I doubt it would be shipping damage that would cause a faulty crossover. That speaker would have to take one hell of a beating for that to occur since it is so well protected by the packaging as well as the cabinet. It could also be something as simple as a loose connection(s) somewhere. Doesn't really matter however since they are sending you a new speaker.

Good luck and hope you get the replacement quickly.

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

-Max Payne