how can a line cord affect frequency response ?

You'll need an electronvelocitormeter...it will also enable you to adjust the proper level of headlight fluid in your car.
Audiofeil  (Answers)

Oh great, another chore for the weekend! I forgot to check my headlight fluid the last time I put water in my tires.

**I forgot to check my headlight fluid the last time I put water in my tires.**

You're poking fun at a very serious situation here. Recently an AC worm infiltrated my power conditioner rendering it useless. Before I became aware of that rascal, it had also infected my power cords totally disabling them. The copper and gold conductors had turned to lead. I'd advise all readers to install a firewall on your power conditioner and dutifully monitor your electron speed. Forewarned is forearmed folks.

Recently an AC worm infiltrated my power conditioner rendering it useless.
Audiofeil  (Answers)

All kidding aside, do you know if Ortho "Bug-Geta" Snail Bait will work on the AC worm? If not, we also have some worm pills we keep handy for our cat.

**do you know if Ortho "Bug-Geta" Snail Bait will work on the AC worm?**

This is undoubtedly the most meaningful thought you've posted. The answer is, I'm not sure. The first thing I did was spray the entire power delivery components with Round Up. Then I installed a wind powered generator and converted everything to DC. My electrons were not up to the challenge of changing direction 60 times every second so I made it easier for them; nothing to think about just look straight ahead. Now they all move in the same direction, at the same time, in lock step.
Lastly I made the switch to dedicated DC lines and DC power cords.

Now they all move in the same direction, at the same time, in lock step.
Audiofeil  (Answers)

No doubt accompanied by the "Schoen ist es, Soldat zu sein" march.