My friend and I have decided to build a sound system for our get togethers. But we don't want just some home theater system. We want to build our own, using car speakers. Our only dilemma is powering them. We thought we could just power it all with car amplifiers if we could convert the power from 110 volts to 12 volts. However, I cannot find the right converter for such a thing. If someone can help me find the right converter or come up with a different idea on how to power everything, please let me know. Thanks!