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The speakers in the 50's were very bad. They didn't have to be very good. It wasn't until about 1970 when Bose and AR and a few others began to make good quality speakers that real people could afford. The good (for their time) headphones were even worse and slower to arrive to the general public. The Koss Pro 4A was the first I remember.
In any case you don't ever want to talk about the beginning of "hi-fi" in the 50's and early 60's. I can only guess that what happened then, when "hi-fi" was coined and came into common use, does not fit your view.
The one significant point you missd in your examples though was that most of those great improvements since the 50's involved major changes in recording and distribution of music content, not speaker design. Fed high quality recordings those old 50's speakers still hold their own and in many cases are exceptional. The improvements in vinyl etc were largely a product of improved recording technologies and techniques, improved microphones, improved mastering, and storage/distribuion formats that contain much more data/signal.Most of the recordings from that era chopped half the audible spectrum worse than a low bit-rate MP3. The speaker designs of that era, especially the 60's were very much hi-fi even by today's standards. Again since the end result is real life sound, a known quantity, and since the modern headphones are simply reproducing current recording/distribution abilities, there's only a certain peak that can be reached before it's life-like,. And since colorless sound is only theoretical possibility, and in practicality not even desirable in a headphone, the question remains, how "non-life-like" is HD600, 650. How much more life-like is HD800, how much does 800 and even 650 veer away from reality and twoard "better than reality" in terms of detail accentuation. And beyond HD800, other than taming the highs, where does it go from there?
No, the only way we will see improvement to the point that the former hi-fi is no longer hi-fi is if it is in response to drastic changes in recording methods. Changes that go beyond just sample size and rate which can already be pushed beyond human hearing, and fundamentally affect soundstage/positioning/separation at the recording level. Until then we're at and have long been at the trailing edge of the reproduction of what can be recorded. HD598 did that long before HD650 existed, and I'm certain it wasn't the first to do so.
My latest sonic enhancement was througuh switching my 80's tubes to some 70's tubes. That old gear can sound darn good... As TM Raven said, tubes....ortho and stat tech predates HD600 by far. We're in a period of refinement, not revolution as far as playback and recording tech goes. Nothing close to what it would take to transition the very meaning of high fidelity. That can't happen until something fundamental changes in recording tech. And there seems to be no indicator that anything like that is even being experimented with.
The speakers in the 50's were very bad. They didn't have to be very good. It wasn't until about 1970 when Bose and AR and a few others began to make good quality speakers that real people could afford. The good (for their time) headphones were even worse and slower to arrive to the general public. The Koss Pro 4A was the first I remember.
In any case you don't ever want to talk about the beginning of "hi-fi" in the 50's and early 60's. I can only guess that what happened then, when "hi-fi" was coined and came into common use, does not fit your view.