I've had Thiels for over 10 years and agree with most everyone above, the optimum placement for me in my room is 9 feet apart, 5 feet from the front wall and 4+ feet from the side walls with no toe in. I sit 12 feet from the speakers. The distance between the speakers and the distance to your seat are the most important measurements. The soundstage really opens up when Thiels get room to breathe and you need the distance to your seat for the drivers to properly meld for ultimate clarity and transparency.
Not everyone has the room dimensions for that type of placement so my advice is to get as much distance between the speakers as possible and sit at least 10 ft away.
Not everyone has the room dimensions for that type of placement so my advice is to get as much distance between the speakers as possible and sit at least 10 ft away.