That’s an interesting view, I take that to mean an uncompromising focus on audio quality - is that what you mean?I remember when I first got asked that question about 35 years ago. I had to think about it. I know it isn’t price! There are things that are expensive that are not high end and there are things that are cheap that are. So price isn’t it.
Sound quality is a better indicator, but it too isn’t the last word. One problem here is sound quality is highly subjective. Some people don’t care what it sounds like if it doesn’t measure well. So that doesn’t work either.
Appearance - ? Things can wind up being valuable due to their appearance but that doesn’t make them ’high end’! A good example of that is the Clairtone console stereo.
If the intention of the manufacturer is to be high end (as opposed to being expensive; these are two very different goals!) that ultimately is the final arbiter. This does not mean that the unit is great sounding but it does mean that it was **meant** to be great sounding.
So a chip amp can be built to a profitable product and/or it can be built with the intention to be high end. Its usually pretty easy to discern which is which.