Well, I'd like to see those 15" and sub systems do 'quiet from front to back' like the Bose do...

To get a conventional system up to listening levels in the back of the room, those in front of the stack HAVE to have it quite a bit louder. That's the Bose's one and only strength, IMO.

If I needed that often, I MIGHT consider a pair... If I hit the lottery, that is

To be honest, most of the places that want background levels evenly distributed in my area have house systems that you jack into, though.