1500W 2-way active PA speaker system with revolutionary class-D amplifier technology such as enormous power, incredible sonic performance and super-light weight, integrated sound processor for ultimate system control and speaker protection and dedicated 2-band EQ for perfect sound adjustment. One of the coolest things about active loudspeakers is lack of back breaking racks of amps, crossovers and EQs that are often required to make passive speaker systems sound almost as good. Behringer Eurolive D Series Intelligent-Design merges the best features of active loudspeakers with significantly lower weight through use of switch-mode power supplies (SMPS) and Class-D amplifier topology. Instead of operating relatively continuously like Class-AB circuits, Class-D amps switch on and off thousands of times per second, delivering power only as it is needed. 15-inch woofer has about 40% more surface area with which to move air than a 12-inch and that translates into more bass.