Great site John, what a wealth of useful info. I would like to know the minimum percentage of wall area that should have bass traps, panel and slat style, to be noticeably effective. My room is 10.5 feet by 10 feet with a 7.5 foot ceiling. It has paneled walls over wood frame, and a carpeted floor. The ceiling is some type of material similair to acoustic ceiling tiles but thinner. I have done a crude test for standing waves by playing a sine wave and checking spl's with a inexpensive sound meter. This is the first time I have got in this deep with the acoustics, and I was amazed at the bass buildup in the corners. At mix postion there is a 16db drop at 125 hz compared to 63 hz and 160 hz. I do have trouble with the bottom end of my mixes. While acceptable, I know it could be a lot better. Budget and space are both scarce. I hope some of the info I included helps.Bill