Dual Electronics DA954D High Performance Series MOSFET Class D Digital Four Channel Car Amplifier with 600 Watt Peak Power CLASS D FOUR CHANNEL AMPLIFIER  your Dual Electronics DA604D High Performance Series car amplifier has specific linear circuitry that improves sound quality and power output while reducing distortion and refining efficiency for unrivaled sound superiority HIGH CURRENT & EFFICIENT MOSFET DESIGN  enables you to have 600 Watts of Peak Power, 300 Watts RMS via 2 Channels at 4 Ohms Bridged, 150 Watts RMS via 4 Channels at 2 Ohms and 100 Watts RMS via 24 Channels at 4 Ohms for unmatched sound quality PASS THRU RCA CONNECTION  for expandability we added a pass through RCA output to easily connect an audio signal to an additional amplifier HIGH & LOW LEVEL OUTPUTS  we added this feature to your car amplifier for versatility in order for high-level inputs to accept speaker output signals and low-level inputs to accept preamp output signals SHORT CIRCUIT PROTECTION  given the vast amounts of power your car stereo amplifier has we made sure that there was a thermal and DC offset safety protection included 1 YEAR WARRANTY  guaranteed high quality and reliability with hassle-free parts and labor warranty with excellent customer service DIMENSIONS  4.7 W x 9 D x 1.6 H