It’s best practice to be gentle with them at first. When your PA speakers arrive it’s best to start off at a low volume for an hour or so, turn it off, let them rest for a while and then use them again at a louder volume and so on. Don’t simply plug the speaker in and fire it up at maximum volume for its first use. By being gradual, you’ll help to get the componentry working comfortably inside the speaker without things getting too hot or under too much stress too soon.