much difference, in this case.  I was a bit surprised and called my friends to discuss.  They actually voice their products extensively while designing them.  "Yes we know" he said, "that's why we put the stock cords on that we do. We found the better cord was audible.  Did you try our cord compared to the Hurricane?"  "Also, you're best to go directly to the wall for power."  I still have the Hurricane, but won't be discarding his stock cord either. 

The wire isn’t ideal, the power source isn’t ideal, the filter caps aren’t ideal. The process of rectification, generates a series of high-current spikes which are made up of a large number of harmonics, in turn generating voltage disturbances which can leak through the very non-ideal filter caps, and perhaps reflect back and forth between the source and load impedance of the system.

Yes- as I stated earlier. I suspect this is why a power cord can affect a product that doesn't draw that much power.

@ roberjerman, a gas pump hose could affect the mileage of a car if the car was running while pumping gas and the hose is narrow in width, taking longer to fill the tank than a wider hose. That’s just the first order potential impact. ;)

@captbeaver- "My McIntosh amp has a permanently attachehed power cable that is a off the shelf product. Is their design faulty? Are they not giving you the full amp? Seems they would know about this magic 4 feet...lol"                                                                              How old is your amp? McIntosh’s current tuner even has an IEC connector, as do all their amps and pres. Was that update because of customer demand, or- have they learned something, perhaps?