The tilt is due to the height placement of each speaker, but thanks I will be able to adjust the aiming of the back surrounds. My main concern is the side surrounds due to the opening on the right wall will force me to place them 3-4" in front of the main seating area. I remember reading that side surrounds should be place 3-4" to the rear of the main seating area for a more diffused effect. I guess what I should be asking is how strong of presence do the back surrounds have, or will it be like having 4 surrounds with the same effects coming from the speakers.