Speaker Break In...? Or listener “Break In”?

So annoying to hear categorical claims such as 'all do' or 'all don't.'  Does it not occur to the people making such claims that 'some may' and  'some may not?'  Like many claims of physical characteristics in audio, these should be amenable to physical measurements. I spent 5 years as the "human factors" postdoc in a department of electrical engineering and saw this being done all the time. Are there no real engineers in audio?

Notice I don't say measurements that people can detect any difference.  That type of measurement is much more difficult to carry out given the inherently noisy nature of human testing. 

I agree with everything prof1 said. These things have been physically measured. The changes that occur are quick and inaudible. It's listener break-in.

Gosh, do you think maybe the changes are inaudible because the people listening are hearing challenged? Or because they’re so busy making changes any changes that do occur are hidden in the noise? Hel-loo! Physically measured? By who? Nobody ever measures break in. You don’t even know what to measure. Give me a break!

Regarding Thiele-Small Parameters, which ARE measurements, and DO change with break-in: http://audiojudgement.com/measuring-thiele-small-parameters-part1/ As I stated earlier, "That’s just simple mechanics." "There are also mechanical changes which occur in the moving components during use. In this case, however, most of the changes seem to occur early in the life of the driver, and are almost certainly due to relaxation in flexing mechanical parts of the driver (e.g., surround, spider, etc.). SEVERAL STUDIES HAVE BEEN PUBLISHED documenting substantial changes in the T/S parameters over the first few hours of use, some parameters changing as much as 15%+ over these initial periods.", is how this article describes it, under, ’Lifetime Changes, in Driver Behavior’(toward the bottom of the page): http://usenclosure.com/TS%20and%20Company/Thiele_Small%20Life%20and%20Times.html

That’s actually a very unconvincing argument. To whit,

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Notice from the graph below, that the 2 curves are ever so slightly offset. You could argue there is a difference, but it’s negligible, most certainly unnoticeable in the real world. However, if you measure the TS parameters before and after break-in, and you get different Fs / Qts numbers, you probably got a faulty driver. This is another reason why you should break-in a speaker. Starting out your project with a damaged speaker is a recipe for failure. Even if you don’t measure the parameters before break-in, making the speaker play at  high excursions for 12 hours will almost certainly reveal flaws in the suspension, or voice coil defects.”