Are manufacturer AC cables good enough?

Not all audio differences or effects are huge or even easily discerned. Sometimes they are aren’t observed, especially on first hearing. Furthermore, any differences or effects that should be audible can easily be covered over and masked by all manner of mistakes in the system or perhaps external factors, time of day, the weather, whatever. Yes, I know what you’re thinking. “But I never make mistakes in my system. My system sounds fabulous!” 🤗

heaudio123

Why am I here cleeds? Partially Covid boredom, still working lots, but not in nearly as many meetings, and the work day never really ends ...

I didn't ask why you're here, but I respect the candor in your explanation.

... that is exactly what real scientists do. They quickly dismiss data that is not collected in a repeatable at least somewhat rigourous manner, they dismiss experiments that make no attempt to control for variable, etc.

Don't be silly. Real scientists actually conduct their own tests. They don't dismiss every listener's casual account with a wave of the hand while muttering about the lack scientific control yet making no effort to conduct their own inquiry, to their own standards. (To be fair, that may not fully apply to you, because I saw another post you made where you suggested acquiring some speakers to test.)

... maybe I am just here as a marketing exercise cleeds, you never know do you.

Oh no, you do sometimes know, and it's part of separating the wheat from the chaff on Audiogon. There are many people here who post under their real identities. And there are many others who are otherwise known, such as everyone buys and sells on this site. Not everyone is hunched anonymously over their keyboard.

Why are you here?

It's a hobby. I've been into music and electronics for as long as I can remember, and got into high end audio in the late '70s. I've been active on various sites going all the way back to Usenet and r.a.h-e., always under the same moniker. As Casey said, "You could look it up."

You should also ask this one why he changed his username from Atdavid and now posting under a different name. It's the same guy. Look at the timelines. Brand new member since February, zero purchase history, and identical "speech" to Atdavid. Same guy posting in Audiogon under questionable motives / agenda.

I take sound quality extremely seriously, but I'm not inclined toward drawing my sword whenever I come across an opinion I don't agree with.  I actually enjoy all the backbiting endemic to this site.  It's okay.  Blast away.  As long as you guys don't start dropping multi-ton mono amps on each other's toes.

Ahh, posts from atdavid.
Good times there.....