NVX Universal Bass Remote Control - Car Amplifier/Amp Bass/Input [XBRC] Universal Remote Level Control For Car Amplifier/ Amp Bass Adjustment Only requires one additional RCA "Patch" Cable (sold separately) Perfect for balancing the system to changing music styles One 2-Channel RCA Input And one 2-Channel RCA Output Connects between the amplifier and stereo via RCA connectors Universal Bass Remote for car amplifier Adjust the input level going to the amplifier Mounts under dash or through hole Connects between the amplifier and stereo via RCA connectors One 2-Channel RCA input and one 2-channel RCA output