ok, so, the positioning is near perfect, i made a quick diagram with room dimensions and seating positions... the green line is not a wall, its just an imaginary line separating sections of the room... the black lines are walls that have an arch in the middle on the right that leads to the rest of the house, blue is furniture...
all the speakers are on ear height level (~1.2m) and tilted about 30 degrees inwards... only red flag i can think of is distance of front speakers from walls, 30cm on the side (and thats on the left, on the right its about 1.4m) should be ok but on the back of the speakers its no more than 10cm distance, if that... more like 8cm...
i measured levels with high quality noise meter (B&K 2250) and they are near perfect on 2 prime seating positions in the center, all the speakers are within 0.5dB from each other... this probably comes from the fact that right side is much more open since the left side is 0.5dB louder, both fronts and back...
on that note, should i lower the bass thru general bass control (all channels) or just lower the bass frequencies of front speakers thru EQ, primarily the ones that the speakers arent rated for >40Hz? whats the better approach?
also what about the rule of thumb that i read on here that speakers should have their xover set to 1/2 octave higher than the specs? my cen/sur are rated at 75/80Hz should and by AH recomendation they should be set to 120Hz...