Remote Level Control offers remote level control of the amplifier. Once the on-board gain control is set, the PLC2 can attenuate (and not increase) the level from that point. Cable and mounting hardware included. For use with select 2013 and newer PUNCH and POWER amplifiers. The PLC2 is compatible with the following Rockford Fosgate amplifiers: P300X1 P300X2 P400X1 P400X2 P500X1bd P500X2 P600X4 P1000X1bd P1000X2 P1000X5 T750X1bd T1000X5ad T400X2ad T500X1br