JL Audio Clean Sweep Audio Interface - CL441DSP

The unit is in excellent condition, has both wire plugs and the accessory cable and volume knob. This is exactly what you need to add amplifiers to your current car audio head unit without needing to tap into the factory wiring itself. This is a self-operating unit, it will decipher and clean up the audio signal on its own. One of the better signal cleaning units on the market. The price is more than fair.