I got a free room analysis from GIK and they recommended soffit traps floor to ceiling in my room as a start. They also gave me recommendations for incremental additions since i did not want to go all in to start. After having the soffit traps for a few months and experimenting with placement, I have found that moving the traps six inches out for the corners and side walls resulted in a much more satisfying level of clear, defined bass as well as improving the midrange and soundstage. I would recommend the folks at GIK highly.
Room Treatment suppliers
I know about GIK and ATS. I stumbled across another supplier on here that had some really well done art panel and diffusers but can't remember who it was. What are some of the other supplier besides aforementioned?