I'm using the 705AS's and you have to be very careful what you pair them with. They're great at filling in the bottom end below my ART422A's, but if you pair them with anything that is less capable above 100hz then you end up with some odd gaps and you have to be very careful how you set the gains on the subs and tops (otherwise you can end up with bass notes that sound very loud and very out of place!)
They'll vibrate glasses off the bar at 20 paces though for the notes between 20hz and 100hz
Julian