The best way to connect it to a factory system is to tap into the stereos speaker outputs for the amps input signal. Then send the amps outputs back to the stereos harness, and on to the speakers through the factory wiring.

Can you hook up subs to a factory radio?

It takes the hi-level signals of your factory amp and drops them down to the line level that your amplifier needs – all without compromising the fidelity of the factory system. So now you know – its definitely possible to install a subwoofer and amplifier to your factory system, and still have it sounding good.