I was a Martin Logan dealer for many years and have personally owned almost every speaker ML has ever made. I found a "slight" improvement with aftermarket power cords. It sure wasn't a significant upgrade, but was noticeable. I never tried anything over a $200 retail price. I even found that a regular heavier gauge power cord, (like from Digikey, 12 gauge or 10 gauge) better than the stock cords.
I am currently running Tributaries PC-9 power cords on my CLSIIA's because I got them at closeout for about 80% off. I recommend not spending a lot, but it can make a difference to a point.
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