Quadcast, 4-channel amplifierRated at 75 W x 4 @ 2 Ohms (300 W total)Features R.E.M.I.T. circuitry for excellent FM reception from a Class D ampMade specifically to work best with factory Harley-Davidson radio no crossover, gain or EQ adjustmentsIncludes 100% Plug-and-Play wiring and all required hardware to complete the installationCan easily link to Hogtunes REV 225-RM part # 4405-0490 (sold separately) to create six channels of power (both amps inside fairing)No radio re-flash is required