Burn in and peer reviewed brain research

jastralfu

... the study did conclude that  perceived differences were potentially a result of psychoacoustic or psychological effects ...

The "study" didn’t examine any other potential cause, so it isn’t accurate to claim it reached a "conclusion."

A "study" you say? Well yes, it is a study:

• Indexed in PubMed Central (PMC), maintained by the National Institutes of Health
• Assigned a Digital Object Identifier (DOI: 10.7759/cureus.53097), PMCID, and PMID
• Published in a peer-reviewed journal (Cureus)
• Author lists institutional affiliation (Diagnostic Imaging, St. Marina University Hospital, Varna)
• Includes named editors (Alexander Muacevic, John R Adler) responsible for editorial oversight
• Structured with abstract, introduction, methodology, review sections on physiological, psychological, and societal dimensions
• Contains 78 citations to peer-reviewed academic sources across neuroscience, psychology, and audiology

Dismissing this as "not a real study" without addressing its substance accomplishes nothing. It’s a rhetorical move that avoids engagement. 

Do these things force agreement? Of course not. But the article provides a comprehensive, peer-reviewed synthesis of documented mechanisms (placebo effects, confirmation bias, neural plasticity, social conformity) that seek to explain burn-in reports. Waving it away is chest-beating which may be intellectually convenient but not honest. 

The burden is to engage the science, or provide other evidence. Ad hominem attacks against  the publication venue just reflect the arguer, not the target.

hilde45 

A "study" you say? Well yes, it is a study ...

It’s more of a compendium of previous studies than it is a study itself. It’s a narrative of existing literature that represents one side of the discussion only. The author doesn’t pretend to explore whether there are actual physical factors (mechanical changes) in a component that could cause burn-in. 

Waving it away is chest-beating which may be intellectually convenient but not honest. 

Accurately noting an article's limitations is actually part of the scientific process. It's interesting that you consider that "chest-beating" and dishonest.

@hilde45 

This is the age-old disconnect between faith and reason. Does burning a streamer's power cord for 200 hours contribute a meaningful improvement to the sound quality of the whole system? Did Methuselah really live 969 years? It depends not on what we (think we) know but on what we believe.

Thank you for bringing up this topic. This is a good thread. But at the end of the day, folks who hold moderate views on these matters may take notes and keep score but it's highly unlikely anyone else will be converted, nor even swayed one bit.

On the specific subject of speakers - they are mechanical assemblies whose characteristics and tolerances change with use, so it makes perfect sense that their end sound will evolve, and not just over some arbitrary 100- or 200-hr period but over their lifetime. Then again, speakers, and headphones, don't "burn" in, they break in. Ditto for tubes and gear that employ them; like speakers, it makes sense to withhold judgement until they have been properly broken in.

The case for other components is less clear-cut. You would want your SS amps and preamp to reach a point of thermal equilibrium before expecting optimal performance from them, of course, but that's not burn-in per se. Then, the further away one gets from major, complex components, the flimsier the case for burn-in making a sonic difference becomes, and the more the rationale of the argument shifts from reason to faith.