how can a line cord affect frequency response ?

Yes! - to manufacturers continuing to have a say in this forum. They are also audiophiles with highly refined points of view. That knowledge is very useful.

i think it's ok for audio professionals to have their say as long as they do not attempt to sell on a discussion forum .

does anyone think its ok for a manufacturer to market his/her products on a discussion forum of this type ?

I believe we all should be allowed to use our own good judgement to determine when the mention of a product by a manufacturer is a blatant stab at guerilla marketing or when it is mentioned in the context of an explanation that contributes to the discussion. The two scenarios are not difficult to differentiate.

Holy cow!

Common sense abounding Tvad, what is Audiogon coming to?

i agree in principle, but if it quacks like a duck, looks like a duck.... it's a duck.

if someoneone wants to spin what is obviously selling into some other activity, we'll have to agree to disagree. like everything else in life, perceptions differ. you may see day when i see night.