Hi Glenn:
Thanks for your reply--just getting back after the holidays. I am pretty limited to the wall behind the speakers for any treatment options. My listening position is up against the front wall and there are nice framed photos from the Francis Wolff Blue Note series just above my head. One sidewall has a large window and the other a large bookcase--not ideal but this is a living room system rather than a dedicated room so I have to work around furnishings etc. Other than the rack, the wall behind the speakers is fair game if I can find something that will add to, rather than detract from the décor. How would art panels in this location improve the room acoustics?