Virtually any professional company speaker, will upgrade most stock speakers in pinball. Lately, a few LEs do come with better speakers than usual, but not to say they are great.

Most speakers that come stock in pinball machines, are bottom of the barrel quality. Changing just the speakers themselves, does improve what you hear, but will not do anything to give additional amplification, unless you add something from a kit or on your own. You’ll get cleaner sound.