Power cords do make a difference, and I'm sure everyone will agree. However, the why and how is up in the air. I believe that the perfomance changes (changes, not necessarily improvements) are due to EMI/RFI shielding. You can have the most sophisticated power filter and yet it goes to naught if the PC's from the filter to the equipment pick up, or contaminate things with, electric fields. This is what ultimately reduces the noise floor making your equipment perform better.
And, as far as so-called power delivery, I do not see nor can I physically explain why ads claiming current delivery is dramatically improved by providing silver, cryo'd copper, fatter wires, etc. Personally, I think it's a waste of material - your power draw is limited by (working backwards) the outlet, the branch wiring, the breaker element, the panel bus, the panel lugs, the service wire (which feeds other circuits), and the meter pan (a piece of flimsy tin-coated copper). The only thing this PC will further reduce is the miniscule voltage drop over the last 6-feet; the power supplies can easily absorb it. For that $1,000 I'd replace the outlet, replace the branch wire with a heavier one and spend what's left on a well shielded PC. The trick is to reduce the losses as far back in the chain as practical, as you'll never get them back no matter how exotic the PC.
So, when trying out power cords, listen and see what they do for you. Yes, they'll certainly make a difference - but you can get just as good results over a wide range of products that are considerably cheaper than others. Let the ears decide - not the price tag.
And, as far as so-called power delivery, I do not see nor can I physically explain why ads claiming current delivery is dramatically improved by providing silver, cryo'd copper, fatter wires, etc. Personally, I think it's a waste of material - your power draw is limited by (working backwards) the outlet, the branch wiring, the breaker element, the panel bus, the panel lugs, the service wire (which feeds other circuits), and the meter pan (a piece of flimsy tin-coated copper). The only thing this PC will further reduce is the miniscule voltage drop over the last 6-feet; the power supplies can easily absorb it. For that $1,000 I'd replace the outlet, replace the branch wire with a heavier one and spend what's left on a well shielded PC. The trick is to reduce the losses as far back in the chain as practical, as you'll never get them back no matter how exotic the PC.
So, when trying out power cords, listen and see what they do for you. Yes, they'll certainly make a difference - but you can get just as good results over a wide range of products that are considerably cheaper than others. Let the ears decide - not the price tag.