Hey guys I have a Carvin BR810 bass cab that gave out right before a show. We were using it to have a run through the set before we went to bar and when we got there, it didn't work. When we plug the head in, sound comes out but you can barely hear it. At first we thought it was the head but we know now its the cab. I don't know much about fixing cabs so could it be something really bad or usually when cabs give out, is it just a wire that gets knocked loose or something most of the time?