When you hit the right angle of toe-in, you'll know it. Imaging will still be very specific, but the tweeter won't beam at you. I have had 2 pair of Spendors,(SP100 and 9/1) and their manual tells you to face the speakers directly at the listening position so that you don't see the sides of the speakers, but in practice, that was never the way that sounded most natural. Trust your ears.
