The Power TM400X2AD 400 watt 2-channel ultra-compact amplifier is built on Rockford Fosgate's proprietary class AD-technology, featuring constant power to produce the same output at both 4-Ohm and 2 Ohm impedances. Top mounted controls allow easy access to built in crossover and C.L.E.A.N. input/output clip detection circuits.; Rockford Fosgate proprietary class AD technology 4/2 Ohm muti-impedance constant power Differential inputs with high level auto turn on feature 8 AWG power/ground connector w/ upgraded RCA connectors Remote-out feature when using high level inputs 4 Ohm bridge capable Dual fan cooled 2013 PLC2 remote ready Top mounted controls Real time thermal sensing Dual extruded heat sinks