High End, at one time, meant the components that came closest to mimicking the sound of live, UNAMPLIFIED, acoustic music heard in a defined space.
The problem is, too many people on forums do not go to live, unamplified music events, so there’s no way for them to know what is closest to the "musical truth." So they proclaim certain equipment "crap" without knowing for certain, that the setup and electrical compatibilities are not to blame.
I heard the ASL Hurricanes at Lyric HiFi in 2003. If I used that ONE audition to conclude the quality of those amps, I would have pronounced them unfit to be called 'High End.' However, I didn’t trust the audition, because the dynamic range was so bad, that after reading the TAS review, I had no doubt that that would have been a mistake to think that this is what the amps actually sounded like. And this, in a room with the IRS V speakers sitting nearby (but not hooked up for the audition). I looked over every piece of equipment in the system, and - except for the Dynaudio speakers - knew that the sound I was hearing just couldn’t POSSIBLY be the way it should sound.
So, I bought the amp, months later, elsewhere (and still unheard, except for the Lyric HiFi audition), set it up in my own system and listening room and turned it on - and was immediately dazzled by the utter realism of it. And by "immediately," I mean I pressed "play' on the remote control cd player over my shoulder, walking back to the listening position. Didn’t even make it to my listening chair (all of 10' away) before I whipped around, astounded, by the sonics. I was expecting, based on HP’s review, a certain "magic" to the presentation, but I got far more than I ever expected. To this day, I still have the amps. And I’ve heard higher resolution components but never anything with more "realism" than the ASLs. (I’d sure like to, but nothing I’ve heard over the years is akin to the realism they produce, although I can outlines their weaknesses easily). So, back to the point: mismatched components - and I have heard dozens of setups that I’d call 'mismatched, if only because the resulting sonic presentation was REALLY mediocre - are all too often responsible for what people hear, rather than the component itself, at its best.
And that is also why I only comment on what I have heard, not on the whimsical - or snarky - utterings of others who’ve never heard the component they shower such disdain upon. This is why so many others get it so wrong - and so often.
Even some inexpensive components come close to the "musical truth," if that includes tonal accuracy, musicality and dynamic range and contrast. They may not be the last word in sound staging, imaging, high frequency extension, etc, but they’re still truthful to music that was recorded in specific halls. In other words, Carnegie Hall, the hall I know best, sounds like Carnegie on recordings I know well (mostly older recordings, and BY FAR, on vinyl). But if you know live music, you know its rarely "boxy"-sounding, or the surrounding acoustics sound like it was recorded in a hall with a 20 watt bulb, and the dynamic range is...non-existent on the 1812 Overture.
Nowadays, people have hijacked the term "High End," to mean "expensive (which equipment certainly is, these days)! I don't place much faith in their opinions if they only refer to other components, never mention ANY comparison to live music, or, AT LEAST recordings that have minimal manipulation.