DIY acoustic room treatments

Looking for some advice on do it yourself acoustic room treatments. What products work the best? Thanks

I am currently using diffusers made up of egg crates, burlap cloth, and 2" X 2" wood constructed as a rectangular frame. It works best on taming the back wave out of my ESL speaker panels. It also made the bass sound a tad cleaner. I positioned them directly behind the back of the panels (on the back wall about 2.5 feet) from the speakers. I also positioned one behind my center channel speaker for my HT applications. Maybe you can experiment on this and hope that it will make a difference on your system.

Make sure that you optimized your speaker placements on the room too, before considering treatments. IMO, this is what other enthusiast neglect to spend time with. Proper speaker positioning will surpass any other room treatments that you may consider as far as immediate "impact" is concern.

Hope this helps
jon risch stuff is well designed and has a great following on the asylum web site