Are manufacturer AC cables good enough?

what matters is if you prefer them in your room, in your system. and feel they are worth the cost to you...don't care if others like them in different rooms and with different systems...and the differences are not necessarily night and day...and if you don't like them or don't feel they are worth the price, then you return them for a full refund...seems so simple 

^^^^^
And this would be the typical answer to the question. Excuses and deflections. Is the questions overly hard?  Why don't suppliers do public blind tests to remove all doubt about audibility? It is not a question of they rarely do it ... it is literally they never do it.


Can anyone answer this question without an excuse?

I do not know any suppliers so I cannot answer, only can say what I do and why...some of us care about others doing blind testing and having lots of data, and some of us don't...and that's fine and good

In all fairness, I am not sure if any audio manufacturer does blind tests in public. At the same time, speakers, amplifiers, etc., are, more or less, readily available in shops for one to compare them. With a little effort, a person could arrange it to be somewhat blind. Not exactly strong scientific blind, but usable on a casual personal basis. Kind of for choosing speakers to buy.

Is it possible to do something like that for cables, without going through the hassle of buying, packing, sending back? Do audio stores even cary any range of cables?

For example, Synergistic Research dealer is not that easy to locate.
You do have to submit some of your personal information first.

https://www.synergisticresearch.com/dealers/

I did blind tests at CES in 2005 in the Golden Sound room for the Intelligent Chip and Brilliant Pebbles and I think we did blind tests for Ultra Tweeters too. The ones with no output below 1 GHz. The well known U.K. reviewer whose name escapes me did a blind test of the Intelligent Chip for an auditorium full of people in U.K. that year. I also did blind test of Mr. Chip for John Curl and Bob Crump that same year. I actually recommend A/B tests for some of my products, like Clever Lil Clock, Positive Feedback did a blind test for the clock way back when. No big deal. 

A lot of audio devices require a certain amount of testing just to find out where the heck the damn things should go in the room, you know, things like Tube Traps, room diffusers, tiny little bowl resonators, Mpingo discs, things of that nature.