You need to test them with a different source first and see if they work.
Originally Posted by IEATFISH
I've had some loud sounds shoot out of my A700 due to user error (just like you, sounded like I left my speakers on). So far they have held up amazingly well. That sort of thing blew out my Razer Barracuda's the second day I had them. These headphones never seem to amaze me.
Like others have said, if you can't hear any damage, you're probably fine.