6000-Watt Balanced-Current Subwoofer Amplifier With Current Servos.Built-in variable electronic crossover with selectable slope rate. Dynamic Bass Optimization (DBO) - This provides variable filtering with adjustable ''Q'' below 100Hz, far beyond conventional ''Bass Q'' circuits, by allowing the low-frequency output to be optimized for specific subwoofer applications. Frequencies below an enclosure's tuning frequency can be attenuated, preventing damage to the subwoofer and allowing the amplifier's power to be better utilized. Variable phase control Full-range preamp outputs - In the event that multiple amplifiers are used in an application, this feature allows for streamlined system hookup. No high-loss Y-adapters or splitters needed.