Thank you very much for your help!
Tell me if I am thinking wrong:

-Avoiding the mid Point of the Room with the woofer is because of the risk of inducing energy to the vertical room modes...am I correct?

-1,2 Meters is because of the height from the floor to the ears?



i took 1,41 m for the mid of the room and 1,25 m for the height of the ears (I am quite a tall person)


My current height of the room is 2.85 m. It will be partly lowered because of minimizing flutter echos and get a little bit of the RFZ design. So i take the center of mass of the lowering and half the way is my middle. correct?