Case Study 8.1: The Stradivarius vs. Modern Violins...

The Myth and the Stakes

The Stradivarius violin is the most famous acoustic instrument in the world. Of the approximately 650 Stradivari instruments that survive, several hundred are still played as concert instruments. They sell at auction for between $1 million and $20 million. Professional violinists speak of them with reverence that borders on mysticism. The "Stradivarius sound" — warm, complex, projecting, with a characteristic "singing" quality — is widely regarded as the benchmark against which all other violins are measured.

This reputation rests on a central empirical claim: that Stradivarius instruments are acoustically superior to the best modern violins. If this claim is true, it has profound implications for instrument physics — it means that either Antonio Stradivari (1644–1737) discovered acoustic principles that modern instrument makers have not fully recovered, or that the materials of his era (the Cremonese wood, the varnish formulas, the wood treatment methods) produce acoustic properties that cannot be replicated today.

If the claim is false — if the Stradivarius reputation rests on historical prestige, social expectation, and confirmation bias rather than measurable acoustic superiority — then it has equally profound implications: it means that our perceptions of acoustic quality are powerfully shaped by belief, expectation, and cultural context in ways that can override the physical facts of the instruments.

The 2012 Study

In 2012, the acoustics researchers Claudia Fritz, Joseph Curtin, Jacques Poitevineau, Palmer Morrel-Samuels, and Fan-Chia Tao published a landmark study in the Proceedings of the National Academy of Sciences (PNAS): "Player Preferences Among New and Old Violins." The study was designed to test whether professional violinists could distinguish Stradivarius instruments from modern instruments in a properly controlled blind test, and which they preferred.

Methodology

The researchers recruited 21 professional violinists who were participants in an international violin competition in Indianapolis. Each violinist was given time to play and evaluate three old Italian violins (two Stradivari and one Guarneri del Gesù, another highly prized maker) and three new high-quality violins (made by contemporary makers) under the following conditions:

Violinists wore modified welding goggles that allowed them to see the instrument they were playing but prevented them from seeing any identifying marks that would reveal whether it was old or new
The room was dimly lit to further reduce visual identification cues
The violins were treated with a scent that masked any smell from old varnish
The instruments were presented in random order
Violinists did not know what specific instruments were in the set

The violinists were asked to: 1. Rate each instrument on several acoustic dimensions (playability, projection, response, tone quality) 2. Rank the instruments in order of preference 3. Identify which instruments they believed to be "old" and which "new"

Results

The results were striking and controversial.

Preference: The violinists showed a slight statistical preference for the new instruments over the old ones. When asked to rank their top choice, new violins were chosen most often (ten of the 21 violinists chose a new violin as their top pick). The old violins were not significantly preferred.

Guessing old from new: Violinists were no better than chance at correctly identifying which instruments were old and which were new. The overall accuracy of their guesses was approximately 50% — random.

The Stradivari specifically: Even when including only the Stradivari in the analysis, violinists were unable to reliably identify them as old instruments or consistently prefer them over new violins.

The Controversy

The 2012 study was widely reported in the media, often with the headline "Stradivarius violins are not superior to modern violins." The actual scientific community response was more nuanced.

Criticisms of the methodology: - The sample size (21 violinists, 6 instruments) was relatively small - The instruments were not the most famous Stradivari (the "Messiah," the "Betts," or other top-tier instruments were not included) - The testing environment (a hotel room) was not a concert hall, and projection over a large acoustic space may be where the Stradivarius advantage, if any, most manifests - The welding goggles may have changed the violinists' playing technique in ways that reduced their ability to evaluate the instruments fairly - Three plays per instrument (each lasting a few minutes) may be insufficient to judge an instrument's full acoustic range

Responses to the criticisms: The researchers followed up in 2014 with a more extensive study that addressed some of these concerns. They tested in a larger hall, allowed the violinists more time with each instrument, and added orchestral accompaniment. The results were consistent with the 2012 findings: professional violinists showed no significant preference for old Italian violins over new ones in blind conditions, and some violinists explicitly preferred modern instruments for their playability and projection.

