@richardbrand ,
You’re likely NOT to hear a difference would be my guess. The Power Supply in those types of units are made with the cheapest parts that can be sourced. But, acknowledging your point, I never tried what you’re suggesting, so I can’t say for sure.
As I said a year ago, (when this thread was started), you’re going to need a higher-end unit with much higher end, heavier duty (usually separate for analog and digital) power supplies to hear a difference with a power cord change. I’ve tried power cord swaps on $699 MSRP players and didn’t really hear much of a change at all. I’ve also tried swaps on $3k+ players, and the change was immediate, and very noticeable.
I still stand by that. The change is real, but you have to start with something quality, not a $39 WalMart DVD player. Give it a shot, though if you’re feeling froggy. You can always re-hook the Wall Wart power wires back up with wire-nuts, lol.