Having investigated a couple of audio forums in search of recommendations for budget audio monitors, I've also come across much info about the importance of acoustics treatment for your listening environment. The most hard-core of audiophiles say that it's just as, if not more important to have the right surroundings as the right audio gear.
One of the biggest names in the acoustics-scene is Ethan Winer (puns about the name being suitable comes to mind), who runs Realtraps, a company making products specifically for absorbing various frequencies.
Here are some pictures from Winer's own livingroom.All those big white things hanging everywhere are various kinds of traps for absorbing problem frequencies.Crazy.
The more basstraps you have in a room, the flatter and tighter the low-end will be. It really is that simple.Very well if you run the company making them, but regular people probably won't be able to invest hundreds to thousands of dollars in their listening/recording room.
If you have the time/interest, check out the instructional videos they have to see how serious these guys are.