Its possible that whoever made the recording, did a poor job. Maybe they did al1right with the musicians on the front of the stage, and messed up on the rear.
Also, disconnect one of your speakers and listen to the one that's still connected.Then do the other speaker. If one side sounds ok and the other doesn't, it will help isolate the problem.
Also, disconnect one of your speakers and listen to the one that's still connected.Then do the other speaker. If one side sounds ok and the other doesn't, it will help isolate the problem.