There are several ways to tackle obnoxious bass. Obviously, you can turn down the volume, but if the bass still dominates you can try repositioning your speakers or consider bass traps and other room treatments. An equalizer will get the job done but will likely alter the tonal balance and shrink the soundstage. I am not a big fan of digital signal processing, but the technology is better than it used to be and could be considered. Personally, I would ditch the big bass monsters and get more balanced speakers that work better in your room!
Speakers with deep/powerful bass
I used to have a system with large speakers. Each speaker had two 12" woofers. When I would play Hard as a Rock from the AC-DC BallBreaker CD there was a moment at 35 seconds into the song when it felt like someone was jumping on the floor behind me. This would only happen if my JPS Labs Golden Flutes were looped into the system, and it was playing very loud. Without the Golden Flutes it didn't happen. It was a truly frightening experience the first time it happened, because I was home alone. Has anyone else had anything like this occur?