Rockford Fosgate Element Ready Power 400 Watt 4-Channel Amplifier The TM400X4ad is a 400 Watt 4-channel amplifier with high efficiency Class-ad technology and a conformal coated PC board designed for motorsport applications Features: Built using Class-AD technology, amplifier produces constant power to produce the same output at 4-Ohm and 2-Ohm impedances Features auto turn-on due to flexible low-level and high-level inputs Top mounted controls allow easy access to built-in crossover and Clean input/output clip detection circuits Has 3-stage thermal lock extrusion with dual fan forced induction keeps everything cool while real-time thermal/protection schemes safeguard the amplifier 8 AWG power/ground connector with upgraded RCA connectors is included 2/4 channel input switch Capable of producing 4 Ohm Dual extruded heat sinks Marine grade two-part epoxy coating on circuit boards 2-year warranty