The Scosche Loc2slsd amplifier add on adapter is perfect for adding subwoofer systems to any car stereo. This 2-channel adapter is the ideal solution for taking the high signal from your stock stereo or amplifier and then tapping into the stock speaker wire and converting it to a 2-channel RCA signal output. Provides amplifier remote turn on output with removing car stereo. Mountable level control with included adjustable knob which lets you adjust the bass audio levels of the subwoofer directly from the dash. This speaker wire to RCA converter is compatible with high power car stereos up to 80 watts per channel. Perfect for fast installation when adding a subwoofer to your factory car stereo system for a new sound experience. Easy to follow instructions in the package to simplify the installation process. Requires aftermarket amplifier.