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Audio Myths... A mostly civilized discussion
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Lots of posts on here about burn-in, here's my $.02
Any material that moves during use, fluctuates in size over time, or is made of a flexible material, can experience burn-in.
In my experience, the degree of burn-in (and thus how noticeable it is) correlates to the degree a given material exemplifies the properties listed above.
Take a planar magnetic driver, nothing is moving, it's not made of flexible material, and it does not fluctuate in size.
A dynamic driver on the other hand, moving constantly, doesn't really fluctuate in size, but the cone can be made of a variety of materials ranging from relatively inflexible (mylar) to very flexible (biocellulose).
IMO, burn-in exists with dynamic drivers and electrostatic drivers. It does not exist with planar magnetic drivers, amp circuits, DAC circuits, circuits in general, or cables.
Some solid state or non-moving electronics components, like your computers CPU, will also experience a burn in period. This is more related to how it handles heat vs voltage, as the whole thing needs to sort of cook itself to distribute power properly and as intended. However this is negligible, and probably doesn't make a shred of difference in the chips of a dac / amp. Anything that moves around? Heck yes, as parts are loosened up (like a glue seam on a cheap dynamic driver, which will cause it to fire in a non uniform fashion, or the foam rubber cone suspension ring that needs time to reach it's intended flexibility). These parts need to naturally find their path of least resistance to function optimally, even with nM based tolerances!