Sub woofer / wooofer?? Please help
 

I live in New Zealand and have a 1998 Audi A3 1.8T which not to my liking came with an after market cd player. which means the cd stacker does not work etc etc. I was looking around the car when i found this sub woofer/woofer with an amp and cross over sitting inside the left panel in the boot. Now my question is , can anybody tell me how to wire this up. I have tried but came up with nothing. I have got it to work but it does not sound right so im guesing i am doing something wrong. Any help would be highly apprecited..... thanks. I am still trying to attach photos. does anyone know how to???