Are manufacturer AC cables good enough?

Here in AZ, it's quite necessary to have a large home AC (air conditioning) unit. When my AC unit comes on, there is a momentary dimming of lights and even a slight flicker in the TV picture. The one thing, in which I detect no flicker of the lights, no glitch whatsoever in the sound or performance, is my audio system. I do have my system running through a moderately priced 15A APC power regulator/surge protector - mostly for surge protection, but I suspect that mostly the reason for my system's stable performance is do to the well designed power supplies in my components. JMO, if your very expensive amplifier requires a $3K aftermarket power cord to make it perform well, I'd trade that thing in for something that had a decent power supply and performed as intended out of the box, with the cord that was supplied....Jim 

it's a term used when the subjective opinions have been acquired through controlled ABX testing and used in conjunction with scientific measurements in psychoacustics.

..then I think a proper english term is  - 'estimate'...not 'subjective measurement'

News Flash! Controlled ABX testing results have no meaning. Yes, I know what you’re thinking, but, but, but they’re supposed to be scientific and infallible.  😩

bikerbw:
" would you chance a lot of returns or bad reviews because you cheaped out on the cord." 

I think most notable reviewers use their own upgraded interconnects, speaker cables and power cables in their reviews.

There are all kinds of AC cables touted by manufacturers to do all kinds of wonderful things to your sound. The AC plug that all these cables are plugged in to, are fed with regular household contractor grade 14awg cables that go through walls and studs and are stapled to secure them. How would a 10awg cable improve the flow of electricity after it is fed with a 14awg cable run that has many twists and turns and could be 30-40' in some cases. Makes no sense. Can a larger gauge cable clean up any impurities in your house line or allow more electricity when it is only fed with 14 gauge.