Few arranger players have any idea of just how loud a REAL drummer is, let alone on amplified by a PA!
Does anyone honestly think that a 120w PA (total) could even get just the drums up to live level, let alone the rest of the band? A kick drum acoustically can put out more than 100w of sound energy. Stick your head next to one if you don't believe me!

Once again, don't get me wrong. For what it is SUPPOSED to do, it seems a great (if pricey) product. And if you have a drummer with no mikes, playing brushes for cocktail volume music, it might get the rest of the band, as long as the bassist and guitarist had their own amps and didn't need to be in the PA. Then you are only amping the keys and vocals (what it is designed for).

But please! Bose haven't altered the laws of physics..! It will only go so loud before distortion kicks in (pun intended ), and real drums are already louder than it could go.

What wattage are you already using for the PA for the ballroom? Would 100w do?