Audiophiles are slowly acknowledging the importance of the listening room, which many agree is as important as the gear itself. High-and mid-frequencies are fairly easy to tame with absorption or diffusion, especially at the first reflection points. This can be done with specially designed room treatments, or with furniture, plants, curtains, etc. The more difficult problem is bass frequencies which, because of their extremely long wavelengths, are very difficult to absorb. Bass traps can be helpful but they are necessarily large, one needs many of them, and they often over-damp the mid and high-frequencies. Recent advances in digital processing now provide an alternative, and highly effective means for dealing with bass problems.
DSPeaker manufacturers a variety of affordable, user-friendly products that correct room-induced bass problems.