I am pretty sure all the drivers are supposed to be active.
If you've got some material that includes content under ~100Hz on at a decent volume, then you should be able to see/feel that each driver is moving.
I definitely would try different listening modes on your receiver, too. And make it as simple as possible ("pure direct" mode or similar). Turn Audyssey off. Even though you are sure you have them set to full range, try to take as many variables out of the equation as possible.
While it is miles better than my old Denon, I still find my Onkyo 805 to be "complicated". And I don't think I'm a technophobe or technotard. There's just a lot of stuff going on there that could be part of your discontent.
Is it all sources? That is, no difference between CD's, TV, etc?
I sympathize with you.
