Crunch DRA1850.1D V Drive Car Amplifier V-Drive technology powers these amplifiers with beefed up circuitry plus clean and powerful music power SEPP (Single Ended Push Pull) A/B Class 2 and 4 channel amplifiers for the sound quality required for great musical power Mono Block amplifiers deliver powerful sound quality with high power and efficient D-Class power V-Drive 3P Power supply with Twin-Coil Isolation Design (TCID) power supplies for maximum efficiency in converting 12volt power into huge watts through the amplifiers 1 x 450 @ 4 Ohms, 1 x 900 @ 2 Ohms, 1 x 1800 WATTS @ 1 Ohm D Class