Okay now you are questioning the holy grail. 1st reflection points.
I built 12each of 2' x 4' x 2" Owens Corning 703 absorbing panels.
In a room of 15' x 18' open to other rooms I deployed 2 panels on the ceiling, 2 behind the speakers, 2 for early reflections and 2 behind the listeners. Floor is carpeted.
The difference was so profound I nearly cried.
Now your post makes me question which panels are the most critical.
I built 12each of 2' x 4' x 2" Owens Corning 703 absorbing panels.
In a room of 15' x 18' open to other rooms I deployed 2 panels on the ceiling, 2 behind the speakers, 2 for early reflections and 2 behind the listeners. Floor is carpeted.
The difference was so profound I nearly cried.
Now your post makes me question which panels are the most critical.