+1sheggs said:As well as treating your room acoustically then the positioning of monitors, sitting poistion can make a massive difference.
The best way to check this is to measure the room response, get the waterfall graphs for different positions etc and look for the best response.
There are quite a few different free software packages that you can get for free. I would Recommend REW. Microphone wise for measuring the Behringer ECM8000 is cheap and very good. Whichever microphone you use just make sure it is omni directional. Try out different things with the room set up and try it out
If you need help on getting going go onto You Tube look REW measuring rooms and there are quite a few videos which will help
I also used REW to measure my room response before erecting acoustic tiles to improve the listening environment. REW is quite easy to use and it is FREE.