depends on how long it takes for your ears to acclimate to the sounds of different components or different cables...your ears will ajust to the new sounds over time...
Whenever I have gotten a new power cord I just put it on a piece of equipment that will pass current through it for 240 hours or so and then install it in my system and listen. The sound of my system with the power cable in place is what it is.
I know I have no baseline to compare what the cord sounded like before and after burn-in but my reasoning for doing this is that pretty much every burn in thread I've come across has stated aftermarket cables change/improve the SQ of your component after 200 hours or so of break in. To me why go through the trouble of the swapping back and forth and wondering. Just run the cable in and listen.
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