You need a power converter. One that converts 120 volt to 12 volt. You can get them at places like Radio Shack or other electronic stores. Same way you can buy a inverter to convert your 12 volt car current to run a 120 volt appliance like a laptop or such. I have one in my truck for electonics (120 volt).
you have to use a 110 ac converter to 12 volt dc. then you can use car audio equipment in you home