Amp improvement since 1994?


How much real improvement in top level amps. Where have the gains been?
ptss
It depends on what you mean by "real" improvement. Probably nothing that can be measured.
I do agree that the trend seems to be towards transparency/resolution and away from musicality, but I'm not sure that is a good thing. My old tube amp beats most of the modern amps out there now, IMHO.

As to your last question, where the gains have been, I would suggest mostly in the price tag.
Interesting Timrhu. Audiolabrinth, I realized dramatic transparency improvements from power supply improvements. Experimenting with balanced isolation transformers, various conditioning devices and MIT networked power cables has improved my preamp (reputed to have a 'very' high quality separate power supply)incredibly. I believe the power supply was definitely the weakest link in my system.
Look at power supplies in the newest Rowland amps - they are line and load regulated high frequency (1MHz) switchers that are extremely quiet. For that reason he uses switchers in preamps (where efficiency plays no role) - instead of linear power supplies, that in reality are noisy unregulated primitive switchers (but easy to design).
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Plenty of improvements
Take Pass Labs for example. The new supersymmetry is amazing!
Real designers are constantly pushing the edge of what is possible.
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Yes, plenty.

Smaller, lighter, more efficient, more power, lower noise levels, more compliante, you name it, improvements pretty much in every way. Technology moves ahead significantly in all ways in 20 years.