Burn is isn't just a mirage, but it's poorly named. The driver vibrates, which creates waves in the air that become sound. The manner in which the driver vibrates is crucial -- manufacturers try to construct drivers with materials that are stiff enough to avoid exaggerated vibrations, but not so stiff as to minimize vibration. It's a difficult balance, and at the high end manufacturers opt to err on stiffness to promote accuracy. But as these speakers get worked out, there is some loosening, which is part of the design. Often I've read that somewhere between 40 and 100 hours is sufficient.
This will not be relevant for the HiFi, I think, because the drivers are not constructed of anything but standard paper, and if it does loosen up, it will likely reduce accuracy, and promote "warm" sounding base, with minimal mid to high frequency separation. You will loose violin amidst the cello, and flute amidst the sax, and so forth. It will not matter as much much if you've just got a guitar, drums and base. If you've got drivers that are very tight to begin with, the speakers will sound harsh and "bright", but will settle down after a while. That's burn in, and you wouldn't have heard it (even if you've listened to music for 40 years) unless you purchase new , expensive speakers with certain types of drivers. HiFi won't be one of them.