Well My room is very odd in its layout. The fact it has solid stone walls on three sides and a false wall on one, And it has three alcoves make getting good acoustics and bass response is a problem. The ceiling is pretty high as well. So I went armed with £20 to Focus diy and have bought some polisterene wall tiles and 4 x90% coving also polisterene(sp). The idea is to try and tame the high end reflections,and create bass traps in the corners(this idea came from Uncle eric). I have put the coving in the corners up to a height of 48" (and sorted the skirting board as well) and tiled around the Subwoofer wall. I have also tiled around the side walls up to 48" for the first 1/4 of the room. (this is a dedicated cinema room and i have no missus to worry about). Whilst in Focus I also noticed underlay blocks that are 1" thick and made from material that will be fantastic at sound absorbsion, I intend to put this on the screen wall and then cover with Black material, that will allow sound to travel through it,and be absorbed. But at the moment i am just experimenting with things(last thing i want to do is actually make the room too dead.) I am hoping to kill all standing waves from the sub, and get a more even response from it, as well as tighten up the top end and get a better focus to the channels. I have yet to fire up the system, shop below still open, but will report back with some findings soon. Its good fun though.