All HFV Bass knobs now come with upgraded 30" RCA cables with protective sheathing as shown in last picture.

NEW HiFi Vector XL RCA level control for car audio amplifier. 

Black With red LED VOLTMETER.  Voltmeter also has on off switch in case you want to turn it off.


High quality components are used to ensure the knob will be smooth and accurate for many years to come.




  • High quality potentiometer is used to provide a smooth long lasting bass knob
  •  knob is easy to adjust one handed with you finger or thumb
  • Input and output RCA's clearly labeled
  • 2 channels in and 2 channels out
  • 12v wires for voltmeter with pigtail connector so you can remove knob rom vehicle if needed without cutting 12v wires.
  • Has on off switch for voltmeter



  • 34" overall length (including cables)
  • Dimension OF KNOB (not including cables)  approx. 1 3/4" x 1 3/4" X 3.75"