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Okay let me clarify this... You listen to FM radio all the time, and cannot find a good USB FM radio antenna, so You want to hook the car's original HU to your computer, so you can still have sounds from your computer, for mp3's and what not, and when you are not listening to those, you listen to the stock radio. Okay, that Or, say you have a navigation system with voice guidance, and you want it to 'lower' the volume on the stock system. You take the outputs from the stock HU (the ones to FR FL RR RL speakers, and hook those onto a headphone jack, and plug that into line in, and take the line out, and hook it to an amp, then to the factory wires, so that the FR, FL, RR, RL speakers get powered, and then you can have both worlds..
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