OK, your receiver has sound calibration, so you need to get into the menu, set your mains to small (if an option), crank up the sub gain in the receiver, set the Sony crossover to 80Hz for now, AND turn your sub gain down all the way.
Playing your favorite rave or rap cd (oh dear), turn the gain up on the sub till you feel and hear bass. If this doesn't work, I'm on my way with a Mossburg 500 pump, and an Onkyo 605. The 12 gauge is for your sony the Onkyo is to replace it
![Eek! :eek: :eek:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)