The Reference 5760a's high-output PWM MOSFET power supply ensures optimum power delivery into numerous impedances with low distortion.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.High-level and low-level input are provided allowing you to interface the Reference 5760a with either an aftermarket or factory installed head units.