Are manufacturer AC cables good enough?

I keep telling you guys the manufacturers are always the last to know. That’s just the way it goes sometimes. 

I think the accountants pick the power cord not the engineers 

If the accountant picked the mains cable then the company would go with a very exotic audiophile cable they could produce for $10 use the pseudoscience gobbledygook talk of other high end cable " manufacturers " and give the wide eyed audiophile a bargain for a measly extra $500 with the purchase of a $10,000 amp. Of course it would be voiced especially for them 😉

Ayre for many years had a line of Ayre branded premium cables manufactured by Cardas if my memory is correct.

Yes, the "Ayre" cables were sourced from Cardas. I think the speaker cables were essentially Golden Reference but in a different jacket. Looks like Ayre no longer offers these (judging by their website).

My thinking is that Ayre wouldn’t supply cables that are inadequate for their components.

Ayre would probably say that their OEM cable is "adequate" but add that you can get even better results with some aftermarket cables. I know they often show with Cardas, sometimes Audioquest (maybe others?). From their perspective, it isn’t sensible to include a $$$ power cord or IC with their components. For one thing, as was pointed out up-thread, they have no idea how long your cables need to be. Secondly, tastes and opinions of cables widely range. Some don’t think cables make any difference whatsoever while others insists on specific brands or technology. It would be tough to satisfy more than a minority of customers, and that's assuming the cable is even the proper length.

Obviously there are lots of opinions about power cords, as well as about nearly every aspect of audio.  I found a few of the comments inane or illogical.  One thing I didn't mention that turned me off the AC3 and to a lesser extent the AC14 is the size and stiffness of the cable, a convenience not audio factor.  

IIRC, I bought the AC3 cables for the JC-1s.  I went from Parasound (JC 2 & JC 1) to Ayre (KX-5/20 & VX-5/20) when I added a DX-5 DSD disc player and QX-5/20 digital hub for Roon.

db