In my opinion, you'll be wasting your money and time buying bass traps. You didn't say anything about your gear. Do you have a subwoofer? If so, there is a current thread in the "Speakers/Subwoofer" section of this forum that is very helpful in setting it up. If you don't have a Subwoofer, and money isn't a big problem, the new Velodyne "Digital Drive" subs will allow you to "tune" the low end of your system for a smooth Bass response. A cheap alternative to this particular Sub is the Behringer "BFD Feedback Destroyer". It is a Parametric equalizer that costs about $120.00 at most professional music gear stores (such as Guitar Center). To set it up, you need to also get a Radio Shack sound level meter. Here is a link that tells you how to set it up, step by step. Hope this info helps.
http://www.snapbug.ws/bfd.htm
- Rutgar