I intended to build a small setup for my local school. Of course the project was strictly on budget and we tried to get the best sounding system we could. Since we couldn't afford the subwoofers, we tried to use the 15-inch loudspeakers. We installed 2 per side and suspended them using chains. With QSC amplifiers it sounds like a wonder. Way better than the old JBL series speakers.
I would highly recommend suspending these speakers, since the 15-inch loudspeaker and 60 degree angle are mostly enough for all small applications. But be careful and use only professional advice, when suspending equipment overhead!
These will be also perfect for a small pub gig w/ subwoofers.