Quote:Not really. The properties of capacitors will change over time, but that time is measured in years and decades, not hours. Inductors remain stable forever, as do resistors unless you burn them out with excess power. Resistors can have some shift in value with temperature, but that shift is only temporary, they return to the normal value when they cool down.
Quote:Break in takes time, and time is money, so very few speakers are broken in at the factory. The user doesn't need to do anything special, just play them. I break in woofers before testing a design, as I need to know how it works after break in, not before. I do so overnight, with a 20 to 30Hz sine wave, before mounting the driver. You could do so with new speakers, if you want them to sound as good as they'll get from day one, but it's not that big a deal.
What I know for sure is that all this is a natural process there is no need for especial sounds unless like bill said( unless is done under testing conditions) that means at the factory.