Excellent for OEM systems upgrade, the Hertz DPower4 four channels car audio amplifiers is ultra-compact to ensure effortless installations in the increasingly narrow spaces of modern vehicles or in the factory amp area. The efficient D Class circuit delivers 600 W of maximum power within a compact chassis, an essential requirement for in-car integration. The versatile crossover filter of the DPower 4 enables the user to create a front-rear or front + subwoofer system by connecting two channels in bridge mode. The double SPEAKER & RCA INPUTS allows the DPower4 to connect to any type of source, be it OEM or aftermarket. For an excellent integration with OEM systems the DPower4 is equipped with a smart automated turn on and off circuit according to the factory radio.