If the sub has a built in amp, you probably have to hook that up to a 12volt supply, and you won't find that in your house. The radio could have a sub output in the back and you would connect the RCA cable to that and the sub's power to your battery. Take note I have never added a sub to a car, and I probably don't know what I am talking about, but I find it hard to believe that RCA port would carry the power you need and I imagine it takes a bit of effort to hide the wires and patch it into your radio.
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