Alpine RUX-H01 Halo Remote Bass Knob For Halo and Select Alpine AmplifiersAlpine RUX H01 Halo Bass Knob Do you have an Alpine Halo receiver and want to put in an Alpine powered subwoofer? Don't forget the bass knob. Mounts to an Alpine Halo receiver (not included). ALPINE RUX H01. 16' connection cable. General Features: Fits the iLX F259, iLX F309, and iLX F411 9 inch and 11 inch screen Can be mounted to the iLX f411 or used remotely from anywhere in the vehicle Adjust Gain from 0 12 DB Multi Amp Capable (Standard Phone