Klipsch was alive and quite sane, from all accounts, until quite
recently. He to my knowledge declined to substantially modify any of
his legacy products for at least the last twenty years of his life if
not longer.

As you know I completed a review of a Klipschhorn modification
recently during which I concluded a modificatiion was highly desirable.
So I am not promoting the vintage K-horn as a gold standard of
speakers, indeed I believe a new clean sheet of paper design could have
substantial advantages. Klipsch won't do it for many reasons, some
obvious and others less so.

Despite this, the Klipsch speakers work as well as they ever did today
and indeed easily can do better, and that's a very satisfactory level
indeed. This is also the case with many "Golden Age" designs of
electronics, although improvements are possible today in many respects
they still reproduce music very well and in some ways far better than
much (at the very least, I would say most) of the modern equipment
currently vended.