The RBC-1 remotely controls the Bass Level of the following JL Audio amplifiers:
RD-Series: RD500/1, RD1000/1, RD900/5
When the RBC-1 is connected to the above amplifiers, it acts as an attenuator on the input gain of the amplifier and is used to adjust the overall level of the amplifier from the front of the vehicle. Use it as a Subwoofer level control.
The RBC-1 kit includes the rotary control with a black ABS knob, mounting hardware and one 18 ft. (5.5 m) cable.