I have not had planars before, but here's what works best for me...
Try the rule of thirds, pull them out about a third of the way into the room, and about one third of the way away from the side walls. That is a place to start. Then use your ears. There are no formulas that are better than your ears because they can't take into account your room and furnishings. That's how I've had the best luck.
Try the rule of thirds, pull them out about a third of the way into the room, and about one third of the way away from the side walls. That is a place to start. Then use your ears. There are no formulas that are better than your ears because they can't take into account your room and furnishings. That's how I've had the best luck.