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Audio technology already reached it's top ages ago.
There is a reason for the high demand for certain vintage audio gear. The only reason for new products is because consumers assume a product isn't good anymore when it's more then 5 years in production, so the manufacturers keep releasing "new" products that in reality offer nothing new and are just fooling the consumers to buy more gear.
I've traded vintage audio gear (listened to it as well lol) > Marantz 7c, 8b, Mac 225, 240, 275; Revox A77, Dyna ST70, others...
When tweaked and biased properly and all that good stuff, this equipment sounds quite remarkable.
But, for example, Abbey Road Studio no longer uses a Mac 75 in each corner in its main room,
as it did whilst recording Dark Side of the Moon
and many other great albums. They've moved on.
I disagree with the premise that "audio technology reached its top ages ago".
Especially when it comes to speakers. Huge horns buried deep inside massive
wood cabinets don't reproduce sound as well as planars and ribbons.
A lot of the
theory was there way back then, in the 50's, 60's, and 70's; but it's taken the huge leaps in materials technology
that have occurred since then to create the "higher fidelity" we have today.
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Still, though, I agree with you that manufacturers often roll out "new" products
that are pretty much the same old thing in new dress - with slight, incremental
improvements.
Occasionally, there is something actually
new - and when there is, we all tend to know about it.