Martin Logan would spend the extra money for a better power cord, but you'll not get it for free.
You'll have to pay for the extra performance.
Think about this.
The speakers sound fine with stock power cords.
They do sound better with better power cords,which don't have to be expensive, and can be bought used or go DIY with better connectors.
Is our goal as music loving audiophiles the cheapest way out?
Is good enough really all we should be happy with?
Do we have to settle for mediocrity, when excellance is just a few steps away?
Is limiting a speakers potential to save a few bucks really getting the full value out of the money we spent on the speakers?
Think about it.
I had two pair of CLS stats, the sequel and Quads, and better power cords improved the sound of all of them.
In fact, when I had my 63's back in 1987 I made my first ,cheap, power cords for them.The fellow buying my Quads wanted to pay me extra for the DIY power cords because of the improvemnt they were compared to the stock Quad cords.
Anyone who has seen the hair thin power cords Quad supplied for the 63 can attest to the fact that Quad, as do most other companies, supply the cheapest cords that they can.
Do they work?
Yes.
Just not as well as other power cords will.
And while you're at it,upgrade the fuses.