If you can swing the Rythmik then go for it. Servo subs have their detractors, but for music I can't recommend one highly enough. I've been using subs for close to four decades, servo controlled for almost three, still have both variations. All can be used to great affect, and my twin Dayton Sub 1200's rock with music, but the single servo unit is still better. That's not to knock the Daytons, even with two the servo sub without correction for inflation was ten times the price of both, it should be better.