C30 Rear Speaker Access
 

I am attempting to install an amp and woofer into my 2009 C30 T5 R-Design. I am planning on splicing into the rear speakers and sending the signal to the amp but I can't figure out how to access the rear speakers. I was able to get the cover off exposing the seat belt coiling system but not any further. I don't want to risk breaking something. Can someone please help me out or point me in the direction of someone that could?
Thanks.