i have a new punto with punto blaupunkt head unit. Just fitted jbl 6x9 in rear but wanna add sub. does anyone know if the head unit will run a pre amp sub? if not any ideas??

hi i have the new punto aswell wiv the cd blankpunkt head unit and i was goin to fit a amp and sub but when i took the headunit out it didnt have any phono leads so u got to connect ur amp wiv the rear speakers.