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.