There shouldn't be, but technically the T/S parameters can shift if you push them hard enough to where you are heating the voice coil. But it is more of a temporary thing once the signal is not present anymore.

It's really no big deal. However long it takes you to enjoy a pint or two while listening to some tunes on your new speakers. That's "break-in".

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne