I've tried both absorption and diffusion behind my speakers at the front wall and in the end removed them and now don't use anything behind them. Instead, the corners are treated with bass traps, the upper corners with Eighth Nerve triangles and the seams where the ceiling meets the wall with Eighth Nerve rectangles. Unfortunately Eighth Nerve is no more, but their concept on how to treat rooms is very effective for me.
As previously mentioned one can eliminate many room interactions by listening near field, which due to my room configuration is really my only option. You might also want to post this over on AA. There are some great resources over there, especially David Aiken, who have helped me address this issue, especially the best methods to use diffusion.
As previously mentioned one can eliminate many room interactions by listening near field, which due to my room configuration is really my only option. You might also want to post this over on AA. There are some great resources over there, especially David Aiken, who have helped me address this issue, especially the best methods to use diffusion.