High, medium or low-end can have many variables (i.e.: design & material usage, build quality, price, etc.), but has everything to do with the reproduction of recorded music. It’s that simple. The goal of all audiophiles and all “high-end” audio designers is to reproduce recorded music with the highest fidelity to the original performance as possible. Currently, it is not possible to duplicate true “live performance reproduction” so true high-end is more subjective than it is objective. Whatever it takes to achieve high fidelity is the ingredient(s) to “high-end.” There is no objective consensus as to which “recipe” offers the best approach to the end goal. Cost/price, by necessity, will almost certainly be associated with the pursuit of the high-end goal. However, as Albert stated, there are always exceptions, and fortunately, these exceptions are pretty much readily available (to achieve subjective methodology).