Kirk, you have mail.
Great thread link vintagebob and I love the title I will have to hang there some too.
I will mosey over to the Acoustics Circle and check that out.
Room info: Placements are just preliminary.
Not knowing your room, but knowing your speakers and having a slightly larger room, I think that you might consider bringing the speakers out another 12" (the speakers are 17" deep; and having the baffles 36" away from the front wall leaves only 19" behind the speakers), moving them away from the side walls another 6", and moving your chair forward another 6", making your triangle 84" (you don't want to sit any closer than 78"-84", and you might need to toe-in the speakers a slight amount).
You will need tri-corner absorption, and lots of it, and absorption (and/or diffusion) behind your chair, behind your speakers, and at the first reflection points on the side walls and ceiling. I think with a 12'X14' room, you will need a lot of broadband absorption/bass traps. I believe 6" or thicker panels and/or bass traps would be best. If you DIY, the cost difference between the different thickness panels is not very much.
I already have (14) 6" panels, (4) 4" panels, and (4) 2" panels, and I am going to add another (8 ) 6" panels to tame the bass even more. It's not the speakers, it is my room. If the room were larger, there wouldn't be anywhere near as much of a problem (it isn't a big problem; I just keep trying to reduce any boom, but my system sounds great). When you get set up, Ethan has a link to a pink noise file on the Acoustic Circle. When you play the pink noise through your system, you can hear exactly where the boom comes from. Rigid fiberglass is your friend.