+1 for room treatments.
But before you take that step, make sure the room is optimal for sound. The room is the biggest factor in how the sound produced by your system actually "sounds" by the time it hits your ears.
That means where the speakers are located with relation to the walls (at least 2-3' away from back walls, more from side walls, not on shelves and not next to TVs or stands) and to the listening position (are they in the proper equilateral triangle, or whatever setup the manufacturer recommends? have you experimented to find the optimal toe-in angle for soundstage, imaging, center vocal clarity?). It means a rug on a bare floor, and objects to break up flat coffee table surfaces. It means curtains on windows, bookshelves on walls. It means not having the listening position against a wall.
Are you running the speakers 2.1 with a sub for music? What kind of speakers and sub? How do you have the bass management set up? Where's the sub? Have you optimized the phase and crossover settings, along with sub placement, for smoothest response?
Once all that's done, then you can start thinking about room treatments. Which can completely improve the sound, depending on the room's inherent acoustics. At the very least, bass traps in corners will tighten up bass and low mid-range, take away boominess, and reveal tons of detail in bass. This also improves the rest of the sound by making it more balanced and detailed.
You can take a stereo system (amp, speakers, etc.), and it will sound completely different when placed in every room. That's why you want to minimize the room's effects so you can hear more of the sound of the speakers and equipment, and less of the room's effects on the sound.