Dj sound level

Is this a concern you are addressing during interviews or after you have signed the contract?



For example, while we do have a good size dancing crowd, an equal number don’t dance and prefer to mingle.
I recently attended a birthday party with a pro dj and the music was so loud you couldn’t talk to anyone. So we won’t be going with that particular vendor. But other djs we have seen don’t blare the music. Is this a common occurrence or just a fluke from a bad vendor?