how can a line cord affect frequency response ?

Eldartford,
I'm glad that you are looking at ways that could advance what we know about testing audio products, and making those tests as relevant as possible to the real-world operating conditions of the products.

I feel that doing those kinds of tests, and even coming up with newer test protocols to accomplish this would get us further toward the truth about what we test and hear.

While I've been accused by others(not you) of being "unscientific", I actually have no beef with science. I only want the tests to be as accurate as possible in determining the outcome, so that we can ensure as far as possible that no incorrect conclusions are drawn from the tests, as has happened in the past.

My aims are to reveal as much truth as possible, and not obscure it.

. . . and now blazingly-fast pop-psychologist--MRT volunteers unrequested mental health referral services at no-extra-charge to TVAD. Most magnanimous indeed for a Renaissance man of so exalted a stature! Oddly enough, after the awesomely creative diagnosis of choleric distemper, he is not offering unflappable TVAD his own services for a more regular cycle of counselling sessions. Or is he perhaps not confident in his own therapeutic prowers?

That was hilarious Guidocorona.
Perhaps it's best to split this thread now into two distinct subjects:

1) the line cord frequency thingy
2) proposed new branch:
"How a technical discussion affects the mental status of Audiogon members" included we have a cast of mechanical froggies, psychologists, lawyers, philosophers, fisherman, and the impatient

If you are looking for good natured humor choose path 2.
If, however, you don't mind technical details and perhaps dry humor choose 1.

Eldartford,

Your river analogy is very good but what happens upstream of the audio component is all very criticial. As per Ridgestreet, there is a coloration on all the rest of the chain from the foundation up; the power supply gets modulated by all other circuitry.

I used to live in an area where my electricity came from a coal fired power station; the sound was smoggy and lacked clarity. Since moving to an area with gas fired electricity the improvements are astounding....crystal clear clean sound!

If any of you have heard exotic Power Cords that made a big difference just consider what enormous improvement can be attained from having your electricity generation come from clean gas or hydroelectric rather than dirty coal! One day I intend to hook up solar panels to power my gear for that last extra step to audio nirvanna!