radio shack, any store seems to get this question since they seemed to know exactly what i was talkin about,amplifire, and horn fused w/ discman.run wire from discman 2 amp from amp 2 horn, buy pred. discs from various sights, and you have a jon stewart type call for 1/2 the price. dont be scared to tell the radio shack geek what u r building and they will help u out .