Were My Speakers Damaged ?

My "friend" was kind enough to start my system with the volume way up. At least 20 db too much. I don't see any physical damage to my AR2ax's, but they seem to sound a bit thin. Lacking in the midrange. The pots work fine. Am I just imagining a problem? Other than looking at the speaker capacitors for leakage, etc., what else can I check? TIA