My suggestion with no merit of scientific rules.:
40 inches from front wall. 12-24 inches from side wall. Sit at around 12 feet from it. Slight toe-in for sure. Make sure you stands are filled with something inert. The Concertino needs it. They vibrate like my Dad's Proac 1SC on stands. Lots of blue tact on the bottom. If you have something to deaden the sound behind you sitting are the better. Like plants, bookcase, wall rug.
Try that out. I do like the Concertino. But for the price this sounded as good for a little less than its price.
http://www.usheraudio.com/speaker-x719.html
