Ok, I will be the odd man out. Power cords WILL make a difference on your crossover and class D amps in your [expensive] speakers.
https://www.martinlogan.com/renaissance-esl-15a/index.php.
I would not go TOO crazy, but you really should demo a variety of cords less than $250/ea. Maybe start with Pangea (Audio Advisor), Cullen Cable, Signal Cable, VH Audio, TG Audio, etc.
Then decide for yourself if the improvement is worth the additional cost.