That is strange Nebor.
If anything, I think mine are too powerful. I typically run them about 2/5 volume/power. When watching movies, they are at their best for me. I know I must have been annoying the other tenants in my building when I got the Return of the King dvd, they were awesome for that movie for me.
Also, another time, one of my friends was over and so I had to show him the power, so I cranked them to about 3/4 power and it was shaking glass and walls pretty badly.
Oh, and as for the original topic, well I remember a debate about this in another thread. From what I remember, someone said that speakers made today don't need to be burned in because they are made in such a way that it isn't needed.