I have a pair of JM Lab Cobalt 816 S, and last night my wife opened a basement door (hollow door not weighing much) and it swung open and banged into my speaker. It didn't hit the grill, nor did it damage the outside of the speaker. It just gave it a moderate 'whack'...not unlike rapping your knuckles hard on the side of speaker. I seriously doubt that anything negative happened, but how would you know if something shook up inside? On that note, how much abuse can a speaker of this nature handle before it is too much abuse? I ask, as I have a 3 month old son, and I wonder about what he might end up doing to my speakers in the future. Thanks.