How do you hook up amps and subwoofers to a factory radio?
The best way to connect it to a factory system is to tap into the stereo’s speaker outputs for the amp’s input signal. Then send the amp’s outputs back to the stereo’s harness, and on to the speakers through the factory wiring.
What do you need to hook up a sub to a factory radio?
Use a Converter
You will need a line output converter if you have a factory car stereo in your car. This is because the factory head unit generally tends to have speaker wires but does not have a preamp output that can convert them into RCA signals.
How do I connect my subwoofer to my car stereo with an amp?
Connect the left channel on the subwoofer to the left channel on the amplifier and the right channel on the subwoofer to the right channel on the amplifier. If there is a separate power cord for the sub, you may need to attach this to the amp as well.