Axxess AALC Remote RCA Level Controller (Discontinued by Manufacturer) Dash Mount Amplifier Level Control for Volume Adjustment Can Adjust the Amplifier Gain While Driving.Mounting tabs for convenient mounting locations Perfect for Balancing the System to Change Music Styles Connects through RCA Level Inputs and Outputs Ideal for bass control or front to rear volume control between amps Remote level control can be used to control the volume of an amplified hard wire to it Ideal for bass control or front to rear volume control between amps