The D600.4 Diamond 600 Watt 4CH Amplifier is a 4-channel amplifier that features high-grade components mounted on military-spec multi-layer circuit boards. The Diamond D600.4 4-channel amp sends 90 watts RMS of clean, pure music to each of your vehicle's front and rear full-range speakers, with no audible coloration or distortion. Bridge this versatile amp to 2-channel mode to run a pair of subs, or you can set the rear amp channels into bridged mode to run a subwoofer with 300 watts RMS of killer bass, while still sending 90 watts to each of your front speakers. The focused mass heatsink draws heat away efficiently by attaching 75% of its mass directly to the components that create the most heat. The amp's output transistors also mount to the heatsink using a special system that provides better heat flow than commonly used clips. The D600.4 features separate high- and low-pass filters and bass boosts for the front and rear channels, so you can tune it for a wide variety of specific speakers and sub systems.