I must agree with SH.
While new speakers can often have significant "break-in" periods, I believe that people are far more likely to have "ear/brain break-in" than solid state electronics.

I do have a related question however...
When turning on a cold solid state amp, how sigificant can the difference in sound be, as compared to a hot (warmed-up) amp?

In most cases, my ears and the amp start warming up at the same time, so it is often hard to tell how big the sound shift might be.

I believe that the optimal design operating temperature for most amps is probably on the hot side. Some amps are said to sing best when they are hot enough to fry eggs. Any thoughs or observations would be appreciated.

Allan