I've been using Silent Source Signature cables with good success in the MA-2s.
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Sonic_genius, if you owned Atma-Sphere amplifiers you would know they are not finicky. In fact they are ultra reliable, unlike some other OTLs which are/were not -- an unfortunate stigma. If this were not true Atma-Sphere would have gone out of business long ago, but instead they've been around since 1976 and are still going strong. And they carry a three year warranty. A company that's uncertain of reliability doesn't offer that.
Back to the original topic, yes, some power cords sound better than others on them, but I can't post recommendations here.
I'm a dealer, so sprinkle liberally with salt if you wish, but please check out the products before making assertions.
The A-S amps will sound slightly different with different power cords, as will all electronics I've ever used. The generic cords A-S supplies with the amps sound okay. Other cords sound better. But the amps are NOT finicky and do NOT "require a well matched cord" as stated by Sonic_genius.
As Essentialaudio says, some cords offer better sound than others. And this is true with any piece of gear offering the neutrality and resolving capabilities similar to A-S.
Sonic_genius, if you owned Fourier amps you know very well what 'finicky' is. I owned one of their stereo amps for a short time. It was constantly blowing up: decent parts quality but atrocious layout, workmanship, and mechanical design, not to mention components such as output coupling caps used beyond their specified operating range...in other words, a ticking time bomb destined to fail. You should have seen the overwhelming number of amps lined up along and below the benches at Fourier for repair! Tom was a nice enough guy but didn't know how to run a business, and Bryan Carey who took over near the end was far worse IMO.
I gave it away in disgust and moved on to Atma-Sphere. Completely different animals. Sound great, ultra reliable and stable. So as your comment implied, you have not owned Atma-Sphere.
Thank you very much for the Canorus and Stage 3 suggestions, (I'd really love to hear the stage 3's). I'm wondering if there is anything in the $500 to $700'ish range worth trying that might be at least in the same vein as those more rarefied suggestions. I was looking at a Triode Wire Labs 7 Plus perhaps or maybe a Shunyata of some description but would be open to other ideas.
I've used most of the upper-end Shunyata cords with the Atma-Sphere M60s, MA1s, and MP1, all with excellent results.
However I'll agree with the other long-term Atma users on this thread - the amps just are not that finicky wrt power cords and don't think you need top-of-the-line to reap their benefits. If looking today I'd consider the 9AWG Shunyata Venom HC which is somewhere around $300.
The best thing you can do for these amps is dedicated circuits and keep any DC out of the line.