But, as other comments have said, there have been at this point a good slew of blind tests, and Strads are hardly ever recognized better than chance when compared to modern instruments, even when played by experts and judged by experts. People have been studying and modeling after Strads for so long it would be pretty shocking if we couldn't make instruments that sounded as good. In my mind that doesn't make Strads any less valuable - an original Picasso is still valued so highly because it was created by the master that invented Cubism, but that doesn't mean that a modern painter couldn't create a Cubist painting that was "just as good", objectively.
Others are also commenting about audiophiles. But there's a big difference: an audiophile's sentiment about their gold wires doesn't change the sound coming out of the speakers for the rest of the listening audience. On the other hand, a violinist's sentiment typically does.
Also, just to be clear-- are you saying there are blind tests where an expert tried playing multiple violins and couldn't guess better than chance which one was the Strad?
Edit: clarification
Yes, this has been done many times.
The engineering seems to be a combination of genuine construction advances and the usage of wood that was abnormally dense due to having been grown during a big drought.
This, of course, contributed to the "myths" around the Strads with the varnishes, techniques, etc. supposedly being "The Thing(tm)" that made Strads so much better.
Finally, wood degrades with time--period. It doesn't matter how much you try to preserve it, it's just fact. The current Strads are either "Ship of Theseus" type violins, or they are heavily degraded.
At this point, modern luthiers create better instruments than even a Strad in its prime. They have access to better woods, better glues and finishes, better tools and training, better analyzers and better players than anyone in the time of Stradivarius.
When played as close to double blind as is possible, the data comes back with modern players preferring modern violins made by modern luthiers over the old Strads.
I don't have Studies to back this up, but anecdotally:
* Playing fine violins takes a lot of practice with the specific instrument to begin to unlock its potential. I was scratching the surface after a couple months; people with longer-term loans say it takes years.
* Strads in particular are surprisingly hard to make sound good at first. I'd say there was a good two weeks where I sounded better on my $2500 Chinese-made violin than I did on the multi-million dollar Strad. (del Gesus sound great out of the box. This is widely agreed upon but I don't know why it is)
* In terms of pure craftsmanship there are many contemporary makers who are working as well as Strad and del Gesu, and I don't place much stock in them having access to uniquely good wood or magic varnish or anything like that.
* However, for poorly-understood reasons the act of playing a violin "opens up" the sound and also gives you access to more and more tone colors. A 300-year-old violin that's been played a lot will therefore have a much bigger tonal palette than a contemporary violin, even if any individual tone color isn't strictly better than the tone of a contemporary violin.
* The corollary is that in the year 2300 I believe top-end contemporary instruments will be as good as Strads are now.
* If you just thought "what if we simulate the vibrations of playing on new instruments to expedite their aging", you're not the first! Some luthiers hook new instruments up to a specialized amplifier and effectively play music through the violin for a couple weeks before selling it. A lot of people claim this helps a lot, but I don't have first-hand experience of it.
Wouldn't you like to know if you could sound just as good on an ordinary instrument? I imagine a lot of money could be saved and and a lot of stress could be avoided.
Anyway everyone who uses one of these still has their "normal" (masterfully crafted modern) instruments for when it's the more practical choice.
One large difference today is instrument makers are starting to share their techniques with each other, whereas Stradivarius took that information to the grave.
With Strad you're getting a high end instrument but also paying through the nose for rarity and legend.
It is very difficult to obtain access to the instruments. The general sentiment from musicians and collectors seems to be that they don't want a bunch of scientists to come into their world and tell them that what they are or are not hearing or they just don't understand why controlled tests are required.
There seems to be the same sentiment from audiophiles against testing their ridiculously overpriced placebos, although sometimes it does happen and the results are exactly as you'd expect: https://news.ycombinator.com/item?id=47015987
I certainly appreciate all the emotions and culture that go into making beautiful music on a cello. But it's important to separate that placebo affect ("I think it sounds better because I know it's a Strad"), from the real physical differences, because people have gone to great lengths to find "the secret of Strad": was it his varnish, the Maunder Minimum, an extended drought, special wood treatment to prevent woodworm, etc. etc. Except time and time again we find there is no "Strad secret", beyond his expert craftsmanship, attention to detail, and fundamental changes he made to the shape of the plates of his instruments compared to his predecessors.
Isn't this trivially true? I'm sure if you hook up both cellos to a bowing robot using many permutations of contact point, fingering, speed, pressure and angle, and record the sound, it would be possible to consistently discern them through spectral analysis or something. Is the claim that if an expert modern luthier reproduces a stradivarius he can get it so close as to measure identically?
edit: by the way
>I agree with everything you've said. It's also completely irrelevant to the question at hand, which is whether there are any real, noticeable physical differences between the sound produced by a Strad and that produced by expert modern luthiers.
I don't know why you would say my post is irrelevant to that question. You said "people should be able to hear the difference in that sound in blind tests", and I'm saying that the difference between two cellos could be more complicated than just listening to one after the other for some minutes and filling in a questionnaire.