The Mégane II Owners' Club

Hi guys, I own a Mégane Dynamique 5dr 1.4 16v, I own a set of Fusion PowerPlant 6x9" (http://www.autoneeds.co.uk/index.php?product_id=813352&option=Prod_detail)

Is there any possible way for me to connect these to the back speakers so then I can place them on the parcel shelf?

Thanks for your help.

Ill check out the rear door removal thing. Thanks for your help.

I already have a Sub & Amp fitting though? Would this really matter?