What the Physics Tells Us

The acoustic science of why Stradivarius instruments might be special — or might not be — has been investigated by several research groups. Key findings include:

Wood density and age: The density of old spruce wood (the material for the violin top) affects the speed of sound through the wood and therefore the resonance frequencies of the top plate. Some studies have found that Stradivari used wood with unusually low density for its period, possibly related to the "Little Ice Age" of the 17th century, when colder temperatures produced spruce wood with denser, more regular growth rings that aged into a specific acoustic quality.

Wood treatment: Chemical analysis of Stradivari instruments has found trace amounts of specific minerals (aluminum, calcium, potassium silicates) in the wood that some researchers suggest were applied as wood treatments to modify the wood's acoustic properties. Whether this treatment (if deliberately applied) improved the acoustic performance remains debated.

Varnish: The Cremonese varnish formulas of Stradivari's era have been extensively studied. Some researchers argue that specific varnish properties (hardness, porosity, elastic modulus) affect the plate vibrations and therefore the sound. Others argue that varnish effects on tone are minimal compared to the effects of plate graduation and arching.

Setup and adjustment: The setup of a violin — the height and shape of the bridge, the position of the soundpost, the string type — can dramatically alter its sound. A Stradivarius in suboptimal setup may sound inferior to a modern violin in optimal setup. Most living Stradivari instruments have been modified significantly from their original state: necks have been lengthened, bass bars replaced, bridges changed, and strings updated. The "Stradivarius sound" we hear today may partially be the sound of these modern modifications.

What the Study Really Shows

The PNAS studies are best understood not as proving that Stradivarius violins are "not better" but as demonstrating that the Stradivarius reputation does not manifest as a consistently detectable acoustic advantage in blind testing conditions. This is an important distinction. It may be that:

Stradivarius instruments have genuine acoustic advantages that only manifest in specific performance situations (large concert halls, specific repertoire)
The differences between the best old and new instruments are real but smaller than the variation between different examples of each category
The reputation effect (the psychological impact of believing you are playing a Stradivarius) is itself a musical reality — it affects how performers play and how listeners hear
The "Stradivarius advantage" exists at the level of specific interactions between specific instruments and specific players, not as a general class-level effect

Point 3 is perhaps the most interesting: the fact that violinists play differently when they believe they are playing a Stradivarius may be a real and legitimate musical phenomenon, even if the acoustic superiority of the instrument cannot be measured in blind conditions. The belief in the instrument's quality may actualize that quality in the performer's behavior.

Discussion Questions

The 2012 study found that professional violinists could not reliably distinguish old Italian violins from new ones in blind conditions. Does this mean the Stradivarius reputation is purely mythological? What else might explain the persistent belief in their superiority?
The researchers took care to control for visual and olfactory cues but acknowledged that the testing environment (a hotel room) might not represent the performance conditions where Stradivarius advantages might manifest. Design a follow-up experiment that would specifically test whether Stradivarius instruments project better in large concert halls. What acoustic measurements would you take?
Some of the most famous violinists in history — Heifetz, Oistrakh, Menuhin — played Stradivarius instruments and described their acoustic properties in specific terms. Should we weight their testimony more heavily than blind test results? What are the strengths and weaknesses of each type of evidence?
The chapter discusses how instrument bodies are custom filters that shape the harmonic series of the strings they amplify. In terms of instrument physics, what specific acoustic properties would you predict might differ between a 300-year-old Stradivarius (made from wood that has had three centuries to dry and season) and a modern violin of equivalent craftsmanship?
What does the Stradivarius case study tell us about the relationship between physics, perception, culture, and economic value in the world of musical instruments? If the physical acoustic advantage cannot be reliably measured, why do Stradivarius instruments cost 100 times more than excellent modern instruments?

Case Study 8.1: The Stradivarius vs. Modern Violins — What Double-Blind Tests Reveal