I used a rechargable car battery booster as my power, I used a portable CD player as my signal,and took headphone wire and cut them then i took rca jacks from like a playstation and wired it to the head phone jack then pluged it into the amp hooked up a 12 inch jbl in a bandpass enclosure and i bet i hit harder then some poeples cars.
My friend used to do that with a battery in the mix, well it exploded one day and he got acid all over his face and in his eyes.... So have fun with that and tell me how it goes!