At volume levels which are safe to your ears, put your ear up to each of the midrange and bass drivers with some music playing that contains some decent midbass and bass. Like the others mentioned it looks like its possible that the bass drivers are not functioning correctly (which could be caused by the crossover, faulty driver or loose wiring/connection).

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne