how can a line cord affect frequency response ?

Some time when I have a few grand to get rid of I will try out some different power cords. Til then I will stick to my belief that a properly designed power supply will produce DC without artifacts of the input AC power. There are many instances where physical characteristics are completely lost in a transitional state.
A simple analogy might be a river going over a waterfall. The smoothly flowing water below the falls shows no evidence of ripples above the falls. The river has been reconstituted from millions of droplets falling through the air, and has "lost its memory" of what happened above the falls.

let me clairify my statements robert, which are not personal.

i think that a forum should not be a venue for advertising or attempting to sell equipment.

there is another section for buying/selling equipment.
i believe that you advertise your products from time to time.

if you have heard products, in this case power cords, which to your ears affect the sound in a certain way why not mention them, especially if someone requests such information.

i'm not judging you, just observing the obvious conotations from your words

Hi Mrt.

if you have heard products, in this case power cords, which to your ears affect the sound in a certain way why not mention them, especially if someone requests such information.

You'll never see RSAD do that on the boards. I would suggest if you want opinions on how a particular product sounds, ask other users who enjoy those offerings or the manufacturer. Not ask one manufacturer to comment on a competitor's efforts on a public forum.

Kind Regards,
Robert
RSAD

Mrtennis, I had the pleasure of meeting Robert and Steve of RSAD spending a afternoon talking and listening to their system a few weeks ago. It was probley the best learning experience I have had since getting into audio, Robert and Steve have a true passion for music. The system I listened to was the most natural and neutral I have ever heard. I hope to add their cables to my system in the future so I can truely hear what my components can do. I would suggest you call Robert i'm sure he would be more than happy to explain his opinions and help you understand what cables can do for your system.

While this may not answer your question, if you are looking for some type of guide as to the sonic signature of various brands of PCs, this thread by Audiogon member Tvad may be of interest to you:

http://forum.audiogon.com/cgi-bin/fr.pl?fcabl&1126482002