The subs I mentioned are real subs. They both play down to around 45hz. They just don't put out a lot of spl, which I figured would be fine, since I prefer sound quality over loud and the Ranger cab is small.
I've got the rest of the system covered:
Alpine 9827 headunit, JL Audio 300/4 amp and CDT CL-61 components for the front doors.
I've got a 10" sub, in a box from my old vehicle, but I'm trying to save some room behind the seats.