Share 'subwoofer under the dashboard'

My car is a passion coupe turbo 2009. I'm planning to install a subwoofer, and have gone through the forums but haven't found much info. It comes with the radio 9, with aux port. I already installed Sirius radio, placing the antenna under the hood and the radio inside the glove compartment, and using an additional hidden lighter socket, under the dashboard connected to the stock lighter to give i…