OverLord669

I bought a head unit designed to fit my w203 with sat nav and DVD player, it also has a sub volume control, but my c180 doesn't have a sub so I bought a mercedes factory duel coil one, as all the fixtures will be in my car or so I thought, when I go to fit it there are no sub wires, are there any? and is the sub powered by the head unit or an amp via phono, can anyone help