Rockford Fosgate T400X4AD - 400 Watt 4 Channel Amplifier


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Big Reliable Power

The T400X4AD is a powerhouse of an amplifier. This is one of our favorite amplifiers to use in the fairing. With twin fans this amp stays cool even in extreme weather. Built for high vibration, high humidity, and heat, these amplifiers thrive where others fail. We also have amp racks that we make that are specific to this amplifier if you want to mount it in a saddlebag. Perfect for use with factory radios or aftermarket. This amplifier works great with our '14 & up plug & play signal harnesses. 

Ultra High Efficiency and Small Footprint Makes This Amplifier Perfect for Any Harley Stereo System.

  • Balanced RCA type inputs makes this amplifier perfect for both factory and aftermarket radios. 
  • Bridgeable for ultra insane powerful full range output to a single driver.
  • Built in adjustable high and low pass crossovers
  • Designed specifically for high vibration, heat, and moister applications.
  • Charging system friendly to Harley stator and battery.


  • All '14 & up Harley Street, Road, Ultra, & Electra Glides in the fairing.
  • Fits our saddlebag Bond-In amp racks.


  • 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
  • 2/4 channel input switch
  • 4 Ohm bridged capable
  • C.L.E.A.N. input/output clip detection and indicator LEDs
  • Top mounted controls
  • Dual fan cooled
  • Real time thermal sensing
  • Dual extruded heat sinks
  • Discrete surface mount technology
  • 2 Year Warranty!