Hmmm...burn in, break in well we all have burnt something toast for instance. But not speakers many mechanical things get smoother with use they also wear out over time. I have to agree with the just play the speakers and enjoy crowd. All the speakers I've owned have been swapped back and forth with different equipment and in different rooms sometimes sounding better sometimes not. It seems that speakers do change over time but so might the source driving the speakers. So if your speakers sound better to you over time then they are, or you are burnt in.