Thats a poorly photoshopped picture of how I was thinking of placing Acoustic panels on one of the walls in my HT. The colors aren't accurate, its more about placement/arrangement. The panels are 2x4, 2x3 & 2x2 feet and the wall is just over 14 feet from corner to window.
Here is a link to an older pix of the whole room for context. I will be doing more than just this section. What do you think?