Mackie has finally unleashed a subwoofer that does justice to the quality of their HR824 and HR624 monitors. It's called the HRS120, and it delivers a powerful low end punch without sounding muddy or too "boomy." Of course, this 12-inch active subwoofer doesn't "just" work with the HR monitors; it can work its magic with any monitoring system. And the sound these things put out is nothing short of stunning! It's driven by a high-current, 400-watt FR series power amplifier. Lucasfilm THX approved.