I just bought a new system: PA D5000.5 Amp, MM6501 speakers and MM10DVC Sub. My question is where should I put the sub for best sound quality. As far as I can figure it out, the basic choices I have are behind either the driver or passenger the front seat in a thin crew cab type enclosure or in the back behind the rear seats in a more squared off box. I have a 1998 Subaru Outback station wagon. Any input would be appreciated.