Every speaker is different, so there's no set response. However, I would place these speakers at least 1 foot from the rear wall (or the books on the shelf). Put them on stands if you can, as opposed to a shelf.
I would start with them about as far apart as you are sitting from the midpoint between them. Get used to that sound for a day or two, and then move them in each 6 inches. Repeat as necessary, and eventually the image should snap into focus. Try using well-recorded acoustic music for this. You'll know it when you hear it.
I would start with them about as far apart as you are sitting from the midpoint between them. Get used to that sound for a day or two, and then move them in each 6 inches. Repeat as necessary, and eventually the image should snap into focus. Try using well-recorded acoustic music for this. You'll know it when you hear it.