borrowed from the propellerheds forum.

Your monitors should be firing down the longest part of your room and your listening position should be 38% away from the wall behind your speakers in relation to the length. So for example if you have a room that is 10'x12' you would want to be looking at one of the 10' walls and your listening position should be 4.56' away from that 10' wall. 12' X .38 = 4.56'

Your listening position is basically where your ears are while listening to music sitting down in front of your monitors.

www.gikacoustics.com
http://www.realtraps.com/

Another thing, try not to have your monitors right up against a wall. They should be around 1.5' away at least.

http://forum.studiotips.com/
http://www.ethanwiner.com/acoustics.html
http://www.bobgolds.com/

http://www.realtraps.com/art_room-setup.htm