Most DAL and Duntech speakers have sufficient bass that they will not sound good close to the front wall. Experimenting by 2" intervals I ended up with the front baffle of my Princesses (older sibling to the SC-IV (A)) 48" into the room for smoothest bass response. Also, John's speakers should be at least 3' from the side walls. Because of their dispersion they can be placed further apart than many other speakers, depending on the room. I've hard them with 10-13' separation and that did not leave a "hole in the middle", rather it provided a very big sound stage.
But you cannot simply read what someone else has done and hope that will be best for your system. You MUST experiment with placement in your own room.
But you cannot simply read what someone else has done and hope that will be best for your system. You MUST experiment with placement in your own room.