If you've put the Quattro's deep into the short side corners (along the 13 foot dimension), try moving them out of those corners, a few feet from sides and at least a foot from the back wall. "Sweet spot" is fairly wide, laterally, with Vandersteens, but in my experience sound is a lot more focused when you're sitting down (not standing) in the "zone." The Vandersteen rear-firing tweeter (if turned on) helps ameliorate this problem somewhat. Good luck, and don't be afraid to experiment with speaker and listener position.
How big is the sweet spot for the vandersteen quatro wood CT speakers?
Just fell in love and purchased a pair of Vandersteen Quatro Wood CT speakers. Going to be set up in my living room approximately 13 x21. The speakers will be 13 ft apart. We'll have two chairs. Our heads will be 6 ft apart and 18 ft from the speakers. Has anyone had any success creating a sweet spot that wide (so 2 people are in it)?