playing breaks it in just fine in IME, but others prefer a more regimented approach, and some take it a bit far IMHO
my favorite audio break in tone
they recommend running this signal through your speakers at high volume for up to 100h (neighbors?),
also cables interconnects, preamps, signal capacitors (most auidiophile caps require at least 100h break in before judging their sonic character (or huge expense))
this is my iPhone alarm tone, it cannot be ignored...