I have upgraded my sub from the Paradigm Seismic 10 to the Paradigm Servo-15 v.2. This sub provides more bass authority with very accurate control due to its large servo driver mounted in a acoustic suspension enclosure. The Seismic 10 was working out will except not enough low end bass. I think there is nothing better then having a massive amount of cubic inches and a servo driver to have that full range of subsonic with control. I am extremely pleased with how well it complements my ML's!