The secret of the ritual “warming up” or why “warm” headphones sound “better”

 3r3144. 3r3-31. A couple of years ago we already touched so-called themes warming up the headphones . Then we found out that the manufacturers of headphones are consider "warming up" heresy do not have specifications about the "warm-up" and declare that it does not change anything. In particular, representatives of Shure and Sennheiser noted that Their products are ready for use without additional rituals 3r33333. does not need prior preparation or adjustment for accurate sound reproduction.
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The secret of the ritual “warming up” or why “warm” headphones sound “better”  3r3144.
 3r3144. More than two years have passed since the publication of that post, during which articles from supporters of warming up continued to appear on the net. I decided to further dig the issue and study the impressions of people who tried to feel the effect of warming up. I suggested to my friends who buy headphones to “warm up” them and subjectively compare the fidelity of reproduction before and after the procedure.
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 3r3144. At first I was a little dumbfounded and prepared to write a rebuttal to the opus of two years ago. The fact is that most of those who set up this experiment noted that “sound quality” became “better”, “increased fidelity of reproduction”. I was interested in this paradox and, as it seems to me, I understood for what reason many felt “changes” after “warming up”.
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 3r3144. 3r3111. Briefly about the "theory" of heating 3r3-3112.
 3r3144. For those who are not yet aware of the “heating theory,” I will briefly outline the essence of it. Not a few people believe that as a result of “warming up”, i.e. long reproduction of music or pink noise (from 12 hours and more) headphones, their sound improves. Believers in “warming up” can be divided into 3r3333. several denominations
types, depending on the warm-up time, as well as its methods (music, noise or warming cords with special devices).
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 3r3144. “Scientific” justification is also available. It is argued that, like any mechanical system, headphones require running in, lapping, “shrinkage”, “scrap”, “development”. A mole working in a certain mode (for example, when playing pink noise) allows you to “increase the elasticity of the diffuser”. In practice, it is noted that any changes that may occur in the headphones during “warm-up” cannot be detected by ear and are not recorded by measuring instruments (there are no changes in the frequency response, THD, IMD and other significant characteristics).
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 3r3144. Presumably, a similar effect was observed in the old Soviet dynamic loudspeakers (for example, 75GD1), where “warming up” (running at high volume with pink noise for 80 hours) allowed the low-frequency range to be shifted by 1-1.5 Hz. However, such a change could be caused by changes in temperature, humidity and other external conditions affecting the cellulosic diffuser and it is almost impossible to determine by ear.
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 3r3144. Periodically, a network of video measurements of changes in the frequency response after warming up, for example, this: 3r3129.  3r3144.
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