ROKKER! -P series-- THE world s most effective 4-ch amplifier for your Harley Bagger audio system ... This interesting new J&M DSP managed 4-channel 500w fairing/rear speaker amplifier kit has actually been developed particularly for use on the 2 Harley Ultra Classic with the Harley HK radio. This is a complete variety class G digital amplifier and is spec d at 125watts RMS per channel X4 channels. (500w total) driven constant into a 2 ohm load @ 14.4 vdc. These new ROKKER XT -P series amplifiers are now completely programmable thru the internal digital signal processor (DSP) and come out of the box currently dialed in for this specific Ultra-Classic speaker configuration. to supply maximum freeway performance from your Harley Davidson audio system. Must you want to change these settings (as when including added speakers to the system. including a subwoofer. or altering the impedance ...