I currently have JBL Studio Series for front/center/rear. I've replaced the fronts with Athena AS-F2s and am trying to decide the best way to go for the rear speakers. My room is 14x13. The seating is directly against the rear wall. I currently have S26s mounted on the rear wall with some heavy-duty Vogel speaker mounts. The rears are angled in towards the center of the room. My question is, which rear solution would be better? 1) Use AS-B1s for the rear, utilizing the existing mounts and angle them in towards the center of the room. 2) Use AS-R1s for the rear, mounted flat against the rear wall. My concern was whether the R1s would work well being mounted on a rear wall. Are they designed to be mounted on a side wall, or will they work in my situation? If the R1s can be mounted on a rear wall, how far in from the side wall do they need to be?