Are manufacturer AC cables good enough?

Captain Irrelevant: so irrelevant, even when he cuts and pastes, still just as irrelevant as ever. Oh well. At least that was a readable departure from the usual word salad.

The question remains, is he capable of writing anything the least bit informative - in his own words?

Irrelevant and lacking sufficient reading comprehension that he does not even realize when he proves someone else's point:

"The distance is THOUGHT to depend on the black hole mass,"

Gallo said. "The larger the black hole, the larger the distance and the longer you expect for light to be emitted from the accretion disk to hit the broad-line region."

And as is well noted, things like the gravitation constant, which is ASSUMED to be constant, do not accurately model the universe we observe, hence things like dark matter, and fudge factors.  As pointed out previously, there are theories of gravity that do not maintain gravity as behaving consistently over distance.

By knowing this number, the speed of the broad-line region, the speed of light and what’s called the GRAVITATIONAL CONSTANT.

Go with what Nelson Pass says - the stock power cord that comes with our amps/preamps are all you need.  

Amp designers are almost always the last to know. 😳