I think much of this discussion assumes there is a specific "Mac sound". Since I've listened to only one Mac amp in my life I don't honestly know. But I'd guess if you lined up 10 different models of Mac amps you'd get 10 different sounding amps. Some may even sound more like a brand different from Mac. Can't prove it without doing it. But I wouldn't be the least surprised that's the case. And if that is indeed the case, chances are pretty good if there is one Mac amp you don't like there is another Mac amp that you will. There is a chance I could be wrong about this. But I've never been wrong about anything before...ahem.
Why do no audio enthusiasts use McIntosh?
With the exception of some of there tube gear, not many really use this stuff(or admit to it anyway), I am mainly referring to there amps. They look pleasant, they look good on paper and have the price of high end gear, but I seldom hear anyone claiming to like or one day dreaming of owning McIntosh. I have never really listened to there stuff, no good word of mouth sort of scares me away from it, the only people who like it are those who sell it, an uncanny coincidence? I don’t know. Sorry it this has been covered many times in the past, I ran a search and could not find anything.