Hello guys, this is my first post on these forums. I will present my setup here and hopefully cooperate with you in order to further improve the acoustics !
Setup :
CD-player > EMM Labs CDSA SE
Pre > Pass Labs XP-10
Amp > Pass Labs X-250.5
Speakers > Usher BE-10 (the old version with beryllium tweeter)
Interconnects & Power cables > Custom made
Speaker cables > Really cheap ones (will have to work on these)
Rig Table > Solid Tech
Room :
L = 690cm
l = 577cm
h = 265cm
Distance between speakers = 360cm
Distance between listening point and each speaker = 410cm
Distance between speaker and back wall = 70cm (a little bit too small but can't do more because the right speaker will block the entrance into the room)
Distance between speaker and side walls = 80cm (side walls are actually a window and the opening to the hall, both covered with curtains)
Rear wall to listener = 190cm (27.5%) > should be more but moving the sofa any further is not too practical
Front wall to listener = 500cm (72.5%)
The ceiling is filled with 10cm of mineral wool
The wall behind the speakers, the large posts and the table are covered with natural stone wich should help with high-mid frequency diffusion
There is one 200x300cm carpet inside the triangle formed by the listener and the speakers
Behind the speakers there are 4 large Gik Acoustics bass traps, followed by 2 acoustic panels and 2 tri-traps. On the side walls there are also 2 acoustic panels and other 2 bass traps on the corners behind the listener

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Sound :
I first started with the speakers almost touching the bass traps behind them and the listening position close to the rear wall (100cm away). The sound was lacking mid-bass and sub-bass almost completely, the focus was mediocre. I played with the speakers by moving them away from the wall behind them and the sound got a little bit better but not much. It was when I started moving the sofa towards the speakers and away from the rear wall when the sound truly styarted to improve. At this point I'm at 190cm from the rear wall and going even further does not improve things anymore. Now the spectral balance and focus are very good (not exceptional). At this point the scene is well defined, the midrange and treble are very delicate and well balanced, the mid-bass and sub-bass is a little bit missing in volume (1-2db, not much). The problem I now find and don't think can be solved by positioning of the speakers or listening point is the mid-bass lacks some of the energy of real life instruments in the 100-500Hz area. As oposed to this, the midrange is very fast. All I can do now to improve things is try some good speaker cables (waiting for your recommendations here) but don't think they will do much about this !