I picked up a new (to me) 6x10 today. It's old-ish, and i have no idea what make it is. It's in decent condition, minus a missing dust cover on one of the speakers. I tried it at low volume and it was fine. But i'm worried if more volume might be harmful. I bought it for $80... so i'm not too bummed if it means a new speaker... or can i buy just a dust cover... or do i not even need to worry at all?