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Originally Posted by thomas
I did some treating behind and at the side of the speakers. The wall I'm facing has been decorated with 'egg' foam.
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Foam is pretty much useless. Actually it becomes counterproductive in that it muffles the high frequencies while doing absolutely nothing to anything below 200 Hz.
Broadband absorption is what you need, and that's provided only by a handful of materials (none of them "environmentally friendly", unfortunately...) There's a way to make super-effective corner traps on the cheap, and that's by buying Dow Corning 703 sheets (you don't need the thicker 705's because you're going to stack them anyway and 705's are considerably more expensive), cut them in large triangles and stack them one on top of another, floor to ceiling. Do that to every corner in your room. Then you can use extra 703 panels to treat early reflections and critical spots (a so called "cloud" --basically a 703 panel suspended 1 ft from the ceiling and placed right above your head-- is also of great help.) Don't forget to cover all the panels with non-porous fabric (yes, you need to surround the panels with wood frames and use a staple gun to seal the fabric) as fiberglass is not exactly healthy if it gets in your lungs...
If you think it's too much work and you don't feel confident enough to do it yourself, contact the guys at realtraps.com and they'll do it for you at reasonable prices.
Possibly everything in your room should be symmetrical, in order to preserve an accurate stereo image.