SCOSCHE LOC2SL Car Stereo 2-Channel Adjustable Amplifier Add-On Adapter in Black ADD SUBWOOFERS: Works with high power car stereos (up to 80 watts per channel) to add subwoofer systems to any car stereo. EASY TO INSTALL: Provides amplifier remote turn on output without removing car stereo. OUTPUT CONVERSION: Converts car stereo speaker wire outputs to RCA Cable outputs. ADDITIONAL CHANNEL: Allows the addition of 2-channel or mono amplifiers to factory or aftermarket stereos. CONTROLLER: Includes mountable remote for adjusting subwoofer level from the dash. REQUIRED FOR USE: You must have an aftermarket amplifier in order to use this product. BUY WITH CONFIDENCE: Backed by Scosches Lifetime Tech Support and Limited Lifetime Warranty.