if you have a cassette you don't have premium sound. Or at least i do not think so. If you have the cd player then it has the external amp. My car had cassette and it doesn't have premium sound so no amp. hope that helps


- 95 Mystique LS - Zetec/5spd - 99 Contour SeVT Sport - Duratec/5spd Official NE-CEG Contour/Mustang Family