Still testing! I managed to correct the 1000 to 2000 hz dip but it created a huge dip at 70 hz. I put the bass back. By listening the difference between a dip at 70 hz is far more noticable than a 1000 hz dip. Note also that 1000 hz and above are more impacted by sitting position than 70 hz and bass in general. 1/6 smoothing Purple = old Grey = new RT60 I still experienced room mode and speakers placements. It is fascinating how some frequencies can almost completly disappear. Everyone should try this with REW and a DAC. I found a wall that causes a big reflexion. I need to find a way to treat it. Since it's a wall that can be see when you enter the house I need to find something more appropriated.