Need Acoustic Panel placement suggestion for this Room

I currently have a 3.0 Setup in my living room. I have already done everything necessary (placement, toe-in, cabling, room calibration[XT32] etc) as far as equipment is concerned, to make them sound their optimal. I have come to the point where I think it is the room more than anything else that needs to be treated to achieve the improvement in sound. I have already read through the forums regarding acoustic treatment and have visited all the links that are most commonly provided when anybody comes here asking for acoustic treatment suggestion. Unlike when I did my research for equipment, I haven't been able to clearly make an assessment as far as the placement of acoustic treatment is concerned. Since the treatment is more specific to the room, rather than a general rule of thumb, I have decided to reach out to the experienced people in the forum. I will try to provide as much detail as necessary on the room to be helpful in order to get a better understanding of the room.

The room is carpeted with an 8 foot concrete ceiling. The room dimensions are 20' X 9'. The distance between the TV/speakers to the listening position is 8'. The wall(of the closet) on the left side of the TV is layered with a mirror. The opening on the right side of the TV is the door to the balcony.

I am specifically looking for the placement of the acoustic treatment in this room. When I say that, I mean where exactly should, the panels be placed in the room. I would appreciate it, if the suggestions can stay specific to the placement and the kind of panels that are needed. I would like to politely appeal to not provide any links for further reading on the science behind acoustic treatment.
Edited by enthusiast8 - 1/30/13 at 5:18pm

Thanks fred for your suggestion. Doesnt anything need to be placed behind the speakers too, on the back wall?

Wow....I am hearing crickets....
..Guys?...........anyone....

Haha. Thanks mazeroth for figuring out the root cause.

For a start I already have four 2'x4' acoustic panels that have 2'' OC703. I would like to place them at the right spots to begin with, and add more (panels, traps, diffusers) as needed.
Should I start with 2 panels behind the speakers, and 2 behind the sofa (or 3 behind speakers and 1 behind sofa) ? At what height should I be hanging the ones behind the speakers and the ones behind the sofa?
As for pulling the couch away from the back wall, its going to reduce the viewing distance from the TV. How much away from the wall should it be moved, keeping that in consideration?

My goal is to obtain a more enveloping sound and improve dialogue clarity, fix the slightly recessed highs and have a tighter low end.
At what height should the panels be placed?

Thanks GIK for the tip on the panel height.
Do you think the mirror wall to the left of the TV is a major concern? Anything I need to do on that will hurt the aesthetics of the room.
Where in my room, do you think the corner traps can go, primarily?

OK. So far here is what I am planning on doing

1) Add two panels directly behind the fronts, centered to ear height.
2) Move the sofa to be 6 inches away from the back wall.
3) Add two panels on the back wall.
4) Add a bass trap on the upper 3d corner of the back wall and the mirror wall.
5) Add a panel at the first reflection point on the mirror wall. (Aesthetics permitting)

Is there any other place I need to add more panels?
Where exactly do I place the panels in point number 3 above? Do I place the panels directly facing the main speakers at a height (what height?). Or do they go facing in between the front speakers?


Edit : fixed wall confusion
Edited by enthusiast8 - 1/24/13 at 1:29pm

Thanks Alexander for the clarification.
Maybe I missed this from your suggestions, but where should I be placing the panels on the back wall? Meaning, at what height? Should they be directly opposite to the panels on the front wall? Or should they be facing the space between the panels on the front wall?