There are just two things. First, he can't get the larger speaker to work, apparently because he neglected to hook up both of the cables he had to disconnect in the first place. Though even then there might be problems - the grunge has been so thick on some of those speaker jacks that I've had to desolder them, file it off, then resolder them.
But then he had to tell me that it "made all the difference" in the amount of shake felt through the roof. No shit, Sherlock - only one of the speakers is running, and that's the one with the lesser bass response.
Apparently I'm going to have to come into the bar early, to make sure the system actually functions.