Alrighty, I stand corrected, it would seem I do have a sub woofer under the center console. I did as suggested here and pushed the bass all the way up on the EQ and then FADER'd all the way back to the back seats. And there is no bass in those back seat door speakers, at all. Moved the fader forward and started noticing BASS! Switched to a station that had some house music with lots of thumb in it. Cranked the volume half way and there be BASS! Lol. I put my hands around the center console and definitely felt the bass coming through, not to mention hearing it in the center of the truck. Guess my problem is that I listen to more country or heavy metal music than bass oriented music, which usually doesn't require heavy bass. And usually I drive with the wife so I don't usually crank it so loud with her in the truck. So I am fine with this discovery. Thanks to all who contributed to my (madness) resolution. Raven, Poppi & Kentrucky TB, thanks for the suggestion! that came to this conclusion.