Since my back wall behind the speakers was just a blank finished drywall so I had some fun with difference placement .first I put them on chairs ,wood block, 3M table on the almost everywhere on the walls,corners of the room but when I placed them Vertical dead centered on the back wall 2 panels , that where they are going to be for good . My audiophile buddy came over to help me out with the experiment project because it good to have somebody with a little passion to help out . We were shocked how much difference when we were moving them around and we were both agreed when the 2 panels centered on the back wall bring the most improvement by a big margin.