For sure not one sub. It may make your system sound worse-it did for me. Two subs at a minimum, 4 being best. As has been previously mentioned-the biggest effect of adding subs is how it cleans up the sonic clutter in your room. The second effect is a tighter more natural bass. The audiokinesis swarm is a great value and would likely work well with your speakers. I had one in place for several years, until I realized my Magico S7's with 3 10" woofers each were running over the 4 10" subwoofers in the swarm. I switched to 4 B&W DB1D's and the improvement was astonishing. If you don't go with the swarm, I would recommend that you chose a sub with DSP capabilities. Again, at least 2 subs!
