Kclone, I sort of agree with the oversimplification set forth by Keithr. He left out some treatments for sidewall first reflections (usually necessary) but included some reference to ceilings which most over look. :-)
But, FWIW, in my opinion you would be best served by getting a good handbook on room acoustics and how you treat them (anomalies). Its far more of a science and the practice is more methodical and very specific to your room than just the application of a little black magic. In fact I would suggest that you spend little money until you have a good understanding of room acoustics, prospective treatments, and are not just reliant on the typical internet advice. Good luck..........
But, FWIW, in my opinion you would be best served by getting a good handbook on room acoustics and how you treat them (anomalies). Its far more of a science and the practice is more methodical and very specific to your room than just the application of a little black magic. In fact I would suggest that you spend little money until you have a good understanding of room acoustics, prospective treatments, and are not just reliant on the typical internet advice. Good luck..........