Kenwood KCA-RC01A Bass Knob for X502-1, X802-5

Handy bass level controller
If you're planning on using a Kenwood Excelon X802-5 five-channel amp or an X502-1 mono amplifier, you'll probably also want to get this KCA-RC01A wired remote control. That way, you can control the level of bass from your vehicle's front seat.

Product highlights:
wired remote subwoofer level controller
for select Kenwood Excelon amplifiers:
Kenwood Excelon X502-1
Kenwood Excelon X802-5
connecting cable included
warranty: 1 year