They are the same, but they are made sturdier. Not unlike a Jeep CJ and a Subaru Forester are both 4WD, but which one would you rather take mudding?
I don't know what you mean by "big cabinet speakers" but big doesn't necessarialy mean they will withstand the rigors required by being asked to reproduce rlive vocals which haven't had the benefit of going theough mixing consoles, limiters, and various other processing before being committed to a disc. Raw vocals can be brutal on speakers.