MBQUART ONX1.1600D Onyx D-Class Mono Amplifier High efficiency digital D-class technology mono blocks 4/2/1 Ohm stable Bass EQ with 45 Hz bass boost Military grade PCB 1 x 550W at 4 Ohms, 1 x 1100W at 2 Ohms, 1 x 1600W at 1 Ohm