Thanks for the input from all. I also posted this issue in the "speakers" forum. The purchase and installation of an Anodyne bass alignment filter fixed most of the issue for me. It filled out a lot of the bottom end with more extension, vastly more articulation, and cleaned up most of the mud. I now hear a much more even sounding, fuller speaker. What a difference that box made.
I also need to get them off the floor and spike the stands. This should help as well.
I also need to get them off the floor and spike the stands. This should help as well.