Put some tube traps in the corners behind the speakers if you can. You can buy pre-made traps like those from ASC or Real Traps, or you can DIY a pair very easily.
I have a DIY set (6" panel depth, but 4" would work too) that has a nice wood frame around the panels with a acoustic suede fabric covering it. They are also on stands so they can be moved around easily. If you click on my system link you can see them.
I've seen panels made from art prints as well. Lots of options when you DIY.
I have a DIY set (6" panel depth, but 4" would work too) that has a nice wood frame around the panels with a acoustic suede fabric covering it. They are also on stands so they can be moved around easily. If you click on my system link you can see them.
I've seen panels made from art prints as well. Lots of options when you DIY.