Scosche LOC2SL-WM1SD Car Stereo 2-Channel Audio Amplifier Add-On Adapter W/ Remote Black. The Scosche amplifier 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 Mountable level control with adjustable knob included that 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.