try searching, i know it has been talked about quite a bit. you will have to buy an adapter. i have never done it, so i can't give you exact details, but i know others have and it has been talked about before. good luck.
i know some people just use a deep cycle battery and set a battery charger on it to power the amp. you could also buy a power converter, but they can get expensive, especially one to power an amplifier. try a search on google to try and find prices for a power converter.